[PATCHSET] block: per-queue policy activation, take#2

[PATCHSET] block: per-queue policy activation, take#2

[Tejun Heo]

Hello,

Upto now, blkcg assumed that all policies are active on all queues
which simply isn't true - cfq policy is only applicable to queues
which are using cfq as the elevator.  Also, for transition purposes,
the current implementation clears all !root blkgs blkgs across
elevator switch and policy [de]registration in racy manner.

This patchset implements per-queue policy activation.  Static policy
ID is replaced with dynamic registration and each policy should be
activated and deactivated explicitly on each queue.  On activation,
the matching policy data are created on all existing blkgs.  On
deactivation, the matching policy data are removed from all existing
blkgs.  blkg printing skips blkg-policy combination which is disabled
and trying to configure a policy on a blkg which doesn't have the
policy enabled would return -EINVAL instead of creating an unused
dummy configuration.

Changes from the last take[L] are

* 0001 to fix config dependent build error / warnings added.

* More comments added to 0006 as suggested by Vivek.

* 0007 added to avoid boot time bypass delays.

* 0009 made cfq_init_queue() return garbage after alloc failure if
  !CONFIG_CFQ_GROUP_IOSCHED.  Fixed.

* 0011 which shoots down all blkgs if no policy is activated added.
  Suggested by Vivek.

 0001-cfq-fix-build-breakage-warnings.patch
 0002-blkcg-kill-blkio_list-and-replace-blkio_list_lock-wi.patch
 0003-blkcg-use-pol-instead-of-plid-in-update_root_blkg_pd.patch
 0004-blkcg-remove-static-policy-ID-enums.patch
 0005-blkcg-make-blkg_conf_prep-take-pol-and-return-with-q.patch
 0006-blkcg-make-sure-blkg_lookup-returns-NULL-if-q-is-byp.patch
 0007-blkcg-make-request_queue-bypassing-on-allocation.patch
 0008-blkcg-add-request_queue-root_blkg.patch
 0009-blkcg-implement-per-queue-policy-activation.patch
 0010-blkcg-drop-stuff-unused-after-per-queue-policy-activ.patch
 0011-blkcg-shoot-down-blkgs-if-all-policies-are-deactivat.patch

This patchset is on top of the current block/for-3.5/core 5bc4afb1ec
"blkcg: drop BLKCG_STAT_{PRIV|POL|OFF} macros" and also available in
the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-pols

diffstat follows.

 block/blk-cgroup.c     |  424 ++++++++++++++++++++++++++++++-------------------
 block/blk-cgroup.h     |   43 ++--
 block/blk-core.c       |    4 
 block/blk-throttle.c   |   78 +++------
 block/cfq-iosched.c    |   71 ++++----
 block/elevator.c       |    2 
 include/linux/blkdev.h |   10 +
 7 files changed, 367 insertions(+), 265 deletions(-)

Thanks.

--
tejun

[L] http://thread.gmane.org/gmane.linux.kernel.cgroups/1641

[PATCH 01/11] cfq: fix build breakage & warnings

[Tejun Heo]

* CFQ_WEIGHT_* defined inside CONFIG_BLK_CGROUP causes cfq-iosched.c
  compile failure when the config is disabled.  Move it outside the
  ifdef block.

* Dummy cfqg_stats_*() definitions were lacking inline modifiers
  causing unused functions warning if !CONFIG_CFQ_GROUP_IOSCHED.  Add
  them.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.h  |    4 ++--
 block/cfq-iosched.c |   17 ++++++++---------
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index ca0ff7c..64392ac 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -27,13 +27,13 @@ enum blkio_policy_id {
 /* Max limits for throttle policy */
 #define THROTL_IOPS_MAX		UINT_MAX
 
-#ifdef CONFIG_BLK_CGROUP
-
 /* CFQ specific, out here for blkcg->cfq_weight */
 #define CFQ_WEIGHT_MIN		10
 #define CFQ_WEIGHT_MAX		1000
 #define CFQ_WEIGHT_DEFAULT	500
 
+#ifdef CONFIG_BLK_CGROUP
+
 enum blkg_rwstat_type {
 	BLKG_RWSTAT_READ,
 	BLKG_RWSTAT_WRITE,
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index cff8b5b..7a8c3e0 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -17,7 +17,7 @@
 #include "blk.h"
 #include "blk-cgroup.h"
 
-static struct blkio_policy_type blkio_policy_cfq;
+static struct blkio_policy_type blkio_policy_cfq __maybe_unused;
 
 /*
  * tunables
@@ -541,14 +541,13 @@ static void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg)
 
 #else	/* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */
 
-static void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg,
-						 struct cfq_group *curr_cfqg) { }
-static void cfqg_stats_end_empty_time(struct cfqg_stats *stats) { }
-static void cfqg_stats_update_dequeue(struct cfq_group *cfqg) { }
-static void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) { }
-static void cfqg_stats_update_idle_time(struct cfq_group *cfqg) { }
-static void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) { }
-static void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_set_start_group_wait_time(struct cfq_group *cfqg, struct cfq_group *curr_cfqg) { }
+static inline void cfqg_stats_end_empty_time(struct cfqg_stats *stats) { }
+static inline void cfqg_stats_update_dequeue(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_set_start_empty_time(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_update_idle_time(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_set_start_idle_time(struct cfq_group *cfqg) { }
+static inline void cfqg_stats_update_avg_queue_size(struct cfq_group *cfqg) { }
 
 #endif	/* CONFIG_CFQ_GROUP_IOSCHED && CONFIG_DEBUG_BLK_CGROUP */
 
-- 
1.7.7.3

[PATCH 02/11] blkcg: kill blkio_list and replace blkio_list_lock with a mutex

[Tejun Heo]

With blkio_policy[], blkio_list is redundant and hinders with
per-queue policy activation.  Remove it.  Also, replace
blkio_list_lock with a mutex blkcg_pol_mutex and let it protect the
whole [un]registration.

This is to prepare for per-queue policy activation and doesn't cause
any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c |   32 +++++++++++++++++---------------
 block/blk-cgroup.h |    1 -
 2 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 9449c38..af665fe 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -24,9 +24,7 @@
 
 #define MAX_KEY_LEN 100
 
-static DEFINE_SPINLOCK(blkio_list_lock);
-static LIST_HEAD(blkio_list);
-
+static DEFINE_MUTEX(blkcg_pol_mutex);
 static DEFINE_MUTEX(all_q_mutex);
 static LIST_HEAD(all_q_list);
 
@@ -311,8 +309,9 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
 	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);
 	struct blkio_group *blkg;
 	struct hlist_node *n;
+	int i;
 
-	spin_lock(&blkio_list_lock);
+	mutex_lock(&blkcg_pol_mutex);
 	spin_lock_irq(&blkcg->lock);
 
 	/*
@@ -321,15 +320,16 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
 	 * anyway.  If you get hit by a race, retry.
 	 */
 	hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
-		struct blkio_policy_type *pol;
+		for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+			struct blkio_policy_type *pol = blkio_policy[i];
 
-		list_for_each_entry(pol, &blkio_list, list)
-			if (pol->ops.blkio_reset_group_stats_fn)
+			if (pol && pol->ops.blkio_reset_group_stats_fn)
 				pol->ops.blkio_reset_group_stats_fn(blkg);
+		}
 	}
 
 	spin_unlock_irq(&blkcg->lock);
-	spin_unlock(&blkio_list_lock);
+	mutex_unlock(&blkcg_pol_mutex);
 	return 0;
 }
 
@@ -732,20 +732,21 @@ void blkio_policy_register(struct blkio_policy_type *blkiop)
 {
 	struct request_queue *q;
 
+	mutex_lock(&blkcg_pol_mutex);
+
 	blkcg_bypass_start();
-	spin_lock(&blkio_list_lock);
 
 	BUG_ON(blkio_policy[blkiop->plid]);
 	blkio_policy[blkiop->plid] = blkiop;
-	list_add_tail(&blkiop->list, &blkio_list);
-
-	spin_unlock(&blkio_list_lock);
 	list_for_each_entry(q, &all_q_list, all_q_node)
 		update_root_blkg_pd(q, blkiop->plid);
+
 	blkcg_bypass_end();
 
 	if (blkiop->cftypes)
 		WARN_ON(cgroup_add_cftypes(&blkio_subsys, blkiop->cftypes));
+
+	mutex_unlock(&blkcg_pol_mutex);
 }
 EXPORT_SYMBOL_GPL(blkio_policy_register);
 
@@ -753,19 +754,20 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop)
 {
 	struct request_queue *q;
 
+	mutex_lock(&blkcg_pol_mutex);
+
 	if (blkiop->cftypes)
 		cgroup_rm_cftypes(&blkio_subsys, blkiop->cftypes);
 
 	blkcg_bypass_start();
-	spin_lock(&blkio_list_lock);
 
 	BUG_ON(blkio_policy[blkiop->plid] != blkiop);
 	blkio_policy[blkiop->plid] = NULL;
-	list_del_init(&blkiop->list);
 
-	spin_unlock(&blkio_list_lock);
 	list_for_each_entry(q, &all_q_list, all_q_node)
 		update_root_blkg_pd(q, blkiop->plid);
 	blkcg_bypass_end();
+
+	mutex_unlock(&blkcg_pol_mutex);
 }
 EXPORT_SYMBOL_GPL(blkio_policy_unregister);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 64392ac..c772581 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -102,7 +102,6 @@ struct blkio_policy_ops {
 };
 
 struct blkio_policy_type {
-	struct list_head list;
 	struct blkio_policy_ops ops;
 	enum blkio_policy_id plid;
 	size_t pdata_size;		/* policy specific private data size */
-- 
1.7.7.3

[PATCH 03/11] blkcg: use @pol instead of @plid in update_root_blkg_pd() and blkcg_print_blkgs()

[Tejun Heo]

The two functions were taking "enum blkio_policy_id plid".  Make them
take "const struct blkio_policy_type *pol" instead.

This is to prepare for per-queue policy activation and doesn't cause
any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c   |   21 +++++++++++----------
 block/blk-cgroup.h   |    7 ++++---
 block/blk-throttle.c |    6 +++---
 block/cfq-iosched.c  |   10 +++++-----
 4 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index af665fe..b123152 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -226,17 +226,17 @@ static void blkg_destroy(struct blkio_group *blkg)
  * aren't shot down.  This broken and racy implementation is temporary.
  * Eventually, blkg shoot down will be replaced by proper in-place update.
  */
-void update_root_blkg_pd(struct request_queue *q, enum blkio_policy_id plid)
+void update_root_blkg_pd(struct request_queue *q,
+			 const struct blkio_policy_type *pol)
 {
-	struct blkio_policy_type *pol = blkio_policy[plid];
 	struct blkio_group *blkg = blkg_lookup(&blkio_root_cgroup, q);
 	struct blkg_policy_data *pd;
 
 	if (!blkg)
 		return;
 
-	kfree(blkg->pd[plid]);
-	blkg->pd[plid] = NULL;
+	kfree(blkg->pd[pol->plid]);
+	blkg->pd[pol->plid] = NULL;
 
 	if (!pol)
 		return;
@@ -244,7 +244,7 @@ void update_root_blkg_pd(struct request_queue *q, enum blkio_policy_id plid)
 	pd = kzalloc(sizeof(*pd) + pol->pdata_size, GFP_KERNEL);
 	WARN_ON_ONCE(!pd);
 
-	blkg->pd[plid] = pd;
+	blkg->pd[pol->plid] = pd;
 	pd->blkg = blkg;
 	pol->ops.blkio_init_group_fn(blkg);
 }
@@ -360,7 +360,8 @@ static const char *blkg_dev_name(struct blkio_group *blkg)
  */
 void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
 		       u64 (*prfill)(struct seq_file *, void *, int),
-		       int pol, int data, bool show_total)
+		       const struct blkio_policy_type *pol, int data,
+		       bool show_total)
 {
 	struct blkio_group *blkg;
 	struct hlist_node *n;
@@ -368,8 +369,8 @@ void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
 
 	spin_lock_irq(&blkcg->lock);
 	hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
-		if (blkg->pd[pol])
-			total += prfill(sf, blkg->pd[pol]->pdata, data);
+		if (blkg->pd[pol->plid])
+			total += prfill(sf, blkg->pd[pol->plid]->pdata, data);
 	spin_unlock_irq(&blkcg->lock);
 
 	if (show_total)
@@ -739,7 +740,7 @@ void blkio_policy_register(struct blkio_policy_type *blkiop)
 	BUG_ON(blkio_policy[blkiop->plid]);
 	blkio_policy[blkiop->plid] = blkiop;
 	list_for_each_entry(q, &all_q_list, all_q_node)
-		update_root_blkg_pd(q, blkiop->plid);
+		update_root_blkg_pd(q, blkiop);
 
 	blkcg_bypass_end();
 
@@ -765,7 +766,7 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop)
 	blkio_policy[blkiop->plid] = NULL;
 
 	list_for_each_entry(q, &all_q_list, all_q_node)
-		update_root_blkg_pd(q, blkiop->plid);
+		update_root_blkg_pd(q, blkiop);
 	blkcg_bypass_end();
 
 	mutex_unlock(&blkcg_pol_mutex);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index c772581..2694973 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -117,11 +117,12 @@ extern void blkio_policy_register(struct blkio_policy_type *);
 extern void blkio_policy_unregister(struct blkio_policy_type *);
 extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
 extern void update_root_blkg_pd(struct request_queue *q,
-				enum blkio_policy_id plid);
+				const struct blkio_policy_type *pol);
 
 void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
 		       u64 (*prfill)(struct seq_file *, void *, int),
-		       int pol, int data, bool show_total);
+		       const struct blkio_policy_type *pol, int data,
+		       bool show_total);
 u64 __blkg_prfill_u64(struct seq_file *sf, void *pdata, u64 v);
 u64 __blkg_prfill_rwstat(struct seq_file *sf, void *pdata,
 			 const struct blkg_rwstat *rwstat);
@@ -333,7 +334,7 @@ static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
 static inline void blkg_destroy_all(struct request_queue *q,
 				    bool destory_root) { }
 static inline void update_root_blkg_pd(struct request_queue *q,
-				       enum blkio_policy_id plid) { }
+				       const struct blkio_policy_type *pol) { }
 
 static inline void *blkg_to_pdata(struct blkio_group *blkg,
 				struct blkio_policy_type *pol) { return NULL; }
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 6024014..07c17c2 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -946,7 +946,7 @@ static int tg_print_cpu_rwstat(struct cgroup *cgrp, struct cftype *cft,
 {
 	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
 
-	blkcg_print_blkgs(sf, blkcg, tg_prfill_cpu_rwstat, BLKIO_POLICY_THROTL,
+	blkcg_print_blkgs(sf, blkcg, tg_prfill_cpu_rwstat, &blkio_policy_throtl,
 			  cft->private, true);
 	return 0;
 }
@@ -973,7 +973,7 @@ static int tg_print_conf_u64(struct cgroup *cgrp, struct cftype *cft,
 			     struct seq_file *sf)
 {
 	blkcg_print_blkgs(sf, cgroup_to_blkio_cgroup(cgrp), tg_prfill_conf_u64,
-			  BLKIO_POLICY_THROTL, cft->private, false);
+			  &blkio_policy_throtl, cft->private, false);
 	return 0;
 }
 
@@ -981,7 +981,7 @@ static int tg_print_conf_uint(struct cgroup *cgrp, struct cftype *cft,
 			      struct seq_file *sf)
 {
 	blkcg_print_blkgs(sf, cgroup_to_blkio_cgroup(cgrp), tg_prfill_conf_uint,
-			  BLKIO_POLICY_THROTL, cft->private, false);
+			  &blkio_policy_throtl, cft->private, false);
 	return 0;
 }
 
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 7a8c3e0..d02f0ae 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1380,7 +1380,7 @@ static int cfqg_print_weight_device(struct cgroup *cgrp, struct cftype *cft,
 				    struct seq_file *sf)
 {
 	blkcg_print_blkgs(sf, cgroup_to_blkio_cgroup(cgrp),
-			  cfqg_prfill_weight_device, BLKIO_POLICY_PROP, 0,
+			  cfqg_prfill_weight_device, &blkio_policy_cfq, 0,
 			  false);
 	return 0;
 }
@@ -1445,7 +1445,7 @@ static int cfqg_print_stat(struct cgroup *cgrp, struct cftype *cft,
 {
 	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
 
-	blkcg_print_blkgs(sf, blkcg, blkg_prfill_stat, BLKIO_POLICY_PROP,
+	blkcg_print_blkgs(sf, blkcg, blkg_prfill_stat, &blkio_policy_cfq,
 			  cft->private, false);
 	return 0;
 }
@@ -1455,7 +1455,7 @@ static int cfqg_print_rwstat(struct cgroup *cgrp, struct cftype *cft,
 {
 	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
 
-	blkcg_print_blkgs(sf, blkcg, blkg_prfill_rwstat, BLKIO_POLICY_PROP,
+	blkcg_print_blkgs(sf, blkcg, blkg_prfill_rwstat, &blkio_policy_cfq,
 			  cft->private, true);
 	return 0;
 }
@@ -1482,7 +1482,7 @@ static int cfqg_print_avg_queue_size(struct cgroup *cgrp, struct cftype *cft,
 	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
 
 	blkcg_print_blkgs(sf, blkcg, cfqg_prfill_avg_queue_size,
-			  BLKIO_POLICY_PROP, 0, false);
+			  &blkio_policy_cfq, 0, false);
 	return 0;
 }
 #endif	/* CONFIG_DEBUG_BLK_CGROUP */
@@ -3938,7 +3938,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
 #ifndef CONFIG_CFQ_GROUP_IOSCHED
 	kfree(cfqd->root_group);
 #endif
-	update_root_blkg_pd(q, BLKIO_POLICY_PROP);
+	update_root_blkg_pd(q, &blkio_policy_cfq);
 	kfree(cfqd);
 }
 
-- 
1.7.7.3

[PATCH 04/11] blkcg: remove static policy ID enums

[Tejun Heo]

Remove BLKIO_POLICY_* enums and let blkio_policy_register() allocate
@pol->plid dynamically on registration.  The maximum number of blkcg
policies which can be registered at the same time is defined by
BLKCG_MAX_POLS constant added to include/linux/blkdev.h.

Note that blkio_policy_register() now may fail.  Policy init functions
updated accordingly and unnecessary ifdefs removed from cfq_init().

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c     |   59 +++++++++++++++++++++++++++++++++++------------
 block/blk-cgroup.h     |   15 +++---------
 block/blk-throttle.c   |    4 +--
 block/cfq-iosched.c    |   25 +++++++++++---------
 include/linux/blkdev.h |    7 +++++-
 5 files changed, 69 insertions(+), 41 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index b123152..2d4d7d6 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -31,7 +31,7 @@ static LIST_HEAD(all_q_list);
 struct blkio_cgroup blkio_root_cgroup = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT };
 EXPORT_SYMBOL_GPL(blkio_root_cgroup);
 
-static struct blkio_policy_type *blkio_policy[BLKIO_NR_POLICIES];
+static struct blkio_policy_type *blkio_policy[BLKCG_MAX_POLS];
 
 struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
 {
@@ -67,7 +67,7 @@ static void blkg_free(struct blkio_group *blkg)
 	if (!blkg)
 		return;
 
-	for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+	for (i = 0; i < BLKCG_MAX_POLS; i++) {
 		struct blkio_policy_type *pol = blkio_policy[i];
 		struct blkg_policy_data *pd = blkg->pd[i];
 
@@ -107,7 +107,7 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 	blkg->refcnt = 1;
 	cgroup_path(blkcg->css.cgroup, blkg->path, sizeof(blkg->path));
 
-	for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+	for (i = 0; i < BLKCG_MAX_POLS; i++) {
 		struct blkio_policy_type *pol = blkio_policy[i];
 		struct blkg_policy_data *pd;
 
@@ -127,7 +127,7 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 	}
 
 	/* invoke per-policy init */
-	for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+	for (i = 0; i < BLKCG_MAX_POLS; i++) {
 		struct blkio_policy_type *pol = blkio_policy[i];
 
 		if (pol)
@@ -320,7 +320,7 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
 	 * anyway.  If you get hit by a race, retry.
 	 */
 	hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
-		for (i = 0; i < BLKIO_NR_POLICIES; i++) {
+		for (i = 0; i < BLKCG_MAX_POLS; i++) {
 			struct blkio_policy_type *pol = blkio_policy[i];
 
 			if (pol && pol->ops.blkio_reset_group_stats_fn)
@@ -729,46 +729,75 @@ struct cgroup_subsys blkio_subsys = {
 };
 EXPORT_SYMBOL_GPL(blkio_subsys);
 
-void blkio_policy_register(struct blkio_policy_type *blkiop)
+/**
+ * blkio_policy_register - register a blkcg policy
+ * @blkiop: blkcg policy to register
+ *
+ * Register @blkiop with blkcg core.  Might sleep and @blkiop may be
+ * modified on successful registration.  Returns 0 on success and -errno on
+ * failure.
+ */
+int blkio_policy_register(struct blkio_policy_type *blkiop)
 {
 	struct request_queue *q;
+	int i, ret;
 
 	mutex_lock(&blkcg_pol_mutex);
 
-	blkcg_bypass_start();
+	/* find an empty slot */
+	ret = -ENOSPC;
+	for (i = 0; i < BLKCG_MAX_POLS; i++)
+		if (!blkio_policy[i])
+			break;
+	if (i >= BLKCG_MAX_POLS)
+		goto out_unlock;
 
-	BUG_ON(blkio_policy[blkiop->plid]);
-	blkio_policy[blkiop->plid] = blkiop;
+	/* register and update blkgs */
+	blkiop->plid = i;
+	blkio_policy[i] = blkiop;
+
+	blkcg_bypass_start();
 	list_for_each_entry(q, &all_q_list, all_q_node)
 		update_root_blkg_pd(q, blkiop);
-
 	blkcg_bypass_end();
 
+	/* everything is in place, add intf files for the new policy */
 	if (blkiop->cftypes)
 		WARN_ON(cgroup_add_cftypes(&blkio_subsys, blkiop->cftypes));
-
+	ret = 0;
+out_unlock:
 	mutex_unlock(&blkcg_pol_mutex);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(blkio_policy_register);
 
+/**
+ * blkiop_policy_unregister - unregister a blkcg policy
+ * @blkiop: blkcg policy to unregister
+ *
+ * Undo blkio_policy_register(@blkiop).  Might sleep.
+ */
 void blkio_policy_unregister(struct blkio_policy_type *blkiop)
 {
 	struct request_queue *q;
 
 	mutex_lock(&blkcg_pol_mutex);
 
+	if (WARN_ON(blkio_policy[blkiop->plid] != blkiop))
+		goto out_unlock;
+
+	/* kill the intf files first */
 	if (blkiop->cftypes)
 		cgroup_rm_cftypes(&blkio_subsys, blkiop->cftypes);
 
-	blkcg_bypass_start();
-
-	BUG_ON(blkio_policy[blkiop->plid] != blkiop);
+	/* unregister and update blkgs */
 	blkio_policy[blkiop->plid] = NULL;
 
+	blkcg_bypass_start();
 	list_for_each_entry(q, &all_q_list, all_q_node)
 		update_root_blkg_pd(q, blkiop);
 	blkcg_bypass_end();
-
+out_unlock:
 	mutex_unlock(&blkcg_pol_mutex);
 }
 EXPORT_SYMBOL_GPL(blkio_policy_unregister);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 2694973..be80d6e 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -17,13 +17,6 @@
 #include <linux/u64_stats_sync.h>
 #include <linux/seq_file.h>
 
-enum blkio_policy_id {
-	BLKIO_POLICY_PROP = 0,		/* Proportional Bandwidth division */
-	BLKIO_POLICY_THROTL,		/* Throttling */
-
-	BLKIO_NR_POLICIES,
-};
-
 /* Max limits for throttle policy */
 #define THROTL_IOPS_MAX		UINT_MAX
 
@@ -86,7 +79,7 @@ struct blkio_group {
 	/* reference count */
 	int refcnt;
 
-	struct blkg_policy_data *pd[BLKIO_NR_POLICIES];
+	struct blkg_policy_data *pd[BLKCG_MAX_POLS];
 
 	struct rcu_head rcu_head;
 };
@@ -103,7 +96,7 @@ struct blkio_policy_ops {
 
 struct blkio_policy_type {
 	struct blkio_policy_ops ops;
-	enum blkio_policy_id plid;
+	int plid;
 	size_t pdata_size;		/* policy specific private data size */
 	struct cftype *cftypes;		/* cgroup files for the policy */
 };
@@ -113,7 +106,7 @@ extern void blkcg_drain_queue(struct request_queue *q);
 extern void blkcg_exit_queue(struct request_queue *q);
 
 /* Blkio controller policy registration */
-extern void blkio_policy_register(struct blkio_policy_type *);
+extern int blkio_policy_register(struct blkio_policy_type *);
 extern void blkio_policy_unregister(struct blkio_policy_type *);
 extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
 extern void update_root_blkg_pd(struct request_queue *q,
@@ -329,7 +322,7 @@ struct blkio_policy_type {
 static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
 static inline void blkcg_drain_queue(struct request_queue *q) { }
 static inline void blkcg_exit_queue(struct request_queue *q) { }
-static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
+static inline int blkio_policy_register(struct blkio_policy_type *blkiop) { return 0; }
 static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
 static inline void blkg_destroy_all(struct request_queue *q,
 				    bool destory_root) { }
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 07c17c2..0dc4645 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1089,7 +1089,6 @@ static struct blkio_policy_type blkio_policy_throtl = {
 		.blkio_exit_group_fn = throtl_exit_blkio_group,
 		.blkio_reset_group_stats_fn = throtl_reset_group_stats,
 	},
-	.plid = BLKIO_POLICY_THROTL,
 	.pdata_size = sizeof(struct throtl_grp),
 	.cftypes = throtl_files,
 };
@@ -1271,8 +1270,7 @@ static int __init throtl_init(void)
 	if (!kthrotld_workqueue)
 		panic("Failed to create kthrotld\n");
 
-	blkio_policy_register(&blkio_policy_throtl);
-	return 0;
+	return blkio_policy_register(&blkio_policy_throtl);
 }
 
 module_init(throtl_init);
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d02f0ae..08db2fc 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -4157,7 +4157,6 @@ static struct blkio_policy_type blkio_policy_cfq = {
 		.blkio_init_group_fn =		cfq_init_blkio_group,
 		.blkio_reset_group_stats_fn =	cfqg_stats_reset,
 	},
-	.plid = BLKIO_POLICY_PROP,
 	.pdata_size = sizeof(struct cfq_group),
 	.cftypes = cfq_blkcg_files,
 };
@@ -4181,27 +4180,31 @@ static int __init cfq_init(void)
 #else
 		cfq_group_idle = 0;
 #endif
+
+	ret = blkio_policy_register(&blkio_policy_cfq);
+	if (ret)
+		return ret;
+
 	cfq_pool = KMEM_CACHE(cfq_queue, 0);
 	if (!cfq_pool)
-		return -ENOMEM;
+		goto err_pol_unreg;
 
 	ret = elv_register(&iosched_cfq);
-	if (ret) {
-		kmem_cache_destroy(cfq_pool);
-		return ret;
-	}
+	if (ret)
+		goto err_free_pool;
 
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
-	blkio_policy_register(&blkio_policy_cfq);
-#endif
 	return 0;
+
+err_free_pool:
+	kmem_cache_destroy(cfq_pool);
+err_pol_unreg:
+	blkio_policy_unregister(&blkio_policy_cfq);
+	return ret;
 }
 
 static void __exit cfq_exit(void)
 {
-#ifdef CONFIG_CFQ_GROUP_IOSCHED
 	blkio_policy_unregister(&blkio_policy_cfq);
-#endif
 	elv_unregister(&iosched_cfq);
 	kmem_cache_destroy(cfq_pool);
 }
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 33f1b29..d2c69f8 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -35,6 +35,12 @@ struct bsg_job;
 #define BLKDEV_MIN_RQ	4
 #define BLKDEV_MAX_RQ	128	/* Default maximum */
 
+/*
+ * Maximum number of blkcg policies allowed to be registered concurrently.
+ * Defined here to simplify include dependency.
+ */
+#define BLKCG_MAX_POLS		2
+
 struct request;
 typedef void (rq_end_io_fn)(struct request *, int);
 
@@ -363,7 +369,6 @@ struct request_queue {
 
 	struct list_head	icq_list;
 #ifdef CONFIG_BLK_CGROUP
-	/* XXX: array size hardcoded to avoid include dependency (temporary) */
 	struct list_head	blkg_list;
 #endif
 
-- 
1.7.7.3

[PATCH 05/11] blkcg: make blkg_conf_prep() take @pol and return with queue lock held

[Tejun Heo]

Add @pol to blkg_conf_prep() and let it return with queue lock held
(to be released by blkg_conf_finish()).  Note that @pol isn't used
yet.

This is to prepare for per-queue policy activation and doesn't cause
any visible difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c   |   17 ++++++++++-------
 block/blk-cgroup.h   |    3 ++-
 block/blk-throttle.c |    2 +-
 block/cfq-iosched.c  |    2 +-
 4 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 2d4d7d6..f6581a0 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -464,17 +464,19 @@ EXPORT_SYMBOL_GPL(blkg_prfill_rwstat);
 /**
  * blkg_conf_prep - parse and prepare for per-blkg config update
  * @blkcg: target block cgroup
+ * @pol: target policy
  * @input: input string
  * @ctx: blkg_conf_ctx to be filled
  *
  * Parse per-blkg config update from @input and initialize @ctx with the
  * result.  @ctx->blkg points to the blkg to be updated and @ctx->v the new
- * value.  This function returns with RCU read locked and must be paired
- * with blkg_conf_finish().
+ * value.  This function returns with RCU read lock and queue lock held and
+ * must be paired with blkg_conf_finish().
  */
-int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input,
+int blkg_conf_prep(struct blkio_cgroup *blkcg,
+		   const struct blkio_policy_type *pol, const char *input,
 		   struct blkg_conf_ctx *ctx)
-	__acquires(rcu)
+	__acquires(rcu) __acquires(disk->queue->queue_lock)
 {
 	struct gendisk *disk;
 	struct blkio_group *blkg;
@@ -490,14 +492,14 @@ int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input,
 		return -EINVAL;
 
 	rcu_read_lock();
-
 	spin_lock_irq(disk->queue->queue_lock);
+
 	blkg = blkg_lookup_create(blkcg, disk->queue, false);
-	spin_unlock_irq(disk->queue->queue_lock);
 
 	if (IS_ERR(blkg)) {
 		ret = PTR_ERR(blkg);
 		rcu_read_unlock();
+		spin_unlock_irq(disk->queue->queue_lock);
 		put_disk(disk);
 		/*
 		 * If queue was bypassing, we should retry.  Do so after a
@@ -527,8 +529,9 @@ EXPORT_SYMBOL_GPL(blkg_conf_prep);
  * with blkg_conf_prep().
  */
 void blkg_conf_finish(struct blkg_conf_ctx *ctx)
-	__releases(rcu)
+	__releases(ctx->disk->queue->queue_lock) __releases(rcu)
 {
+	spin_unlock_irq(ctx->disk->queue->queue_lock);
 	rcu_read_unlock();
 	put_disk(ctx->disk);
 }
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index be80d6e..df1c7b2 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -128,7 +128,8 @@ struct blkg_conf_ctx {
 	u64			v;
 };
 
-int blkg_conf_prep(struct blkio_cgroup *blkcg, const char *input,
+int blkg_conf_prep(struct blkio_cgroup *blkcg,
+		   const struct blkio_policy_type *pol, const char *input,
 		   struct blkg_conf_ctx *ctx);
 void blkg_conf_finish(struct blkg_conf_ctx *ctx);
 
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 0dc4645..6f1bfdf 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -993,7 +993,7 @@ static int tg_set_conf(struct cgroup *cgrp, struct cftype *cft, const char *buf,
 	struct throtl_grp *tg;
 	int ret;
 
-	ret = blkg_conf_prep(blkcg, buf, &ctx);
+	ret = blkg_conf_prep(blkcg, &blkio_policy_throtl, buf, &ctx);
 	if (ret)
 		return ret;
 
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 08db2fc..de95f9a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1400,7 +1400,7 @@ static int cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
 	struct cfq_group *cfqg;
 	int ret;
 
-	ret = blkg_conf_prep(blkcg, buf, &ctx);
+	ret = blkg_conf_prep(blkcg, &blkio_policy_cfq, buf, &ctx);
 	if (ret)
 		return ret;
 
-- 
1.7.7.3

[PATCH 06/11] blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing

[Tejun Heo]

Currently, blkg_lookup() doesn't check @q bypass state.  This patch
updates blk_queue_bypass_start() to do synchronize_rcu() before
returning and updates blkg_lookup() to check blk_queue_bypass() and
return %NULL if bypassing.  This ensures blkg_lookup() returns %NULL
if @q is bypassing.

This is to guarantee that nobody is accessing policy data while @q is
bypassing, which is necessary to allow replacing blkio_cgroup->pd[] in
place on policy [de]activation.

v2: Added more comments explaining bypass guarantees as suggested by
    Vivek.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c |   50 +++++++++++++++++++++++++++++++++-----------------
 block/blk-core.c   |    5 ++++-
 2 files changed, 37 insertions(+), 18 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index f6581a0..d6e4555 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -137,6 +137,38 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 	return blkg;
 }
 
+static struct blkio_group *__blkg_lookup(struct blkio_cgroup *blkcg,
+					 struct request_queue *q)
+{
+	struct blkio_group *blkg;
+	struct hlist_node *n;
+
+	hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node)
+		if (blkg->q == q)
+			return blkg;
+	return NULL;
+}
+
+/**
+ * blkg_lookup - lookup blkg for the specified blkcg - q pair
+ * @blkcg: blkcg of interest
+ * @q: request_queue of interest
+ *
+ * Lookup blkg for the @blkcg - @q pair.  This function should be called
+ * under RCU read lock and is guaranteed to return %NULL if @q is bypassing
+ * - see blk_queue_bypass_start() for details.
+ */
+struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
+				struct request_queue *q)
+{
+	WARN_ON_ONCE(!rcu_read_lock_held());
+
+	if (unlikely(blk_queue_bypass(q)))
+		return NULL;
+	return __blkg_lookup(blkcg, q);
+}
+EXPORT_SYMBOL_GPL(blkg_lookup);
+
 struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 				       struct request_queue *q,
 				       bool for_root)
@@ -150,13 +182,11 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 	/*
 	 * This could be the first entry point of blkcg implementation and
 	 * we shouldn't allow anything to go through for a bypassing queue.
-	 * The following can be removed if blkg lookup is guaranteed to
-	 * fail on a bypassing queue.
 	 */
 	if (unlikely(blk_queue_bypass(q)) && !for_root)
 		return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
 
-	blkg = blkg_lookup(blkcg, q);
+	blkg = __blkg_lookup(blkcg, q);
 	if (blkg)
 		return blkg;
 
@@ -185,20 +215,6 @@ out:
 }
 EXPORT_SYMBOL_GPL(blkg_lookup_create);
 
-/* called under rcu_read_lock(). */
-struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
-				struct request_queue *q)
-{
-	struct blkio_group *blkg;
-	struct hlist_node *n;
-
-	hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node)
-		if (blkg->q == q)
-			return blkg;
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(blkg_lookup);
-
 static void blkg_destroy(struct blkio_group *blkg)
 {
 	struct request_queue *q = blkg->q;
diff --git a/block/blk-core.c b/block/blk-core.c
index 991c1d6..a4b3eaf 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -416,7 +416,8 @@ void blk_drain_queue(struct request_queue *q, bool drain_all)
  * In bypass mode, only the dispatch FIFO queue of @q is used.  This
  * function makes @q enter bypass mode and drains all requests which were
  * throttled or issued before.  On return, it's guaranteed that no request
- * is being throttled or has ELVPRIV set.
+ * is being throttled or has ELVPRIV set and blk_queue_bypass() %true
+ * inside queue or RCU read lock.
  */
 void blk_queue_bypass_start(struct request_queue *q)
 {
@@ -426,6 +427,8 @@ void blk_queue_bypass_start(struct request_queue *q)
 	spin_unlock_irq(q->queue_lock);
 
 	blk_drain_queue(q, false);
+	/* ensure blk_queue_bypass() is %true inside RCU read lock */
+	synchronize_rcu();
 }
 EXPORT_SYMBOL_GPL(blk_queue_bypass_start);
 
-- 
1.7.7.3

[PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

With the previous change to guarantee bypass visiblity for RCU read
lock regions, entering bypass mode involves non-trivial overhead and
future changes are scheduled to make use of bypass mode during init
path.  Combined it may end up adding noticeable delay during boot.

This patch makes request_queue start its life in bypass mode, which is
ended on queue init completion at the end of
blk_init_allocated_queue(), and updates blk_queue_bypass_start() such
that draining and RCU synchronization are performed only when the
queue actually enters bypass mode.

This avoids unnecessarily switching in and out of bypass mode during
init avoiding the overhead and any nasty surprises which may step from
leaving bypass mode on half-initialized queues.

The boot time overhead was pointed out by Vivek.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-core.c |   37 +++++++++++++++++++++++++------------
 1 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index a4b3eaf..86027cd 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -421,14 +421,18 @@ void blk_drain_queue(struct request_queue *q, bool drain_all)
  */
 void blk_queue_bypass_start(struct request_queue *q)
 {
+	bool drain;
+
 	spin_lock_irq(q->queue_lock);
-	q->bypass_depth++;
+	drain = !q->bypass_depth++;
 	queue_flag_set(QUEUE_FLAG_BYPASS, q);
 	spin_unlock_irq(q->queue_lock);
 
-	blk_drain_queue(q, false);
-	/* ensure blk_queue_bypass() is %true inside RCU read lock */
-	synchronize_rcu();
+	if (drain) {
+		blk_drain_queue(q, false);
+		/* ensure blk_queue_bypass() is %true inside RCU read lock */
+		synchronize_rcu();
+	}
 }
 EXPORT_SYMBOL_GPL(blk_queue_bypass_start);
 
@@ -569,6 +573,15 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
 	 */
 	q->queue_lock = &q->__queue_lock;
 
+	/*
+	 * A queue starts its life with bypass turned on to avoid
+	 * unnecessary bypass on/off overhead and nasty surprises during
+	 * init.  The initial bypass will be finished at the end of
+	 * blk_init_allocated_queue().
+	 */
+	q->bypass_depth = 1;
+	__set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags);
+
 	if (blkcg_init_queue(q))
 		goto fail_id;
 
@@ -664,15 +677,15 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
 
 	q->sg_reserved_size = INT_MAX;
 
-	/*
-	 * all done
-	 */
-	if (!elevator_init(q, NULL)) {
-		blk_queue_congestion_threshold(q);
-		return q;
-	}
+	/* init elevator */
+	if (elevator_init(q, NULL))
+		return NULL;
 
-	return NULL;
+	blk_queue_congestion_threshold(q);
+
+	/* all done, end the initial bypass */
+	blk_queue_bypass_end(q);
+	return q;
 }
 EXPORT_SYMBOL(blk_init_allocated_queue);
 
-- 
1.7.7.3

[PATCH 08/11] blkcg: add request_queue->root_blkg

[Tejun Heo]

With per-queue policy activation, root blkg creation will be moved to
blkcg core.  Add q->root_blkg in preparation.  For blk-throtl, this
replaces throtl_data->root_tg; however, cfq needs to keep
cfqd->root_group for !CONFIG_CFQ_GROUP_IOSCHED.

This is to prepare for per-queue policy activation and doesn't cause
any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-throttle.c   |   16 ++++++++++------
 block/cfq-iosched.c    |    4 +++-
 include/linux/blkdev.h |    2 ++
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 6f1bfdf..8c520fa 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -97,7 +97,6 @@ struct throtl_data
 	/* service tree for active throtl groups */
 	struct throtl_rb_root tg_service_tree;
 
-	struct throtl_grp *root_tg;
 	struct request_queue *queue;
 
 	/* Total Number of queued bios on READ and WRITE lists */
@@ -131,6 +130,11 @@ static inline struct blkio_group *tg_to_blkg(struct throtl_grp *tg)
 	return pdata_to_blkg(tg);
 }
 
+static inline struct throtl_grp *td_root_tg(struct throtl_data *td)
+{
+	return blkg_to_tg(td->queue->root_blkg);
+}
+
 enum tg_state_flags {
 	THROTL_TG_FLAG_on_rr = 0,	/* on round-robin busy list */
 };
@@ -261,7 +265,7 @@ throtl_grp *throtl_lookup_tg(struct throtl_data *td, struct blkio_cgroup *blkcg)
 	 * Avoid lookup in this case
 	 */
 	if (blkcg == &blkio_root_cgroup)
-		return td->root_tg;
+		return td_root_tg(td);
 
 	return blkg_to_tg(blkg_lookup(blkcg, td->queue));
 }
@@ -277,7 +281,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
 	 * Avoid lookup in this case
 	 */
 	if (blkcg == &blkio_root_cgroup) {
-		tg = td->root_tg;
+		tg = td_root_tg(td);
 	} else {
 		struct blkio_group *blkg;
 
@@ -287,7 +291,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
 		if (!IS_ERR(blkg))
 			tg = blkg_to_tg(blkg);
 		else if (!blk_queue_dead(q))
-			tg = td->root_tg;
+			tg = td_root_tg(td);
 	}
 
 	return tg;
@@ -1245,12 +1249,12 @@ int blk_throtl_init(struct request_queue *q)
 
 	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
 	if (!IS_ERR(blkg))
-		td->root_tg = blkg_to_tg(blkg);
+		q->root_blkg = blkg;
 
 	spin_unlock_irq(q->queue_lock);
 	rcu_read_unlock();
 
-	if (!td->root_tg) {
+	if (!q->root_blkg) {
 		kfree(td);
 		return -ENOMEM;
 	}
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index de95f9a..86440e0 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3964,8 +3964,10 @@ static int cfq_init_queue(struct request_queue *q)
 	spin_lock_irq(q->queue_lock);
 
 	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
-	if (!IS_ERR(blkg))
+	if (!IS_ERR(blkg)) {
+		q->root_blkg = blkg;
 		cfqd->root_group = blkg_to_cfqg(blkg);
+	}
 
 	spin_unlock_irq(q->queue_lock);
 	rcu_read_unlock();
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d2c69f8..b01c377 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -31,6 +31,7 @@ struct blk_trace;
 struct request;
 struct sg_io_hdr;
 struct bsg_job;
+struct blkio_group;
 
 #define BLKDEV_MIN_RQ	4
 #define BLKDEV_MAX_RQ	128	/* Default maximum */
@@ -369,6 +370,7 @@ struct request_queue {
 
 	struct list_head	icq_list;
 #ifdef CONFIG_BLK_CGROUP
+	struct blkio_group	*root_blkg;
 	struct list_head	blkg_list;
 #endif
 
-- 
1.7.7.3

[PATCH 09/11] blkcg: implement per-queue policy activation

[Tejun Heo]

All blkcg policies were assumed to be enabled on all request_queues.
Due to various implementation obstacles, during the recent blkcg core
updates, this was temporarily implemented as shooting down all !root
blkgs on elevator switch and policy [de]registration combined with
half-broken in-place root blkg updates.  In addition to being buggy
and racy, this meant losing all blkcg configurations across those
events.

Now that blkcg is cleaned up enough, this patch replaces the temporary
implementation with proper per-queue policy activation.  Each blkcg
policy should call the new blkcg_[de]activate_policy() to enable and
disable the policy on a specific queue.  blkcg_activate_policy()
allocates and installs policy data for the policy for all existing
blkgs.  blkcg_deactivate_policy() does the reverse.  If a policy is
not enabled for a given queue, blkg printing / config functions skip
the respective blkg for the queue.

blkcg_activate_policy() also takes care of root blkg creation, and
cfq_init_queue() and blk_throtl_init() are updated accordingly.

This replaces blkcg_bypass_{start|end}() and update_root_blkg_pd()
unnecessary.  Dropped.

v2: cfq_init_queue() was returning uninitialized @ret on root_group
    alloc failure if !CONFIG_CFQ_GROUP_IOSCHED.  Fixed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c     |  228 ++++++++++++++++++++++++++++++++----------------
 block/blk-cgroup.h     |   15 +++-
 block/blk-throttle.c   |   52 ++++-------
 block/cfq-iosched.c    |   37 ++++-----
 block/elevator.c       |    2 -
 include/linux/blkdev.h |    1 +
 6 files changed, 201 insertions(+), 134 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index d6e4555..d6d59ad 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -54,6 +54,17 @@ struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio)
 }
 EXPORT_SYMBOL_GPL(bio_blkio_cgroup);
 
+static bool blkcg_policy_enabled(struct request_queue *q,
+				 const struct blkio_policy_type *pol)
+{
+	return pol && test_bit(pol->plid, q->blkcg_pols);
+}
+
+static size_t blkg_pd_size(const struct blkio_policy_type *pol)
+{
+	return sizeof(struct blkg_policy_data) + pol->pdata_size;
+}
+
 /**
  * blkg_free - free a blkg
  * @blkg: blkg to free
@@ -111,12 +122,11 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 		struct blkio_policy_type *pol = blkio_policy[i];
 		struct blkg_policy_data *pd;
 
-		if (!pol)
+		if (!blkcg_policy_enabled(q, pol))
 			continue;
 
 		/* alloc per-policy data and attach it to blkg */
-		pd = kzalloc_node(sizeof(*pd) + pol->pdata_size, GFP_ATOMIC,
-				  q->node);
+		pd = kzalloc_node(blkg_pd_size(pol), GFP_ATOMIC, q->node);
 		if (!pd) {
 			blkg_free(blkg);
 			return NULL;
@@ -130,7 +140,7 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 	for (i = 0; i < BLKCG_MAX_POLS; i++) {
 		struct blkio_policy_type *pol = blkio_policy[i];
 
-		if (pol)
+		if (blkcg_policy_enabled(blkg->q, pol))
 			pol->ops.blkio_init_group_fn(blkg);
 	}
 
@@ -236,36 +246,6 @@ static void blkg_destroy(struct blkio_group *blkg)
 	blkg_put(blkg);
 }
 
-/*
- * XXX: This updates blkg policy data in-place for root blkg, which is
- * necessary across elevator switch and policy registration as root blkgs
- * aren't shot down.  This broken and racy implementation is temporary.
- * Eventually, blkg shoot down will be replaced by proper in-place update.
- */
-void update_root_blkg_pd(struct request_queue *q,
-			 const struct blkio_policy_type *pol)
-{
-	struct blkio_group *blkg = blkg_lookup(&blkio_root_cgroup, q);
-	struct blkg_policy_data *pd;
-
-	if (!blkg)
-		return;
-
-	kfree(blkg->pd[pol->plid]);
-	blkg->pd[pol->plid] = NULL;
-
-	if (!pol)
-		return;
-
-	pd = kzalloc(sizeof(*pd) + pol->pdata_size, GFP_KERNEL);
-	WARN_ON_ONCE(!pd);
-
-	blkg->pd[pol->plid] = pd;
-	pd->blkg = blkg;
-	pol->ops.blkio_init_group_fn(blkg);
-}
-EXPORT_SYMBOL_GPL(update_root_blkg_pd);
-
 /**
  * blkg_destroy_all - destroy all blkgs associated with a request_queue
  * @q: request_queue of interest
@@ -339,7 +319,8 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
 		for (i = 0; i < BLKCG_MAX_POLS; i++) {
 			struct blkio_policy_type *pol = blkio_policy[i];
 
-			if (pol && pol->ops.blkio_reset_group_stats_fn)
+			if (blkcg_policy_enabled(blkg->q, pol) &&
+			    pol->ops.blkio_reset_group_stats_fn)
 				pol->ops.blkio_reset_group_stats_fn(blkg);
 		}
 	}
@@ -385,7 +366,7 @@ void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
 
 	spin_lock_irq(&blkcg->lock);
 	hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node)
-		if (blkg->pd[pol->plid])
+		if (blkcg_policy_enabled(blkg->q, pol))
 			total += prfill(sf, blkg->pd[pol->plid]->pdata, data);
 	spin_unlock_irq(&blkcg->lock);
 
@@ -510,7 +491,10 @@ int blkg_conf_prep(struct blkio_cgroup *blkcg,
 	rcu_read_lock();
 	spin_lock_irq(disk->queue->queue_lock);
 
-	blkg = blkg_lookup_create(blkcg, disk->queue, false);
+	if (blkcg_policy_enabled(disk->queue, pol))
+		blkg = blkg_lookup_create(blkcg, disk->queue, false);
+	else
+		blkg = ERR_PTR(-EINVAL);
 
 	if (IS_ERR(blkg)) {
 		ret = PTR_ERR(blkg);
@@ -712,30 +696,6 @@ static int blkiocg_can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
 	return ret;
 }
 
-static void blkcg_bypass_start(void)
-	__acquires(&all_q_mutex)
-{
-	struct request_queue *q;
-
-	mutex_lock(&all_q_mutex);
-
-	list_for_each_entry(q, &all_q_list, all_q_node) {
-		blk_queue_bypass_start(q);
-		blkg_destroy_all(q, false);
-	}
-}
-
-static void blkcg_bypass_end(void)
-	__releases(&all_q_mutex)
-{
-	struct request_queue *q;
-
-	list_for_each_entry(q, &all_q_list, all_q_node)
-		blk_queue_bypass_end(q);
-
-	mutex_unlock(&all_q_mutex);
-}
-
 struct cgroup_subsys blkio_subsys = {
 	.name = "blkio",
 	.create = blkiocg_create,
@@ -749,6 +709,139 @@ struct cgroup_subsys blkio_subsys = {
 EXPORT_SYMBOL_GPL(blkio_subsys);
 
 /**
+ * blkcg_activate_policy - activate a blkcg policy on a request_queue
+ * @q: request_queue of interest
+ * @pol: blkcg policy to activate
+ *
+ * Activate @pol on @q.  Requires %GFP_KERNEL context.  @q goes through
+ * bypass mode to populate its blkgs with policy_data for @pol.
+ *
+ * Activation happens with @q bypassed, so nobody would be accessing blkgs
+ * from IO path.  Update of each blkg is protected by both queue and blkcg
+ * locks so that holding either lock and testing blkcg_policy_enabled() is
+ * always enough for dereferencing policy data.
+ *
+ * The caller is responsible for synchronizing [de]activations and policy
+ * [un]registerations.  Returns 0 on success, -errno on failure.
+ */
+int blkcg_activate_policy(struct request_queue *q,
+			  const struct blkio_policy_type *pol)
+{
+	LIST_HEAD(pds);
+	struct blkio_group *blkg;
+	struct blkg_policy_data *pd, *n;
+	int cnt = 0, ret;
+
+	if (blkcg_policy_enabled(q, pol))
+		return 0;
+
+	blk_queue_bypass_start(q);
+
+	/* make sure the root blkg exists and count the existing blkgs */
+	spin_lock_irq(q->queue_lock);
+
+	rcu_read_lock();
+	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
+	rcu_read_unlock();
+
+	if (IS_ERR(blkg)) {
+		ret = PTR_ERR(blkg);
+		goto out_unlock;
+	}
+	q->root_blkg = blkg;
+
+	list_for_each_entry(blkg, &q->blkg_list, q_node)
+		cnt++;
+
+	spin_unlock_irq(q->queue_lock);
+
+	/* allocate policy_data for all existing blkgs */
+	while (cnt--) {
+		pd = kzalloc_node(blkg_pd_size(pol), GFP_KERNEL, q->node);
+		if (!pd) {
+			ret = -ENOMEM;
+			goto out_free;
+		}
+		list_add_tail(&pd->alloc_node, &pds);
+	}
+
+	/*
+	 * Install the allocated pds.  With @q bypassing, no new blkg
+	 * should have been created while the queue lock was dropped.
+	 */
+	spin_lock_irq(q->queue_lock);
+
+	list_for_each_entry(blkg, &q->blkg_list, q_node) {
+		if (WARN_ON(list_empty(&pds))) {
+			/* umm... this shouldn't happen, just abort */
+			ret = -ENOMEM;
+			goto out_unlock;
+		}
+		pd = list_first_entry(&pds, struct blkg_policy_data, alloc_node);
+		list_del_init(&pd->alloc_node);
+
+		/* grab blkcg lock too while installing @pd on @blkg */
+		spin_lock(&blkg->blkcg->lock);
+
+		blkg->pd[pol->plid] = pd;
+		pd->blkg = blkg;
+		pol->ops.blkio_init_group_fn(blkg);
+
+		spin_unlock(&blkg->blkcg->lock);
+	}
+
+	__set_bit(pol->plid, q->blkcg_pols);
+	ret = 0;
+out_unlock:
+	spin_unlock_irq(q->queue_lock);
+out_free:
+	blk_queue_bypass_end(q);
+	list_for_each_entry_safe(pd, n, &pds, alloc_node)
+		kfree(pd);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(blkcg_activate_policy);
+
+/**
+ * blkcg_deactivate_policy - deactivate a blkcg policy on a request_queue
+ * @q: request_queue of interest
+ * @pol: blkcg policy to deactivate
+ *
+ * Deactivate @pol on @q.  Follows the same synchronization rules as
+ * blkcg_activate_policy().
+ */
+void blkcg_deactivate_policy(struct request_queue *q,
+			     const struct blkio_policy_type *pol)
+{
+	struct blkio_group *blkg;
+
+	if (!blkcg_policy_enabled(q, pol))
+		return;
+
+	blk_queue_bypass_start(q);
+	spin_lock_irq(q->queue_lock);
+
+	__clear_bit(pol->plid, q->blkcg_pols);
+
+	list_for_each_entry(blkg, &q->blkg_list, q_node) {
+		/* grab blkcg lock too while removing @pd from @blkg */
+		spin_lock(&blkg->blkcg->lock);
+
+		if (pol->ops.blkio_exit_group_fn)
+			pol->ops.blkio_exit_group_fn(blkg);
+
+		kfree(blkg->pd[pol->plid]);
+		blkg->pd[pol->plid] = NULL;
+
+		spin_unlock(&blkg->blkcg->lock);
+	}
+
+	spin_unlock_irq(q->queue_lock);
+	blk_queue_bypass_end(q);
+}
+EXPORT_SYMBOL_GPL(blkcg_deactivate_policy);
+
+/**
  * blkio_policy_register - register a blkcg policy
  * @blkiop: blkcg policy to register
  *
@@ -758,7 +851,6 @@ EXPORT_SYMBOL_GPL(blkio_subsys);
  */
 int blkio_policy_register(struct blkio_policy_type *blkiop)
 {
-	struct request_queue *q;
 	int i, ret;
 
 	mutex_lock(&blkcg_pol_mutex);
@@ -775,11 +867,6 @@ int blkio_policy_register(struct blkio_policy_type *blkiop)
 	blkiop->plid = i;
 	blkio_policy[i] = blkiop;
 
-	blkcg_bypass_start();
-	list_for_each_entry(q, &all_q_list, all_q_node)
-		update_root_blkg_pd(q, blkiop);
-	blkcg_bypass_end();
-
 	/* everything is in place, add intf files for the new policy */
 	if (blkiop->cftypes)
 		WARN_ON(cgroup_add_cftypes(&blkio_subsys, blkiop->cftypes));
@@ -798,8 +885,6 @@ EXPORT_SYMBOL_GPL(blkio_policy_register);
  */
 void blkio_policy_unregister(struct blkio_policy_type *blkiop)
 {
-	struct request_queue *q;
-
 	mutex_lock(&blkcg_pol_mutex);
 
 	if (WARN_ON(blkio_policy[blkiop->plid] != blkiop))
@@ -811,11 +896,6 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop)
 
 	/* unregister and update blkgs */
 	blkio_policy[blkiop->plid] = NULL;
-
-	blkcg_bypass_start();
-	list_for_each_entry(q, &all_q_list, all_q_node)
-		update_root_blkg_pd(q, blkiop);
-	blkcg_bypass_end();
 out_unlock:
 	mutex_unlock(&blkcg_pol_mutex);
 }
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index df1c7b2..66253a7 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -64,6 +64,9 @@ struct blkg_policy_data {
 	/* the blkg this per-policy data belongs to */
 	struct blkio_group *blkg;
 
+	/* used during policy activation */
+	struct list_head alloc_node;
+
 	/* pol->pdata_size bytes of private data used by policy impl */
 	char pdata[] __aligned(__alignof__(unsigned long long));
 };
@@ -108,9 +111,11 @@ extern void blkcg_exit_queue(struct request_queue *q);
 /* Blkio controller policy registration */
 extern int blkio_policy_register(struct blkio_policy_type *);
 extern void blkio_policy_unregister(struct blkio_policy_type *);
+extern int blkcg_activate_policy(struct request_queue *q,
+				 const struct blkio_policy_type *pol);
+extern void blkcg_deactivate_policy(struct request_queue *q,
+				    const struct blkio_policy_type *pol);
 extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
-extern void update_root_blkg_pd(struct request_queue *q,
-				const struct blkio_policy_type *pol);
 
 void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
 		       u64 (*prfill)(struct seq_file *, void *, int),
@@ -325,10 +330,12 @@ static inline void blkcg_drain_queue(struct request_queue *q) { }
 static inline void blkcg_exit_queue(struct request_queue *q) { }
 static inline int blkio_policy_register(struct blkio_policy_type *blkiop) { return 0; }
 static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
+static inline int blkcg_activate_policy(struct request_queue *q,
+					const struct blkio_policy_type *pol) { return 0; }
+static inline void blkcg_deactivate_policy(struct request_queue *q,
+					   const struct blkio_policy_type *pol) { }
 static inline void blkg_destroy_all(struct request_queue *q,
 				    bool destory_root) { }
-static inline void update_root_blkg_pd(struct request_queue *q,
-				       const struct blkio_policy_type *pol) { }
 
 static inline void *blkg_to_pdata(struct blkio_group *blkg,
 				struct blkio_policy_type *pol) { return NULL; }
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 8c520fa..2fc964e 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -995,35 +995,31 @@ static int tg_set_conf(struct cgroup *cgrp, struct cftype *cft, const char *buf,
 	struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgrp);
 	struct blkg_conf_ctx ctx;
 	struct throtl_grp *tg;
+	struct throtl_data *td;
 	int ret;
 
 	ret = blkg_conf_prep(blkcg, &blkio_policy_throtl, buf, &ctx);
 	if (ret)
 		return ret;
 
-	ret = -EINVAL;
 	tg = blkg_to_tg(ctx.blkg);
-	if (tg) {
-		struct throtl_data *td = ctx.blkg->q->td;
-
-		if (!ctx.v)
-			ctx.v = -1;
+	td = ctx.blkg->q->td;
 
-		if (is_u64)
-			*(u64 *)((void *)tg + cft->private) = ctx.v;
-		else
-			*(unsigned int *)((void *)tg + cft->private) = ctx.v;
+	if (!ctx.v)
+		ctx.v = -1;
 
-		/* XXX: we don't need the following deferred processing */
-		xchg(&tg->limits_changed, true);
-		xchg(&td->limits_changed, true);
-		throtl_schedule_delayed_work(td, 0);
+	if (is_u64)
+		*(u64 *)((void *)tg + cft->private) = ctx.v;
+	else
+		*(unsigned int *)((void *)tg + cft->private) = ctx.v;
 
-		ret = 0;
-	}
+	/* XXX: we don't need the following deferred processing */
+	xchg(&tg->limits_changed, true);
+	xchg(&td->limits_changed, true);
+	throtl_schedule_delayed_work(td, 0);
 
 	blkg_conf_finish(&ctx);
-	return ret;
+	return 0;
 }
 
 static int tg_set_conf_u64(struct cgroup *cgrp, struct cftype *cft,
@@ -1230,7 +1226,7 @@ void blk_throtl_drain(struct request_queue *q)
 int blk_throtl_init(struct request_queue *q)
 {
 	struct throtl_data *td;
-	struct blkio_group *blkg;
+	int ret;
 
 	td = kzalloc_node(sizeof(*td), GFP_KERNEL, q->node);
 	if (!td)
@@ -1243,28 +1239,18 @@ int blk_throtl_init(struct request_queue *q)
 	q->td = td;
 	td->queue = q;
 
-	/* alloc and init root group. */
-	rcu_read_lock();
-	spin_lock_irq(q->queue_lock);
-
-	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
-	if (!IS_ERR(blkg))
-		q->root_blkg = blkg;
-
-	spin_unlock_irq(q->queue_lock);
-	rcu_read_unlock();
-
-	if (!q->root_blkg) {
+	/* activate policy */
+	ret = blkcg_activate_policy(q, &blkio_policy_throtl);
+	if (ret)
 		kfree(td);
-		return -ENOMEM;
-	}
-	return 0;
+	return ret;
 }
 
 void blk_throtl_exit(struct request_queue *q)
 {
 	BUG_ON(!q->td);
 	throtl_shutdown_wq(q);
+	blkcg_deactivate_policy(q, &blkio_policy_throtl);
 	kfree(q->td);
 }
 
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 86440e0..0203652 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1406,8 +1406,7 @@ static int cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
 
 	ret = -EINVAL;
 	cfqg = blkg_to_cfqg(ctx.blkg);
-	if (cfqg && (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN &&
-				ctx.v <= CFQ_WEIGHT_MAX))) {
+	if (!ctx.v || (ctx.v >= CFQ_WEIGHT_MIN && ctx.v <= CFQ_WEIGHT_MAX)) {
 		cfqg->dev_weight = ctx.v;
 		cfqg->new_weight = cfqg->dev_weight ?: blkcg->cfq_weight;
 		ret = 0;
@@ -3938,7 +3937,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
 #ifndef CONFIG_CFQ_GROUP_IOSCHED
 	kfree(cfqd->root_group);
 #endif
-	update_root_blkg_pd(q, &blkio_policy_cfq);
+	blkcg_deactivate_policy(q, &blkio_policy_cfq);
 	kfree(cfqd);
 }
 
@@ -3946,7 +3945,7 @@ static int cfq_init_queue(struct request_queue *q)
 {
 	struct cfq_data *cfqd;
 	struct blkio_group *blkg __maybe_unused;
-	int i;
+	int i, ret;
 
 	cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node);
 	if (!cfqd)
@@ -3960,28 +3959,20 @@ static int cfq_init_queue(struct request_queue *q)
 
 	/* Init root group and prefer root group over other groups by default */
 #ifdef CONFIG_CFQ_GROUP_IOSCHED
-	rcu_read_lock();
-	spin_lock_irq(q->queue_lock);
-
-	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
-	if (!IS_ERR(blkg)) {
-		q->root_blkg = blkg;
-		cfqd->root_group = blkg_to_cfqg(blkg);
-	}
+	ret = blkcg_activate_policy(q, &blkio_policy_cfq);
+	if (ret)
+		goto out_free;
 
-	spin_unlock_irq(q->queue_lock);
-	rcu_read_unlock();
+	cfqd->root_group = blkg_to_cfqg(q->root_blkg);
 #else
+	ret = -ENOMEM;
 	cfqd->root_group = kzalloc_node(sizeof(*cfqd->root_group),
 					GFP_KERNEL, cfqd->queue->node);
-	if (cfqd->root_group)
-		cfq_init_cfqg_base(cfqd->root_group);
-#endif
-	if (!cfqd->root_group) {
-		kfree(cfqd);
-		return -ENOMEM;
-	}
+	if (!cfqd->root_group)
+		goto out_free;
 
+	cfq_init_cfqg_base(cfqd->root_group);
+#endif
 	cfqd->root_group->weight = 2 * CFQ_WEIGHT_DEFAULT;
 
 	/*
@@ -4031,6 +4022,10 @@ static int cfq_init_queue(struct request_queue *q)
 	 */
 	cfqd->last_delayed_sync = jiffies - HZ;
 	return 0;
+
+out_free:
+	kfree(cfqd);
+	return ret;
 }
 
 /*
diff --git a/block/elevator.c b/block/elevator.c
index be3ab6d..6a55d41 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -896,8 +896,6 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e)
 	ioc_clear_queue(q);
 	spin_unlock_irq(q->queue_lock);
 
-	blkg_destroy_all(q, false);
-
 	/* allocate, init and register new elevator */
 	err = -ENOMEM;
 	q->elevator = elevator_alloc(q, new_e);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index b01c377..68720ab 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -370,6 +370,7 @@ struct request_queue {
 
 	struct list_head	icq_list;
 #ifdef CONFIG_BLK_CGROUP
+	DECLARE_BITMAP		(blkcg_pols, BLKCG_MAX_POLS);
 	struct blkio_group	*root_blkg;
 	struct list_head	blkg_list;
 #endif
-- 
1.7.7.3

[PATCH 10/11] blkcg: drop stuff unused after per-queue policy activation update

[Tejun Heo]

* All_q_list is unused.  Drop all_q_{mutex|list}.

* @for_root of blkg_lookup_create() is always %false when called from
  outside blk-cgroup.c proper.  Factor out __blkg_lookup_create() so
  that it doesn't check whether @q is bypassing and use the
  underscored version for the @for_root callsite.

* blkg_destroy_all() is used only from blkcg proper and @destroy_root
  is always %true.  Make it static and drop @destroy_root.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c   |   61 ++++++++++++++++---------------------------------
 block/blk-cgroup.h   |    6 +----
 block/blk-throttle.c |    2 +-
 block/cfq-iosched.c  |    2 +-
 4 files changed, 23 insertions(+), 48 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index d6d59ad..10f0d2f 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -25,8 +25,6 @@
 #define MAX_KEY_LEN 100
 
 static DEFINE_MUTEX(blkcg_pol_mutex);
-static DEFINE_MUTEX(all_q_mutex);
-static LIST_HEAD(all_q_list);
 
 struct blkio_cgroup blkio_root_cgroup = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT };
 EXPORT_SYMBOL_GPL(blkio_root_cgroup);
@@ -179,9 +177,8 @@ struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
 }
 EXPORT_SYMBOL_GPL(blkg_lookup);
 
-struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
-				       struct request_queue *q,
-				       bool for_root)
+static struct blkio_group *__blkg_lookup_create(struct blkio_cgroup *blkcg,
+						struct request_queue *q)
 	__releases(q->queue_lock) __acquires(q->queue_lock)
 {
 	struct blkio_group *blkg;
@@ -189,13 +186,6 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 	WARN_ON_ONCE(!rcu_read_lock_held());
 	lockdep_assert_held(q->queue_lock);
 
-	/*
-	 * This could be the first entry point of blkcg implementation and
-	 * we shouldn't allow anything to go through for a bypassing queue.
-	 */
-	if (unlikely(blk_queue_bypass(q)) && !for_root)
-		return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
-
 	blkg = __blkg_lookup(blkcg, q);
 	if (blkg)
 		return blkg;
@@ -223,6 +213,18 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 out:
 	return blkg;
 }
+
+struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
+				       struct request_queue *q)
+{
+	/*
+	 * This could be the first entry point of blkcg implementation and
+	 * we shouldn't allow anything to go through for a bypassing queue.
+	 */
+	if (unlikely(blk_queue_bypass(q)))
+		return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
+	return __blkg_lookup_create(blkcg, q);
+}
 EXPORT_SYMBOL_GPL(blkg_lookup_create);
 
 static void blkg_destroy(struct blkio_group *blkg)
@@ -249,12 +251,10 @@ static void blkg_destroy(struct blkio_group *blkg)
 /**
  * blkg_destroy_all - destroy all blkgs associated with a request_queue
  * @q: request_queue of interest
- * @destroy_root: whether to destroy root blkg or not
  *
- * Destroy blkgs associated with @q.  If @destroy_root is %true, all are
- * destroyed; otherwise, root blkg is left alone.
+ * Destroy all blkgs associated with @q.
  */
-void blkg_destroy_all(struct request_queue *q, bool destroy_root)
+static void blkg_destroy_all(struct request_queue *q)
 {
 	struct blkio_group *blkg, *n;
 
@@ -263,10 +263,6 @@ void blkg_destroy_all(struct request_queue *q, bool destroy_root)
 	list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
 		struct blkio_cgroup *blkcg = blkg->blkcg;
 
-		/* skip root? */
-		if (!destroy_root && blkg->blkcg == &blkio_root_cgroup)
-			continue;
-
 		spin_lock(&blkcg->lock);
 		blkg_destroy(blkg);
 		spin_unlock(&blkcg->lock);
@@ -274,7 +270,6 @@ void blkg_destroy_all(struct request_queue *q, bool destroy_root)
 
 	spin_unlock_irq(q->queue_lock);
 }
-EXPORT_SYMBOL_GPL(blkg_destroy_all);
 
 static void blkg_rcu_free(struct rcu_head *rcu_head)
 {
@@ -492,7 +487,7 @@ int blkg_conf_prep(struct blkio_cgroup *blkcg,
 	spin_lock_irq(disk->queue->queue_lock);
 
 	if (blkcg_policy_enabled(disk->queue, pol))
-		blkg = blkg_lookup_create(blkcg, disk->queue, false);
+		blkg = blkg_lookup_create(blkcg, disk->queue);
 	else
 		blkg = ERR_PTR(-EINVAL);
 
@@ -625,20 +620,9 @@ done:
  */
 int blkcg_init_queue(struct request_queue *q)
 {
-	int ret;
-
 	might_sleep();
 
-	ret = blk_throtl_init(q);
-	if (ret)
-		return ret;
-
-	mutex_lock(&all_q_mutex);
-	INIT_LIST_HEAD(&q->all_q_node);
-	list_add_tail(&q->all_q_node, &all_q_list);
-	mutex_unlock(&all_q_mutex);
-
-	return 0;
+	return blk_throtl_init(q);
 }
 
 /**
@@ -662,12 +646,7 @@ void blkcg_drain_queue(struct request_queue *q)
  */
 void blkcg_exit_queue(struct request_queue *q)
 {
-	mutex_lock(&all_q_mutex);
-	list_del_init(&q->all_q_node);
-	mutex_unlock(&all_q_mutex);
-
-	blkg_destroy_all(q, true);
-
+	blkg_destroy_all(q);
 	blk_throtl_exit(q);
 }
 
@@ -741,7 +720,7 @@ int blkcg_activate_policy(struct request_queue *q,
 	spin_lock_irq(q->queue_lock);
 
 	rcu_read_lock();
-	blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
+	blkg = __blkg_lookup_create(&blkio_root_cgroup, q);
 	rcu_read_unlock();
 
 	if (IS_ERR(blkg)) {
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 66253a7..222063d 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -115,7 +115,6 @@ extern int blkcg_activate_policy(struct request_queue *q,
 				 const struct blkio_policy_type *pol);
 extern void blkcg_deactivate_policy(struct request_queue *q,
 				    const struct blkio_policy_type *pol);
-extern void blkg_destroy_all(struct request_queue *q, bool destroy_root);
 
 void blkcg_print_blkgs(struct seq_file *sf, struct blkio_cgroup *blkcg,
 		       u64 (*prfill)(struct seq_file *, void *, int),
@@ -334,8 +333,6 @@ static inline int blkcg_activate_policy(struct request_queue *q,
 					const struct blkio_policy_type *pol) { return 0; }
 static inline void blkcg_deactivate_policy(struct request_queue *q,
 					   const struct blkio_policy_type *pol) { }
-static inline void blkg_destroy_all(struct request_queue *q,
-				    bool destory_root) { }
 
 static inline void *blkg_to_pdata(struct blkio_group *blkg,
 				struct blkio_policy_type *pol) { return NULL; }
@@ -354,8 +351,7 @@ extern struct blkio_cgroup *bio_blkio_cgroup(struct bio *bio);
 extern struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
 				       struct request_queue *q);
 struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
-				       struct request_queue *q,
-				       bool for_root);
+				       struct request_queue *q);
 #else
 struct cgroup;
 static inline struct blkio_cgroup *
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 2fc964e..e2aaf27 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -285,7 +285,7 @@ static struct throtl_grp *throtl_lookup_create_tg(struct throtl_data *td,
 	} else {
 		struct blkio_group *blkg;
 
-		blkg = blkg_lookup_create(blkcg, q, false);
+		blkg = blkg_lookup_create(blkcg, q);
 
 		/* if %NULL and @q is alive, fall back to root_tg */
 		if (!IS_ERR(blkg))
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 0203652..eb07eb6 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1348,7 +1348,7 @@ static struct cfq_group *cfq_lookup_create_cfqg(struct cfq_data *cfqd,
 	} else {
 		struct blkio_group *blkg;
 
-		blkg = blkg_lookup_create(blkcg, q, false);
+		blkg = blkg_lookup_create(blkcg, q);
 		if (!IS_ERR(blkg))
 			cfqg = blkg_to_cfqg(blkg);
 	}
-- 
1.7.7.3

[PATCH 11/11] blkcg: shoot down blkgs if all policies are deactivated

[Tejun Heo]

There's no reason to keep blkgs around if no policy is activated for
the queue.  This patch moves queue locking out of blkg_destroy_all()
and call it from blkg_deactivate_policy() on deactivation of the last
policy on the queue.

This change was suggested by Vivek.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-cgroup.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 10f0d2f..b1807d4 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -258,7 +258,7 @@ static void blkg_destroy_all(struct request_queue *q)
 {
 	struct blkio_group *blkg, *n;
 
-	spin_lock_irq(q->queue_lock);
+	lockdep_assert_held(q->queue_lock);
 
 	list_for_each_entry_safe(blkg, n, &q->blkg_list, q_node) {
 		struct blkio_cgroup *blkcg = blkg->blkcg;
@@ -267,8 +267,6 @@ static void blkg_destroy_all(struct request_queue *q)
 		blkg_destroy(blkg);
 		spin_unlock(&blkcg->lock);
 	}
-
-	spin_unlock_irq(q->queue_lock);
 }
 
 static void blkg_rcu_free(struct rcu_head *rcu_head)
@@ -646,7 +644,10 @@ void blkcg_drain_queue(struct request_queue *q)
  */
 void blkcg_exit_queue(struct request_queue *q)
 {
+	spin_lock_irq(q->queue_lock);
 	blkg_destroy_all(q);
+	spin_unlock_irq(q->queue_lock);
+
 	blk_throtl_exit(q);
 }
 
@@ -802,6 +803,10 @@ void blkcg_deactivate_policy(struct request_queue *q,
 
 	__clear_bit(pol->plid, q->blkcg_pols);
 
+	/* if no policy is left, no need for blkgs - shoot them down */
+	if (bitmap_empty(q->blkcg_pols, BLKCG_MAX_POLS))
+		blkg_destroy_all(q);
+
 	list_for_each_entry(blkg, &q->blkg_list, q_node) {
 		/* grab blkcg lock too while removing @pd from @blkg */
 		spin_lock(&blkg->blkcg->lock);
-- 
1.7.7.3

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Vivek Goyal]

On Fri, Apr 13, 2012 at 01:11:31PM -0700, Tejun Heo wrote:
> With the previous change to guarantee bypass visiblity for RCU read
> lock regions, entering bypass mode involves non-trivial overhead and
> future changes are scheduled to make use of bypass mode during init
> path.  Combined it may end up adding noticeable delay during boot.
> 
> This patch makes request_queue start its life in bypass mode, which is
> ended on queue init completion at the end of
> blk_init_allocated_queue(), and updates blk_queue_bypass_start() such
> that draining and RCU synchronization are performed only when the
> queue actually enters bypass mode.
> 
> This avoids unnecessarily switching in and out of bypass mode during
> init avoiding the overhead and any nasty surprises which may step from
> leaving bypass mode on half-initialized queues.

Tejun, I am not sure that this will fix the problem completely. I think
we will still face the overhead of synchronize_rcu() in
blkcg_deactivate_policy() as it will be called from cfq_exit_queue() for
initialized queues.

In the past I had I had used synchronize_rcu() in cfq_exit_queue() and
noticed the overhead. Looks like driver was creating fully initialized
queues and tearing these apart soon.

Thanks
Vivek

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Fri, Apr 13, 2012 at 04:32:05PM -0400, Vivek Goyal wrote:
> On Fri, Apr 13, 2012 at 01:11:31PM -0700, Tejun Heo wrote:
> > With the previous change to guarantee bypass visiblity for RCU read
> > lock regions, entering bypass mode involves non-trivial overhead and
> > future changes are scheduled to make use of bypass mode during init
> > path.  Combined it may end up adding noticeable delay during boot.
> > 
> > This patch makes request_queue start its life in bypass mode, which is
> > ended on queue init completion at the end of
> > blk_init_allocated_queue(), and updates blk_queue_bypass_start() such
> > that draining and RCU synchronization are performed only when the
> > queue actually enters bypass mode.
> > 
> > This avoids unnecessarily switching in and out of bypass mode during
> > init avoiding the overhead and any nasty surprises which may step from
> > leaving bypass mode on half-initialized queues.
> 
> Tejun, I am not sure that this will fix the problem completely. I think
> we will still face the overhead of synchronize_rcu() in
> blkcg_deactivate_policy() as it will be called from cfq_exit_queue() for
> initialized queues.
> 
> In the past I had I had used synchronize_rcu() in cfq_exit_queue() and
> noticed the overhead. Looks like driver was creating fully initialized
> queues and tearing these apart soon.

blk_cleanup_queue() doesn't use blk_queue_bypass_start() to enter
bypass mode.

Thanks.

-- 
tejun

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Vivek Goyal]

On Fri, Apr 13, 2012 at 04:32:05PM -0400, Vivek Goyal wrote:
> On Fri, Apr 13, 2012 at 01:11:31PM -0700, Tejun Heo wrote:
> > With the previous change to guarantee bypass visiblity for RCU read
> > lock regions, entering bypass mode involves non-trivial overhead and
> > future changes are scheduled to make use of bypass mode during init
> > path.  Combined it may end up adding noticeable delay during boot.
> > 
> > This patch makes request_queue start its life in bypass mode, which is
> > ended on queue init completion at the end of
> > blk_init_allocated_queue(), and updates blk_queue_bypass_start() such
> > that draining and RCU synchronization are performed only when the
> > queue actually enters bypass mode.
> > 
> > This avoids unnecessarily switching in and out of bypass mode during
> > init avoiding the overhead and any nasty surprises which may step from
> > leaving bypass mode on half-initialized queues.
> 
> Tejun, I am not sure that this will fix the problem completely. I think
> we will still face the overhead of synchronize_rcu() in
> blkcg_deactivate_policy() as it will be called from cfq_exit_queue() for
> initialized queues.
> 
> In the past I had I had used synchronize_rcu() in cfq_exit_queue() and
> noticed the overhead. Looks like driver was creating fully initialized
> queues and tearing these apart soon.

Here is the old commit. Driver in question was megaraid.

commit bb729bc98c0f3e6a898d8730df3e2830bf68751a
Author: Jens Axboe <jens.axboe@oracle.com>
Date:   Sun Dec 6 09:54:19 2009 +0100

    cfq-iosched: use call_rcu() instead of doing grace period stall on queue exit

    After the merge of the IO controller patches, booting on my megaraid box
    ran much slower. Vivek Goyal traced it down to megaraid discovery creating
    tons of devices, each suffering a grace period when they later kill that
    queue (if no device is found).
    
    So lets use call_rcu() to batch these deferred frees, instead of taking
    the grace period hit for each one.

Thanks
Vivek

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Vivek Goyal]

On Fri, Apr 13, 2012 at 01:37:26PM -0700, Tejun Heo wrote:

[..]
> blk_cleanup_queue() doesn't use blk_queue_bypass_start() to enter
> bypass mode.

Oh now elevator_exit() has been moved into blk_release_queue(). But
problem will still be there, isn't it? During driver init, most likely driver
is holding last reference of the queue and blk_release_queue() will be called
in the context of blk_cleanup_queue() causing the overhead?

Thanks
Vivek

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Fri, Apr 13, 2012 at 04:44:46PM -0400, Vivek Goyal wrote:
> On Fri, Apr 13, 2012 at 01:37:26PM -0700, Tejun Heo wrote:
> 
> [..]
> > blk_cleanup_queue() doesn't use blk_queue_bypass_start() to enter
> > bypass mode.
> 
> Oh now elevator_exit() has been moved into blk_release_queue(). But
> problem will still be there, isn't it? During driver init, most likely driver
> is holding last reference of the queue and blk_release_queue() will be called
> in the context of blk_cleanup_queue() causing the overhead?

Hmmm?  blk_cleanup_queue() will put the queue into bypassing mode
without going through synchronize_rcu() and all the following
bypassing operations just inc/decs bypass_depth without any draining
operation.

Thanks.

-- 
tejun

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Vivek Goyal]

On Fri, Apr 13, 2012 at 01:47:10PM -0700, Tejun Heo wrote:
> On Fri, Apr 13, 2012 at 04:44:46PM -0400, Vivek Goyal wrote:
> > On Fri, Apr 13, 2012 at 01:37:26PM -0700, Tejun Heo wrote:
> > 
> > [..]
> > > blk_cleanup_queue() doesn't use blk_queue_bypass_start() to enter
> > > bypass mode.
> > 
> > Oh now elevator_exit() has been moved into blk_release_queue(). But
> > problem will still be there, isn't it? During driver init, most likely driver
> > is holding last reference of the queue and blk_release_queue() will be called
> > in the context of blk_cleanup_queue() causing the overhead?
> 
> Hmmm?  blk_cleanup_queue() will put the queue into bypassing mode
> without going through synchronize_rcu() and all the following
> bypassing operations just inc/decs bypass_depth without any draining
> operation.

Ok, this is non-obivirious part. The very reason you could do the
optimzation of synchronize_rcu(), was the fact that either somebody
has already called synchronize_rcu() (first caller of blk_bypass_start())
or we know that it is not needed (as we are instanciating queue and no
IO could be going on).

But neither seems to be the case here. So to make sure that blkg_lookup()
under rcu will see the updated value of queue flag (bypass), are we
relying on the fact that caller should see the DEAD flag and not go
ahead with blkg_lookup()?  If yes, atleast it is not obivious.

Thanks
Vivek

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> But neither seems to be the case here. So to make sure that blkg_lookup()
> under rcu will see the updated value of queue flag (bypass), are we
> relying on the fact that caller should see the DEAD flag and not go
> ahead with blkg_lookup()?  If yes, atleast it is not obivious.

We're relying on the fact that it doesn't matter anymore because all
blkgs will be shoot down in queue cleanup path which goes through rcu
free, which is different from deactivating individual policies.  It
indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
hell was megaraid messing with so many queues anyways?

Thanks.

-- 
tejun

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Fri, Apr 13, 2012 at 02:05:48PM -0700, Tejun Heo wrote:
> On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> > But neither seems to be the case here. So to make sure that blkg_lookup()
> > under rcu will see the updated value of queue flag (bypass), are we
> > relying on the fact that caller should see the DEAD flag and not go
> > ahead with blkg_lookup()?  If yes, atleast it is not obivious.
> 
> We're relying on the fact that it doesn't matter anymore because all
> blkgs will be shoot down in queue cleanup path which goes through rcu
> free, which is different from deactivating individual policies.  It
> indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
> hell was megaraid messing with so many queues anyways?

I suppose megaraid depends on sequential LUN scan which SCSI
implements by creating sdev for each LUN, trying to see whether it
actually exists and then destroys the sdev if not.  Urgh.... so, we
seem to be stuck with it.

So, the current code is technically correct although subtle like hell.
We can RCU defer blk_put_queue() from blk_cleanup_queue() using
call_rcu() to make clear that RCU grace period is necessary there.
Any better ideas?

Thanks.

-- 
tejun

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Fri, Apr 13, 2012 at 02:16:40PM -0700, Tejun Heo wrote:
> On Fri, Apr 13, 2012 at 02:05:48PM -0700, Tejun Heo wrote:
> > On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> > > But neither seems to be the case here. So to make sure that blkg_lookup()
> > > under rcu will see the updated value of queue flag (bypass), are we
> > > relying on the fact that caller should see the DEAD flag and not go
> > > ahead with blkg_lookup()?  If yes, atleast it is not obivious.
> > 
> > We're relying on the fact that it doesn't matter anymore because all
> > blkgs will be shoot down in queue cleanup path which goes through rcu
> > free, which is different from deactivating individual policies.  It
> > indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
> > hell was megaraid messing with so many queues anyways?
> 
> I suppose megaraid depends on sequential LUN scan which SCSI
> implements by creating sdev for each LUN, trying to see whether it
> actually exists and then destroys the sdev if not.  Urgh.... so, we
> seem to be stuck with it.
> 
> So, the current code is technically correct although subtle like hell.
> We can RCU defer blk_put_queue() from blk_cleanup_queue() using
> call_rcu() to make clear that RCU grace period is necessary there.
> Any better ideas?

I think I'm just gonna add comments clarifying why explicit
synchronize_rcu() isn't necessary there and the expected behavior (RCU
deferred freeing of any data structures which may be accessed under
RCU read lock) on queue cleanup path.  Doing RCU deferral would
require double bouncing (first through RCU then through workqueue)
because blk_release_queue() requires process context.  :(

Thanks.

-- 
tejun

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Vivek Goyal]

On Fri, Apr 13, 2012 at 02:05:48PM -0700, Tejun Heo wrote:
> On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> > But neither seems to be the case here. So to make sure that blkg_lookup()
> > under rcu will see the updated value of queue flag (bypass), are we
> > relying on the fact that caller should see the DEAD flag and not go
> > ahead with blkg_lookup()?  If yes, atleast it is not obivious.
> 
> We're relying on the fact that it doesn't matter anymore because all
> blkgs will be shoot down in queue cleanup path which goes through rcu
> free, which is different from deactivating individual policies.  It
> indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
> hell was megaraid messing with so many queues anyways?

Well, blkcg_deactivate_policy() frees the policy data in a non-rcu
manner. So group is around but policy data is gone. So technically if some
IO submitter does not see the queue bypass flag, he might still try to
access blkg->pd[pol->plid] after being freed.

Having said that, in this case we are probably fine as blk_release_queue()
is executed after last reference to queue is dropped and no more IO can
come. May be a 2 line comment will help.

elevator_switch() path of deactivation policy is anyway fine as it will
call synchronize_rcu().

BTW, looks like blkio_exit_group_fn() probably is not a good name anymore
as it is not even called when policy is being deactivated. It should
probably be now .blkio_exit_policy_data_fn() or something like that.

Thanks
Vivek

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Fri, Apr 13, 2012 at 05:33:44PM -0400, Vivek Goyal wrote:
> On Fri, Apr 13, 2012 at 02:05:48PM -0700, Tejun Heo wrote:
> > On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> > > But neither seems to be the case here. So to make sure that blkg_lookup()
> > > under rcu will see the updated value of queue flag (bypass), are we
> > > relying on the fact that caller should see the DEAD flag and not go
> > > ahead with blkg_lookup()?  If yes, atleast it is not obivious.
> > 
> > We're relying on the fact that it doesn't matter anymore because all
> > blkgs will be shoot down in queue cleanup path which goes through rcu
> > free, which is different from deactivating individual policies.  It
> > indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
> > hell was megaraid messing with so many queues anyways?
> 
> Well, blkcg_deactivate_policy() frees the policy data in a non-rcu
> manner. So group is around but policy data is gone. So technically if some
> IO submitter does not see the queue bypass flag, he might still try to
> access blkg->pd[pol->plid] after being freed.

No, we always go through blkg_destroy_all() and each blkg along with
any attached policy_data will go through RCU grace period before
getting destroyed.  It is stupid subtle but nevertheless correct.

> Having said that, in this case we are probably fine as blk_release_queue()
> is executed after last reference to queue is dropped and no more IO can
> come. May be a 2 line comment will help.

Yeah, we're guaranteed that by the time blk_release_queue() executes
nobody is traversing the queue.  Hmmm... right, this is much easier to
wrap one's head around.  I'll use this explanation in the comment.

> BTW, looks like blkio_exit_group_fn() probably is not a good name anymore
> as it is not even called when policy is being deactivated. It should
> probably be now .blkio_exit_policy_data_fn() or something like that.

Heh, I'm brewing mass blkcg API rename patch as we speak.

Thanks.

-- 
tejun

[PATCH UPDATED 06/11] blkcg: make sure blkg_lookup() returns %NULL if @q is bypassing

[Tejun Heo]

Currently, blkg_lookup() doesn't check @q bypass state.  This patch
updates blk_queue_bypass_start() to do synchronize_rcu() before
returning and updates blkg_lookup() to check blk_queue_bypass() and
return %NULL if bypassing.  This ensures blkg_lookup() returns %NULL
if @q is bypassing.

This is to guarantee that nobody is accessing policy data while @q is
bypassing, which is necessary to allow replacing blkio_cgroup->pd[] in
place on policy [de]activation.

v2: Added more comments explaining bypass guarantees as suggested by
    Vivek.

v3: Added more comments explaining why there's no synchronize_rcu() in
    blk_cleanup_queue() as suggested by Vivek.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
This update only adds some comments.  It does cause some offset
warnings for the following patches but nothing patch(1) can't handle.
The git branch has been updated accordingly.

Thanks.

 block/blk-cgroup.c |   50 +++++++++++++++++++++++++++++++++-----------------
 block/blk-core.c   |   15 +++++++++++++--
 2 files changed, 46 insertions(+), 19 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index f6581a0..d6e4555 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -137,6 +137,38 @@ static struct blkio_group *blkg_alloc(struct blkio_cgroup *blkcg,
 	return blkg;
 }
 
+static struct blkio_group *__blkg_lookup(struct blkio_cgroup *blkcg,
+					 struct request_queue *q)
+{
+	struct blkio_group *blkg;
+	struct hlist_node *n;
+
+	hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node)
+		if (blkg->q == q)
+			return blkg;
+	return NULL;
+}
+
+/**
+ * blkg_lookup - lookup blkg for the specified blkcg - q pair
+ * @blkcg: blkcg of interest
+ * @q: request_queue of interest
+ *
+ * Lookup blkg for the @blkcg - @q pair.  This function should be called
+ * under RCU read lock and is guaranteed to return %NULL if @q is bypassing
+ * - see blk_queue_bypass_start() for details.
+ */
+struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
+				struct request_queue *q)
+{
+	WARN_ON_ONCE(!rcu_read_lock_held());
+
+	if (unlikely(blk_queue_bypass(q)))
+		return NULL;
+	return __blkg_lookup(blkcg, q);
+}
+EXPORT_SYMBOL_GPL(blkg_lookup);
+
 struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 				       struct request_queue *q,
 				       bool for_root)
@@ -150,13 +182,11 @@ struct blkio_group *blkg_lookup_create(struct blkio_cgroup *blkcg,
 	/*
 	 * This could be the first entry point of blkcg implementation and
 	 * we shouldn't allow anything to go through for a bypassing queue.
-	 * The following can be removed if blkg lookup is guaranteed to
-	 * fail on a bypassing queue.
 	 */
 	if (unlikely(blk_queue_bypass(q)) && !for_root)
 		return ERR_PTR(blk_queue_dead(q) ? -EINVAL : -EBUSY);
 
-	blkg = blkg_lookup(blkcg, q);
+	blkg = __blkg_lookup(blkcg, q);
 	if (blkg)
 		return blkg;
 
@@ -185,20 +215,6 @@ out:
 }
 EXPORT_SYMBOL_GPL(blkg_lookup_create);
 
-/* called under rcu_read_lock(). */
-struct blkio_group *blkg_lookup(struct blkio_cgroup *blkcg,
-				struct request_queue *q)
-{
-	struct blkio_group *blkg;
-	struct hlist_node *n;
-
-	hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node)
-		if (blkg->q == q)
-			return blkg;
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(blkg_lookup);
-
 static void blkg_destroy(struct blkio_group *blkg)
 {
 	struct request_queue *q = blkg->q;
diff --git a/block/blk-core.c b/block/blk-core.c
index 991c1d6..f2db628 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -416,7 +416,8 @@ void blk_drain_queue(struct request_queue *q, bool drain_all)
  * In bypass mode, only the dispatch FIFO queue of @q is used.  This
  * function makes @q enter bypass mode and drains all requests which were
  * throttled or issued before.  On return, it's guaranteed that no request
- * is being throttled or has ELVPRIV set.
+ * is being throttled or has ELVPRIV set and blk_queue_bypass() %true
+ * inside queue or RCU read lock.
  */
 void blk_queue_bypass_start(struct request_queue *q)
 {
@@ -426,6 +427,8 @@ void blk_queue_bypass_start(struct request_queue *q)
 	spin_unlock_irq(q->queue_lock);
 
 	blk_drain_queue(q, false);
+	/* ensure blk_queue_bypass() is %true inside RCU read lock */
+	synchronize_rcu();
 }
 EXPORT_SYMBOL_GPL(blk_queue_bypass_start);
 
@@ -462,7 +465,15 @@ void blk_cleanup_queue(struct request_queue *q)
 
 	spin_lock_irq(lock);
 
-	/* dead queue is permanently in bypass mode till released */
+	/*
+	 * Dead queue is permanently in bypass mode till released.  Note
+	 * that, unlike blk_queue_bypass_start(), we aren't performing
+	 * synchronize_rcu() after entering bypass mode to avoid the delay
+	 * as some drivers create and destroy a lot of queues while
+	 * probing.  This is still safe because blk_release_queue() will be
+	 * called only after the queue refcnt drops to zero and nothing,
+	 * RCU or not, would be traversing the queue by then.
+	 */
 	q->bypass_depth++;
 	queue_flag_set(QUEUE_FLAG_BYPASS, q);
 
-- 
1.7.7.3

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Vivek Goyal]

On Fri, Apr 13, 2012 at 02:38:52PM -0700, Tejun Heo wrote:
> On Fri, Apr 13, 2012 at 05:33:44PM -0400, Vivek Goyal wrote:
> > On Fri, Apr 13, 2012 at 02:05:48PM -0700, Tejun Heo wrote:
> > > On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> > > > But neither seems to be the case here. So to make sure that blkg_lookup()
> > > > under rcu will see the updated value of queue flag (bypass), are we
> > > > relying on the fact that caller should see the DEAD flag and not go
> > > > ahead with blkg_lookup()?  If yes, atleast it is not obivious.
> > > 
> > > We're relying on the fact that it doesn't matter anymore because all
> > > blkgs will be shoot down in queue cleanup path which goes through rcu
> > > free, which is different from deactivating individual policies.  It
> > > indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
> > > hell was megaraid messing with so many queues anyways?
> > 
> > Well, blkcg_deactivate_policy() frees the policy data in a non-rcu
> > manner. So group is around but policy data is gone. So technically if some
> > IO submitter does not see the queue bypass flag, he might still try to
> > access blkg->pd[pol->plid] after being freed.
> 
> No, we always go through blkg_destroy_all() and each blkg along with
> any attached policy_data will go through RCU grace period before
> getting destroyed.  It is stupid subtle but nevertheless correct.

Ok, I see that we are calling blkg_destroy_all() before we call
blk_throtl_exit() or elevator_exit(). So yes, this should be fine.

Thanks
Vivek

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[James Bottomley]

On Fri, 2012-04-13 at 14:16 -0700, Tejun Heo wrote:
> On Fri, Apr 13, 2012 at 02:05:48PM -0700, Tejun Heo wrote:
> > On Fri, Apr 13, 2012 at 04:55:01PM -0400, Vivek Goyal wrote:
> > > But neither seems to be the case here. So to make sure that blkg_lookup()
> > > under rcu will see the updated value of queue flag (bypass), are we
> > > relying on the fact that caller should see the DEAD flag and not go
> > > ahead with blkg_lookup()?  If yes, atleast it is not obivious.
> > 
> > We're relying on the fact that it doesn't matter anymore because all
> > blkgs will be shoot down in queue cleanup path which goes through rcu
> > free, which is different from deactivating individual policies.  It
> > indeed is subtle.  Umm... this is starting to get ridiculous.  Why the
> > hell was megaraid messing with so many queues anyways?
> 
> I suppose megaraid depends on sequential LUN scan which SCSI
> implements by creating sdev for each LUN, trying to see whether it
> actually exists and then destroys the sdev if not.  Urgh.... so, we
> seem to be stuck with it.

Right, sorry ... it's not just megaraid, it's any SCSI-2 device.  The
standard says we have to probe the LUNs one at a time to see if they're
there.  SCSI-3 on supports the REPORT LUNS command which just returns a
list which obviates the need to probe on every one but not all older
(and USB to be frank) devices support this.

> So, the current code is technically correct although subtle like hell.
> We can RCU defer blk_put_queue() from blk_cleanup_queue() using
> call_rcu() to make clear that RCU grace period is necessary there.
> Any better ideas?

Not really ... except that perhaps we might redo LUN scanning to use
just a single queue, so repurpose the LUN underneath, but not destroy
the old queue and setup the new one?  It's a bit counter intuitive, but
it shouldn't be impossible.

James

Re: [PATCH 07/11] blkcg: make request_queue bypassing on allocation

[Tejun Heo]

On Tue, Apr 17, 2012 at 04:04:58PM +0400, James Bottomley wrote:
> > So, the current code is technically correct although subtle like hell.
> > We can RCU defer blk_put_queue() from blk_cleanup_queue() using
> > call_rcu() to make clear that RCU grace period is necessary there.
> > Any better ideas?
> 
> Not really ... except that perhaps we might redo LUN scanning to use
> just a single queue, so repurpose the LUN underneath, but not destroy
> the old queue and setup the new one?  It's a bit counter intuitive, but
> it shouldn't be impossible.

I think we're fine as-is with comment explaining that there can't be
any active dereferencing going on by the time release is reached.

Thanks.

-- 
tejun

Re: [PATCHSET] block: per-queue policy activation, take#2

[Jens Axboe]

On Fri, Apr 13 2012, Tejun Heo wrote:
> Hello,
> 
> Upto now, blkcg assumed that all policies are active on all queues
> which simply isn't true - cfq policy is only applicable to queues
> which are using cfq as the elevator.  Also, for transition purposes,
> the current implementation clears all !root blkgs blkgs across
> elevator switch and policy [de]registration in racy manner.
> 
> This patchset implements per-queue policy activation.  Static policy
> ID is replaced with dynamic registration and each policy should be
> activated and deactivated explicitly on each queue.  On activation,
> the matching policy data are created on all existing blkgs.  On
> deactivation, the matching policy data are removed from all existing
> blkgs.  blkg printing skips blkg-policy combination which is disabled
> and trying to configure a policy on a blkg which doesn't have the
> policy enabled would return -EINVAL instead of creating an unused
> dummy configuration.
> 
> Changes from the last take[L] are
> 
> * 0001 to fix config dependent build error / warnings added.
> 
> * More comments added to 0006 as suggested by Vivek.
> 
> * 0007 added to avoid boot time bypass delays.
> 
> * 0009 made cfq_init_queue() return garbage after alloc failure if
>   !CONFIG_CFQ_GROUP_IOSCHED.  Fixed.
> 
> * 0011 which shoots down all blkgs if no policy is activated added.
>   Suggested by Vivek.
> 
>  0001-cfq-fix-build-breakage-warnings.patch
>  0002-blkcg-kill-blkio_list-and-replace-blkio_list_lock-wi.patch
>  0003-blkcg-use-pol-instead-of-plid-in-update_root_blkg_pd.patch
>  0004-blkcg-remove-static-policy-ID-enums.patch
>  0005-blkcg-make-blkg_conf_prep-take-pol-and-return-with-q.patch
>  0006-blkcg-make-sure-blkg_lookup-returns-NULL-if-q-is-byp.patch
>  0007-blkcg-make-request_queue-bypassing-on-allocation.patch
>  0008-blkcg-add-request_queue-root_blkg.patch
>  0009-blkcg-implement-per-queue-policy-activation.patch
>  0010-blkcg-drop-stuff-unused-after-per-queue-policy-activ.patch
>  0011-blkcg-shoot-down-blkgs-if-all-policies-are-deactivat.patch
> 
> This patchset is on top of the current block/for-3.5/core 5bc4afb1ec
> "blkcg: drop BLKCG_STAT_{PRIV|POL|OFF} macros" and also available in
> the following git branch.

Applied. Even if we need a bit more churn on this one, we should get
things in gear and for-next updated at least.

-- 
Jens Axboe

Re: [PATCHSET] block: per-queue policy activation, take#2

[Jens Axboe]

[-- Attachment #1: Type: text/plain, Size: 2751 bytes --]

On 04/20/2012 10:09 AM, Jens Axboe wrote:
> On Fri, Apr 13 2012, Tejun Heo wrote:
>> Hello,
>>
>> Upto now, blkcg assumed that all policies are active on all queues
>> which simply isn't true - cfq policy is only applicable to queues
>> which are using cfq as the elevator.  Also, for transition purposes,
>> the current implementation clears all !root blkgs blkgs across
>> elevator switch and policy [de]registration in racy manner.
>>
>> This patchset implements per-queue policy activation.  Static policy
>> ID is replaced with dynamic registration and each policy should be
>> activated and deactivated explicitly on each queue.  On activation,
>> the matching policy data are created on all existing blkgs.  On
>> deactivation, the matching policy data are removed from all existing
>> blkgs.  blkg printing skips blkg-policy combination which is disabled
>> and trying to configure a policy on a blkg which doesn't have the
>> policy enabled would return -EINVAL instead of creating an unused
>> dummy configuration.
>>
>> Changes from the last take[L] are
>>
>> * 0001 to fix config dependent build error / warnings added.
>>
>> * More comments added to 0006 as suggested by Vivek.
>>
>> * 0007 added to avoid boot time bypass delays.
>>
>> * 0009 made cfq_init_queue() return garbage after alloc failure if
>>   !CONFIG_CFQ_GROUP_IOSCHED.  Fixed.
>>
>> * 0011 which shoots down all blkgs if no policy is activated added.
>>   Suggested by Vivek.
>>
>>  0001-cfq-fix-build-breakage-warnings.patch
>>  0002-blkcg-kill-blkio_list-and-replace-blkio_list_lock-wi.patch
>>  0003-blkcg-use-pol-instead-of-plid-in-update_root_blkg_pd.patch
>>  0004-blkcg-remove-static-policy-ID-enums.patch
>>  0005-blkcg-make-blkg_conf_prep-take-pol-and-return-with-q.patch
>>  0006-blkcg-make-sure-blkg_lookup-returns-NULL-if-q-is-byp.patch
>>  0007-blkcg-make-request_queue-bypassing-on-allocation.patch
>>  0008-blkcg-add-request_queue-root_blkg.patch
>>  0009-blkcg-implement-per-queue-policy-activation.patch
>>  0010-blkcg-drop-stuff-unused-after-per-queue-policy-activ.patch
>>  0011-blkcg-shoot-down-blkgs-if-all-policies-are-deactivat.patch
>>
>> This patchset is on top of the current block/for-3.5/core 5bc4afb1ec
>> "blkcg: drop BLKCG_STAT_{PRIV|POL|OFF} macros" and also available in
>> the following git branch.
> 
> Applied. Even if we need a bit more churn on this one, we should get
> things in gear and for-next updated at least.

Tejun, everything merged in cleanly. A boot test didn't not go so well,
I'm afraid. It complains about stuck RCU. Even with extra RCU
debugging/info turned on, it doesn't give my any extra info.

Config is attached. I can try and debug this on Monday, for now I've
pulled it out of for-next again.

-- 
Jens Axboe


[-- Attachment #2: config --]
[-- Type: text/plain, Size: 73776 bytes --]

#
# Automatically generated file; DO NOT EDIT.
# Linux/x86_64 3.4.0-rc3 Kernel Configuration
#
CONFIG_64BIT=y
# CONFIG_X86_32 is not set
CONFIG_X86_64=y
CONFIG_X86=y
CONFIG_INSTRUCTION_DECODER=y
CONFIG_OUTPUT_FORMAT="elf64-x86-64"
CONFIG_ARCH_DEFCONFIG="arch/x86/configs/x86_64_defconfig"
CONFIG_GENERIC_CMOS_UPDATE=y
CONFIG_CLOCKSOURCE_WATCHDOG=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_ARCH_CLOCKSOURCE_DATA=y
CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_LATENCYTOP_SUPPORT=y
CONFIG_MMU=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_NEED_SG_DMA_LENGTH=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_BUG=y
CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
# CONFIG_RWSEM_GENERIC_SPINLOCK is not set
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_GENERIC_TIME_VSYSCALL=y
CONFIG_ARCH_HAS_CPU_RELAX=y
CONFIG_ARCH_HAS_DEFAULT_IDLE=y
CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
CONFIG_ARCH_HAS_CPU_AUTOPROBE=y
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
CONFIG_ARCH_HIBERNATION_POSSIBLE=y
CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_ZONE_DMA32=y
CONFIG_AUDIT_ARCH=y
CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y
CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
CONFIG_HAVE_INTEL_TXT=y
CONFIG_X86_64_SMP=y
CONFIG_X86_HT=y
CONFIG_ARCH_HWEIGHT_CFLAGS="-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11"
# CONFIG_KTIME_SCALAR is not set
CONFIG_ARCH_CPU_PROBE_RELEASE=y
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_HAVE_IRQ_WORK=y
CONFIG_IRQ_WORK=y

#
# General setup
#
CONFIG_EXPERIMENTAL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_CROSS_COMPILE=""
CONFIG_LOCALVERSION=""
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_BZIP2=y
CONFIG_HAVE_KERNEL_LZMA=y
CONFIG_HAVE_KERNEL_XZ=y
CONFIG_HAVE_KERNEL_LZO=y
CONFIG_KERNEL_GZIP=y
# CONFIG_KERNEL_BZIP2 is not set
# CONFIG_KERNEL_LZMA is not set
# CONFIG_KERNEL_XZ is not set
# CONFIG_KERNEL_LZO is not set
CONFIG_DEFAULT_HOSTNAME="nelson.home.kernel.dk"
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_POSIX_MQUEUE=y
CONFIG_POSIX_MQUEUE_SYSCTL=y
# CONFIG_BSD_PROCESS_ACCT is not set
# CONFIG_FHANDLE is not set
CONFIG_TASKSTATS=y
CONFIG_TASK_DELAY_ACCT=y
# CONFIG_TASK_XACCT is not set
# CONFIG_AUDIT is not set
CONFIG_HAVE_GENERIC_HARDIRQS=y

#
# IRQ subsystem
#
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_IRQ_SHOW=y
CONFIG_GENERIC_PENDING_IRQ=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_SPARSE_IRQ=y

#
# RCU Subsystem
#
CONFIG_TREE_PREEMPT_RCU=y
CONFIG_PREEMPT_RCU=y
CONFIG_RCU_FANOUT=64
# CONFIG_RCU_FANOUT_EXACT is not set
# CONFIG_RCU_FAST_NO_HZ is not set
# CONFIG_TREE_RCU_TRACE is not set
# CONFIG_RCU_BOOST is not set
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=18
CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
CONFIG_CGROUPS=y
# CONFIG_CGROUP_DEBUG is not set
# CONFIG_CGROUP_FREEZER is not set
# CONFIG_CGROUP_DEVICE is not set
# CONFIG_CPUSETS is not set
# CONFIG_CGROUP_CPUACCT is not set
# CONFIG_RESOURCE_COUNTERS is not set
# CONFIG_CGROUP_PERF is not set
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
# CONFIG_CFS_BANDWIDTH is not set
# CONFIG_RT_GROUP_SCHED is not set
# CONFIG_BLK_CGROUP is not set
# CONFIG_CHECKPOINT_RESTORE is not set
CONFIG_NAMESPACES=y
# CONFIG_UTS_NS is not set
# CONFIG_IPC_NS is not set
# CONFIG_USER_NS is not set
# CONFIG_PID_NS is not set
# CONFIG_NET_NS is not set
CONFIG_SCHED_AUTOGROUP=y
# CONFIG_SYSFS_DEPRECATED is not set
CONFIG_RELAY=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_RD_GZIP=y
# CONFIG_RD_BZIP2 is not set
# CONFIG_RD_LZMA is not set
# CONFIG_RD_XZ is not set
# CONFIG_RD_LZO is not set
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_SYSCTL=y
CONFIG_ANON_INODES=y
CONFIG_EXPERT=y
CONFIG_UID16=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS=y
CONFIG_KALLSYMS_ALL=y
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_PCSPKR_PLATFORM=y
CONFIG_HAVE_PCSPKR_PLATFORM=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_AIO=y
CONFIG_EMBEDDED=y
CONFIG_HAVE_PERF_EVENTS=y

#
# Kernel Performance Events And Counters
#
CONFIG_PERF_EVENTS=y
CONFIG_PERF_COUNTERS=y
# CONFIG_DEBUG_PERF_USE_VMALLOC is not set
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_PCI_QUIRKS=y
CONFIG_COMPAT_BRK=y
CONFIG_SLAB=y
# CONFIG_SLUB is not set
# CONFIG_SLOB is not set
CONFIG_PROFILING=y
CONFIG_TRACEPOINTS=y
CONFIG_OPROFILE=m
# CONFIG_OPROFILE_EVENT_MULTIPLEX is not set
CONFIG_HAVE_OPROFILE=y
CONFIG_OPROFILE_NMI_TIMER=y
CONFIG_KPROBES=y
CONFIG_JUMP_LABEL=y
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
CONFIG_KRETPROBES=y
CONFIG_USER_RETURN_NOTIFIER=y
CONFIG_HAVE_IOREMAP_PROT=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_HAVE_OPTPROBES=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
CONFIG_HAVE_DMA_ATTRS=y
CONFIG_USE_GENERIC_SMP_HELPERS=y
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
CONFIG_HAVE_DMA_API_DEBUG=y
CONFIG_HAVE_HW_BREAKPOINT=y
CONFIG_HAVE_MIXED_BREAKPOINTS_REGS=y
CONFIG_HAVE_USER_RETURN_NOTIFIER=y
CONFIG_HAVE_PERF_EVENTS_NMI=y
CONFIG_HAVE_ARCH_JUMP_LABEL=y
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
CONFIG_HAVE_CMPXCHG_LOCAL=y
CONFIG_HAVE_CMPXCHG_DOUBLE=y
CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y

#
# GCOV-based kernel profiling
#
# CONFIG_GCOV_KERNEL is not set
# CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
CONFIG_SLABINFO=y
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
CONFIG_MODULES=y
# CONFIG_MODULE_FORCE_LOAD is not set
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
# CONFIG_MODVERSIONS is not set
# CONFIG_MODULE_SRCVERSION_ALL is not set
CONFIG_STOP_MACHINE=y
CONFIG_BLOCK=y
CONFIG_BLK_DEV_BSG=y
CONFIG_BLK_DEV_BSGLIB=y
# CONFIG_BLK_DEV_INTEGRITY is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y
CONFIG_BLOCK_COMPAT=y

#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=m
CONFIG_IOSCHED_CFQ=y
CONFIG_DEFAULT_CFQ=y
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_PREEMPT_NOTIFIERS=y
# CONFIG_INLINE_SPIN_TRYLOCK is not set
# CONFIG_INLINE_SPIN_TRYLOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK is not set
# CONFIG_INLINE_SPIN_LOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK_IRQ is not set
# CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set
CONFIG_UNINLINE_SPIN_UNLOCK=y
# CONFIG_INLINE_SPIN_UNLOCK_BH is not set
# CONFIG_INLINE_SPIN_UNLOCK_IRQ is not set
# CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set
# CONFIG_INLINE_READ_TRYLOCK is not set
# CONFIG_INLINE_READ_LOCK is not set
# CONFIG_INLINE_READ_LOCK_BH is not set
# CONFIG_INLINE_READ_LOCK_IRQ is not set
# CONFIG_INLINE_READ_LOCK_IRQSAVE is not set
# CONFIG_INLINE_READ_UNLOCK is not set
# CONFIG_INLINE_READ_UNLOCK_BH is not set
# CONFIG_INLINE_READ_UNLOCK_IRQ is not set
# CONFIG_INLINE_READ_UNLOCK_IRQRESTORE is not set
# CONFIG_INLINE_WRITE_TRYLOCK is not set
# CONFIG_INLINE_WRITE_LOCK is not set
# CONFIG_INLINE_WRITE_LOCK_BH is not set
# CONFIG_INLINE_WRITE_LOCK_IRQ is not set
# CONFIG_INLINE_WRITE_LOCK_IRQSAVE is not set
# CONFIG_INLINE_WRITE_UNLOCK is not set
# CONFIG_INLINE_WRITE_UNLOCK_BH is not set
# CONFIG_INLINE_WRITE_UNLOCK_IRQ is not set
# CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE is not set
CONFIG_MUTEX_SPIN_ON_OWNER=y
CONFIG_FREEZER=y

#
# Processor type and features
#
CONFIG_ZONE_DMA=y
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y
CONFIG_SMP=y
CONFIG_X86_X2APIC=y
CONFIG_X86_MPPARSE=y
# CONFIG_X86_EXTENDED_PLATFORM is not set
CONFIG_X86_SUPPORTS_MEMORY_FAILURE=y
CONFIG_SCHED_OMIT_FRAME_POINTER=y
# CONFIG_PARAVIRT_GUEST is not set
CONFIG_NO_BOOTMEM=y
# CONFIG_MEMTEST is not set
# CONFIG_MK8 is not set
# CONFIG_MPSC is not set
CONFIG_MCORE2=y
# CONFIG_MATOM is not set
# CONFIG_GENERIC_CPU is not set
CONFIG_X86_INTERNODE_CACHE_SHIFT=6
CONFIG_X86_CMPXCHG=y
CONFIG_X86_L1_CACHE_SHIFT=6
CONFIG_X86_XADD=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_P6_NOP=y
CONFIG_X86_TSC=y
CONFIG_X86_CMPXCHG64=y
CONFIG_X86_CMOV=y
CONFIG_X86_MINIMUM_CPU_FAMILY=64
CONFIG_X86_DEBUGCTLMSR=y
CONFIG_PROCESSOR_SELECT=y
CONFIG_CPU_SUP_INTEL=y
CONFIG_CPU_SUP_AMD=y
# CONFIG_CPU_SUP_CENTAUR is not set
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_DMI=y
CONFIG_GART_IOMMU=y
# CONFIG_CALGARY_IOMMU is not set
CONFIG_SWIOTLB=y
CONFIG_IOMMU_HELPER=y
# CONFIG_MAXSMP is not set
CONFIG_NR_CPUS=16
# CONFIG_SCHED_SMT is not set
CONFIG_SCHED_MC=y
# CONFIG_IRQ_TIME_ACCOUNTING is not set
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT=y
CONFIG_PREEMPT_COUNT=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
# CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS is not set
CONFIG_X86_MCE=y
CONFIG_X86_MCE_INTEL=y
# CONFIG_X86_MCE_AMD is not set
CONFIG_X86_MCE_THRESHOLD=y
# CONFIG_X86_MCE_INJECT is not set
CONFIG_X86_THERMAL_VECTOR=y
# CONFIG_I8K is not set
# CONFIG_MICROCODE is not set
CONFIG_X86_MSR=y
CONFIG_X86_CPUID=y
CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
CONFIG_ARCH_DMA_ADDR_T_64BIT=y
# CONFIG_DIRECT_GBPAGES is not set
# CONFIG_NUMA is not set
CONFIG_ARCH_SPARSEMEM_ENABLE=y
CONFIG_ARCH_SPARSEMEM_DEFAULT=y
CONFIG_ARCH_SELECT_MEMORY_MODEL=y
CONFIG_ARCH_PROC_KCORE_TEXT=y
CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_SPARSEMEM_MANUAL=y
CONFIG_SPARSEMEM=y
CONFIG_HAVE_MEMORY_PRESENT=y
CONFIG_SPARSEMEM_EXTREME=y
CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER=y
CONFIG_SPARSEMEM_VMEMMAP=y
CONFIG_HAVE_MEMBLOCK=y
CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
CONFIG_ARCH_DISCARD_MEMBLOCK=y
# CONFIG_MEMORY_HOTPLUG is not set
CONFIG_PAGEFLAGS_EXTENDED=y
CONFIG_SPLIT_PTLOCK_CPUS=4
# CONFIG_COMPACTION is not set
CONFIG_PHYS_ADDR_T_64BIT=y
CONFIG_ZONE_DMA_FLAG=1
CONFIG_BOUNCE=y
CONFIG_VIRT_TO_BUS=y
CONFIG_MMU_NOTIFIER=y
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_ARCH_SUPPORTS_MEMORY_FAILURE=y
# CONFIG_MEMORY_FAILURE is not set
# CONFIG_TRANSPARENT_HUGEPAGE is not set
# CONFIG_CLEANCACHE is not set
# CONFIG_X86_CHECK_BIOS_CORRUPTION is not set
CONFIG_X86_RESERVE_LOW=64
CONFIG_MTRR=y
# CONFIG_MTRR_SANITIZER is not set
# CONFIG_X86_PAT is not set
CONFIG_ARCH_RANDOM=y
# CONFIG_EFI is not set
# CONFIG_SECCOMP is not set
# CONFIG_CC_STACKPROTECTOR is not set
# CONFIG_HZ_100 is not set
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_SCHED_HRTICK=y
# CONFIG_KEXEC is not set
# CONFIG_CRASH_DUMP is not set
CONFIG_PHYSICAL_START=0x200000
# CONFIG_RELOCATABLE is not set
CONFIG_PHYSICAL_ALIGN=0x1000000
CONFIG_HOTPLUG_CPU=y
# CONFIG_COMPAT_VDSO is not set
# CONFIG_CMDLINE_BOOL is not set
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y

#
# Power management and ACPI options
#
CONFIG_ARCH_HIBERNATION_HEADER=y
CONFIG_SUSPEND=y
CONFIG_SUSPEND_FREEZER=y
CONFIG_HIBERNATE_CALLBACKS=y
CONFIG_HIBERNATION=y
CONFIG_PM_STD_PARTITION="/dev/sdb8"
CONFIG_PM_SLEEP=y
CONFIG_PM_SLEEP_SMP=y
CONFIG_PM_RUNTIME=y
CONFIG_PM=y
# CONFIG_PM_DEBUG is not set
CONFIG_ACPI=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_PROCFS=y
CONFIG_ACPI_PROCFS_POWER=y
# CONFIG_ACPI_EC_DEBUGFS is not set
CONFIG_ACPI_PROC_EVENT=y
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_FAN=y
# CONFIG_ACPI_DOCK is not set
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_HOTPLUG_CPU=y
# CONFIG_ACPI_PROCESSOR_AGGREGATOR is not set
CONFIG_ACPI_THERMAL=y
# CONFIG_ACPI_CUSTOM_DSDT is not set
CONFIG_ACPI_BLACKLIST_YEAR=0
CONFIG_ACPI_DEBUG=y
# CONFIG_ACPI_DEBUG_FUNC_TRACE is not set
# CONFIG_ACPI_PCI_SLOT is not set
CONFIG_X86_PM_TIMER=y
CONFIG_ACPI_CONTAINER=y
# CONFIG_ACPI_SBS is not set
# CONFIG_ACPI_HED is not set
# CONFIG_ACPI_CUSTOM_METHOD is not set
# CONFIG_ACPI_BGRT is not set
# CONFIG_ACPI_APEI is not set
# CONFIG_SFI is not set

#
# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_TABLE=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_STAT_DETAILS=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set

#
# x86 CPU frequency scaling drivers
#
# CONFIG_X86_PCC_CPUFREQ is not set
CONFIG_X86_ACPI_CPUFREQ=y
# CONFIG_X86_POWERNOW_K8 is not set
# CONFIG_X86_SPEEDSTEP_CENTRINO is not set
# CONFIG_X86_P4_CLOCKMOD is not set

#
# shared options
#
# CONFIG_X86_SPEEDSTEP_LIB is not set
CONFIG_CPU_IDLE=y
CONFIG_CPU_IDLE_GOV_LADDER=y
CONFIG_CPU_IDLE_GOV_MENU=y
# CONFIG_INTEL_IDLE is not set

#
# Memory power savings
#
# CONFIG_I7300_IDLE is not set

#
# Bus options (PCI etc.)
#
CONFIG_PCI=y
CONFIG_PCI_DIRECT=y
CONFIG_PCI_MMCONFIG=y
CONFIG_PCI_DOMAINS=y
# CONFIG_PCI_CNB20LE_QUIRK is not set
CONFIG_PCIEPORTBUS=y
CONFIG_HOTPLUG_PCI_PCIE=m
CONFIG_PCIEAER=y
# CONFIG_PCIE_ECRC is not set
# CONFIG_PCIEAER_INJECT is not set
CONFIG_PCIEASPM=y
# CONFIG_PCIEASPM_DEBUG is not set
CONFIG_PCIEASPM_DEFAULT=y
# CONFIG_PCIEASPM_POWERSAVE is not set
# CONFIG_PCIEASPM_PERFORMANCE is not set
CONFIG_PCIE_PME=y
CONFIG_ARCH_SUPPORTS_MSI=y
CONFIG_PCI_MSI=y
# CONFIG_PCI_DEBUG is not set
# CONFIG_PCI_REALLOC_ENABLE_AUTO is not set
# CONFIG_PCI_STUB is not set
CONFIG_HT_IRQ=y
# CONFIG_PCI_IOV is not set
# CONFIG_PCI_PRI is not set
# CONFIG_PCI_PASID is not set
CONFIG_PCI_IOAPIC=y
CONFIG_PCI_LABEL=y
CONFIG_ISA_DMA_API=y
CONFIG_AMD_NB=y
# CONFIG_PCCARD is not set
CONFIG_HOTPLUG_PCI=y
# CONFIG_HOTPLUG_PCI_FAKE is not set
CONFIG_HOTPLUG_PCI_ACPI=m
# CONFIG_HOTPLUG_PCI_ACPI_IBM is not set
# CONFIG_HOTPLUG_PCI_CPCI is not set
# CONFIG_HOTPLUG_PCI_SHPC is not set
# CONFIG_RAPIDIO is not set

#
# Executable file formats / Emulations
#
CONFIG_BINFMT_ELF=y
CONFIG_COMPAT_BINFMT_ELF=y
CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE=y
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
CONFIG_IA32_EMULATION=y
CONFIG_IA32_AOUT=y
# CONFIG_X86_X32 is not set
CONFIG_COMPAT=y
CONFIG_COMPAT_FOR_U64_ALIGNMENT=y
CONFIG_SYSVIPC_COMPAT=y
CONFIG_HAVE_TEXT_POKE_SMP=y
CONFIG_NET=y
CONFIG_COMPAT_NETLINK_MESSAGES=y

#
# Networking options
#
CONFIG_PACKET=y
CONFIG_UNIX=y
# CONFIG_UNIX_DIAG is not set
CONFIG_XFRM=y
# CONFIG_XFRM_USER is not set
# CONFIG_XFRM_SUB_POLICY is not set
# CONFIG_XFRM_MIGRATE is not set
# CONFIG_XFRM_STATISTICS is not set
# CONFIG_NET_KEY is not set
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
# CONFIG_IP_ADVANCED_ROUTER is not set
# CONFIG_IP_PNP is not set
# CONFIG_NET_IPIP is not set
# CONFIG_NET_IPGRE_DEMUX is not set
# CONFIG_IP_MROUTE is not set
# CONFIG_ARPD is not set
# CONFIG_SYN_COOKIES is not set
# CONFIG_INET_AH is not set
# CONFIG_INET_ESP is not set
# CONFIG_INET_IPCOMP is not set
# CONFIG_INET_XFRM_TUNNEL is not set
# CONFIG_INET_TUNNEL is not set
CONFIG_INET_XFRM_MODE_TRANSPORT=y
CONFIG_INET_XFRM_MODE_TUNNEL=y
# CONFIG_INET_XFRM_MODE_BEET is not set
# CONFIG_INET_LRO is not set
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
# CONFIG_INET_UDP_DIAG is not set
# CONFIG_TCP_CONG_ADVANCED is not set
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
# CONFIG_TCP_MD5SIG is not set
# CONFIG_IPV6 is not set
# CONFIG_NETWORK_SECMARK is not set
# CONFIG_NETWORK_PHY_TIMESTAMPING is not set
# CONFIG_NETFILTER is not set
# CONFIG_IP_DCCP is not set
# CONFIG_IP_SCTP is not set
# CONFIG_RDS is not set
# CONFIG_TIPC is not set
# CONFIG_ATM is not set
# CONFIG_L2TP is not set
CONFIG_STP=m
CONFIG_BRIDGE=m
CONFIG_BRIDGE_IGMP_SNOOPING=y
# CONFIG_NET_DSA is not set
# CONFIG_VLAN_8021Q is not set
# CONFIG_DECNET is not set
CONFIG_LLC=m
# CONFIG_LLC2 is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_ECONET is not set
# CONFIG_WAN_ROUTER is not set
# CONFIG_PHONET is not set
# CONFIG_IEEE802154 is not set
# CONFIG_NET_SCHED is not set
# CONFIG_DCB is not set
# CONFIG_BATMAN_ADV is not set
# CONFIG_OPENVSWITCH is not set
CONFIG_RPS=y
CONFIG_RFS_ACCEL=y
CONFIG_XPS=y
# CONFIG_NETPRIO_CGROUP is not set
CONFIG_BQL=y
CONFIG_HAVE_BPF_JIT=y
# CONFIG_BPF_JIT is not set

#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
# CONFIG_NET_TCPPROBE is not set
# CONFIG_NET_DROP_MONITOR is not set
# CONFIG_HAMRADIO is not set
# CONFIG_CAN is not set
# CONFIG_IRDA is not set
# CONFIG_BT is not set
# CONFIG_AF_RXRPC is not set
CONFIG_WIRELESS=y
CONFIG_WEXT_CORE=y
CONFIG_WEXT_PROC=y
CONFIG_CFG80211=y
# CONFIG_NL80211_TESTMODE is not set
# CONFIG_CFG80211_DEVELOPER_WARNINGS is not set
# CONFIG_CFG80211_REG_DEBUG is not set
# CONFIG_CFG80211_DEFAULT_PS is not set
CONFIG_CFG80211_DEBUGFS=y
# CONFIG_CFG80211_INTERNAL_REGDB is not set
CONFIG_CFG80211_WEXT=y
CONFIG_WIRELESS_EXT_SYSFS=y
CONFIG_LIB80211=y
# CONFIG_LIB80211_DEBUG is not set
CONFIG_MAC80211=y
CONFIG_MAC80211_HAS_RC=y
# CONFIG_MAC80211_RC_PID is not set
CONFIG_MAC80211_RC_MINSTREL=y
CONFIG_MAC80211_RC_MINSTREL_HT=y
CONFIG_MAC80211_RC_DEFAULT_MINSTREL=y
CONFIG_MAC80211_RC_DEFAULT="minstrel_ht"
# CONFIG_MAC80211_MESH is not set
# CONFIG_MAC80211_DEBUGFS is not set
# CONFIG_MAC80211_DEBUG_MENU is not set
# CONFIG_WIMAX is not set
# CONFIG_RFKILL is not set
# CONFIG_NET_9P is not set
# CONFIG_CAIF is not set
# CONFIG_CEPH_LIB is not set
# CONFIG_NFC is not set

#
# Device Drivers
#

#
# Generic Driver Options
#
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_SYS_HYPERVISOR is not set
# CONFIG_GENERIC_CPU_DEVICES is not set
CONFIG_DMA_SHARED_BUFFER=y
# CONFIG_CONNECTOR is not set
# CONFIG_MTD is not set
# CONFIG_PARPORT is not set
CONFIG_PNP=y
CONFIG_PNP_DEBUG_MESSAGES=y

#
# Protocols
#
CONFIG_PNPACPI=y
CONFIG_BLK_DEV=y
# CONFIG_BLK_DEV_FD is not set
CONFIG_BLK_DEV_PCIESSD_MTIP32XX=m
# CONFIG_BLK_CPQ_DA is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_DAC960 is not set
# CONFIG_BLK_DEV_UMEM is not set
# CONFIG_BLK_DEV_COW_COMMON is not set
CONFIG_BLK_DEV_LOOP=m
CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
# CONFIG_BLK_DEV_CRYPTOLOOP is not set

#
# DRBD disabled because PROC_FS, INET or CONNECTOR not selected
#
# CONFIG_BLK_DEV_NBD is not set
# CONFIG_BLK_DEV_NVME is not set
# CONFIG_BLK_DEV_SX8 is not set
# CONFIG_BLK_DEV_UB is not set
# CONFIG_BLK_DEV_RAM is not set
# CONFIG_CDROM_PKTCDVD is not set
# CONFIG_ATA_OVER_ETH is not set
# CONFIG_BLK_DEV_HD is not set
# CONFIG_BLK_DEV_RBD is not set

#
# Misc devices
#
# CONFIG_SENSORS_LIS3LV02D is not set
# CONFIG_AD525X_DPOT is not set
# CONFIG_IBM_ASM is not set
# CONFIG_PHANTOM is not set
# CONFIG_INTEL_MID_PTI is not set
# CONFIG_SGI_IOC4 is not set
# CONFIG_TIFM_CORE is not set
# CONFIG_ICS932S401 is not set
# CONFIG_ENCLOSURE_SERVICES is not set
# CONFIG_HP_ILO is not set
# CONFIG_APDS9802ALS is not set
# CONFIG_ISL29003 is not set
# CONFIG_ISL29020 is not set
# CONFIG_SENSORS_TSL2550 is not set
# CONFIG_SENSORS_BH1780 is not set
# CONFIG_SENSORS_BH1770 is not set
# CONFIG_SENSORS_APDS990X is not set
# CONFIG_HMC6352 is not set
# CONFIG_DS1682 is not set
# CONFIG_VMWARE_BALLOON is not set
# CONFIG_BMP085 is not set
# CONFIG_PCH_PHUB is not set
# CONFIG_USB_SWITCH_FSA9480 is not set
# CONFIG_C2PORT is not set

#
# EEPROM support
#
# CONFIG_EEPROM_AT24 is not set
# CONFIG_EEPROM_LEGACY is not set
# CONFIG_EEPROM_MAX6875 is not set
# CONFIG_EEPROM_93CX6 is not set
# CONFIG_CB710_CORE is not set

#
# Texas Instruments shared transport line discipline
#
# CONFIG_SENSORS_LIS3_I2C is not set

#
# Altera FPGA firmware download module
#
# CONFIG_ALTERA_STAPL is not set
CONFIG_HAVE_IDE=y
# CONFIG_IDE is not set

#
# SCSI device support
#
CONFIG_SCSI_MOD=y
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
# CONFIG_SCSI_TGT is not set
CONFIG_SCSI_NETLINK=y
# CONFIG_SCSI_PROC_FS is not set

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
# CONFIG_CHR_DEV_OSST is not set
CONFIG_BLK_DEV_SR=m
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_CHR_DEV_SG=m
# CONFIG_CHR_DEV_SCH is not set
CONFIG_SCSI_MULTI_LUN=y
# CONFIG_SCSI_CONSTANTS is not set
# CONFIG_SCSI_LOGGING is not set
# CONFIG_SCSI_SCAN_ASYNC is not set
CONFIG_SCSI_WAIT_SCAN=m

#
# SCSI Transports
#
CONFIG_SCSI_SPI_ATTRS=y
CONFIG_SCSI_FC_ATTRS=y
# CONFIG_SCSI_ISCSI_ATTRS is not set
CONFIG_SCSI_SAS_ATTRS=m
# CONFIG_SCSI_SAS_LIBSAS is not set
# CONFIG_SCSI_SRP_ATTRS is not set
CONFIG_SCSI_LOWLEVEL=y
# CONFIG_ISCSI_TCP is not set
# CONFIG_ISCSI_BOOT_SYSFS is not set
# CONFIG_SCSI_CXGB3_ISCSI is not set
# CONFIG_SCSI_CXGB4_ISCSI is not set
# CONFIG_SCSI_BNX2_ISCSI is not set
# CONFIG_SCSI_BNX2X_FCOE is not set
# CONFIG_BE2ISCSI is not set
# CONFIG_BLK_DEV_3W_XXXX_RAID is not set
# CONFIG_SCSI_HPSA is not set
# CONFIG_SCSI_3W_9XXX is not set
# CONFIG_SCSI_3W_SAS is not set
# CONFIG_SCSI_ACARD is not set
# CONFIG_SCSI_AACRAID is not set
# CONFIG_SCSI_AIC7XXX is not set
# CONFIG_SCSI_AIC7XXX_OLD is not set
# CONFIG_SCSI_AIC79XX is not set
# CONFIG_SCSI_AIC94XX is not set
# CONFIG_SCSI_MVSAS is not set
# CONFIG_SCSI_MVUMI is not set
# CONFIG_SCSI_DPT_I2O is not set
# CONFIG_SCSI_ADVANSYS is not set
# CONFIG_SCSI_ARCMSR is not set
# CONFIG_MEGARAID_NEWGEN is not set
# CONFIG_MEGARAID_LEGACY is not set
# CONFIG_MEGARAID_SAS is not set
# CONFIG_SCSI_MPT2SAS is not set
# CONFIG_SCSI_UFSHCD is not set
# CONFIG_SCSI_HPTIOP is not set
# CONFIG_SCSI_BUSLOGIC is not set
# CONFIG_VMWARE_PVSCSI is not set
# CONFIG_LIBFC is not set
# CONFIG_LIBFCOE is not set
# CONFIG_FCOE is not set
# CONFIG_FCOE_FNIC is not set
# CONFIG_SCSI_DMX3191D is not set
# CONFIG_SCSI_EATA is not set
# CONFIG_SCSI_FUTURE_DOMAIN is not set
# CONFIG_SCSI_GDTH is not set
# CONFIG_SCSI_ISCI is not set
# CONFIG_SCSI_IPS is not set
# CONFIG_SCSI_INITIO is not set
# CONFIG_SCSI_INIA100 is not set
# CONFIG_SCSI_STEX is not set
# CONFIG_SCSI_SYM53C8XX_2 is not set
# CONFIG_SCSI_IPR is not set
# CONFIG_SCSI_QLOGIC_1280 is not set
# CONFIG_SCSI_QLA_FC is not set
# CONFIG_SCSI_QLA_ISCSI is not set
# CONFIG_SCSI_LPFC is not set
# CONFIG_SCSI_DC395x is not set
# CONFIG_SCSI_DC390T is not set
# CONFIG_SCSI_DEBUG is not set
# CONFIG_SCSI_PMCRAID is not set
# CONFIG_SCSI_PM8001 is not set
# CONFIG_SCSI_SRP is not set
# CONFIG_SCSI_BFA_FC is not set
# CONFIG_SCSI_DH is not set
# CONFIG_SCSI_OSD_INITIATOR is not set
CONFIG_ATA=y
# CONFIG_ATA_NONSTANDARD is not set
CONFIG_ATA_VERBOSE_ERROR=y
CONFIG_ATA_ACPI=y
# CONFIG_SATA_PMP is not set

#
# Controllers with non-SFF native interface
#
CONFIG_SATA_AHCI=y
# CONFIG_SATA_AHCI_PLATFORM is not set
# CONFIG_SATA_INIC162X is not set
# CONFIG_SATA_ACARD_AHCI is not set
# CONFIG_SATA_SIL24 is not set
CONFIG_ATA_SFF=y

#
# SFF controllers with custom DMA interface
#
# CONFIG_PDC_ADMA is not set
# CONFIG_SATA_QSTOR is not set
# CONFIG_SATA_SX4 is not set
CONFIG_ATA_BMDMA=y

#
# SATA SFF controllers with BMDMA
#
# CONFIG_ATA_PIIX is not set
# CONFIG_SATA_MV is not set
# CONFIG_SATA_NV is not set
# CONFIG_SATA_PROMISE is not set
# CONFIG_SATA_SIL is not set
# CONFIG_SATA_SIS is not set
# CONFIG_SATA_SVW is not set
# CONFIG_SATA_ULI is not set
# CONFIG_SATA_VIA is not set
# CONFIG_SATA_VITESSE is not set

#
# PATA SFF controllers with BMDMA
#
# CONFIG_PATA_ALI is not set
# CONFIG_PATA_AMD is not set
# CONFIG_PATA_ARTOP is not set
# CONFIG_PATA_ATIIXP is not set
# CONFIG_PATA_ATP867X is not set
# CONFIG_PATA_CMD64X is not set
# CONFIG_PATA_CS5520 is not set
# CONFIG_PATA_CS5530 is not set
# CONFIG_PATA_CS5536 is not set
# CONFIG_PATA_CYPRESS is not set
# CONFIG_PATA_EFAR is not set
# CONFIG_PATA_HPT366 is not set
# CONFIG_PATA_HPT37X is not set
# CONFIG_PATA_HPT3X2N is not set
# CONFIG_PATA_HPT3X3 is not set
# CONFIG_PATA_IT8213 is not set
# CONFIG_PATA_IT821X is not set
# CONFIG_PATA_JMICRON is not set
CONFIG_PATA_MARVELL=m
# CONFIG_PATA_NETCELL is not set
# CONFIG_PATA_NINJA32 is not set
# CONFIG_PATA_NS87415 is not set
# CONFIG_PATA_OLDPIIX is not set
# CONFIG_PATA_OPTIDMA is not set
# CONFIG_PATA_PDC2027X is not set
# CONFIG_PATA_PDC_OLD is not set
# CONFIG_PATA_RADISYS is not set
# CONFIG_PATA_RDC is not set
# CONFIG_PATA_SC1200 is not set
# CONFIG_PATA_SCH is not set
# CONFIG_PATA_SERVERWORKS is not set
# CONFIG_PATA_SIL680 is not set
# CONFIG_PATA_SIS is not set
# CONFIG_PATA_TOSHIBA is not set
# CONFIG_PATA_TRIFLEX is not set
# CONFIG_PATA_VIA is not set
# CONFIG_PATA_WINBOND is not set

#
# PIO-only SFF controllers
#
# CONFIG_PATA_CMD640_PCI is not set
# CONFIG_PATA_MPIIX is not set
# CONFIG_PATA_NS87410 is not set
# CONFIG_PATA_OPTI is not set
# CONFIG_PATA_PLATFORM is not set
# CONFIG_PATA_RZ1000 is not set

#
# Generic fallback / legacy drivers
#
# CONFIG_PATA_ACPI is not set
# CONFIG_ATA_GENERIC is not set
# CONFIG_PATA_LEGACY is not set
# CONFIG_MD is not set
# CONFIG_TARGET_CORE is not set
CONFIG_FUSION=y
# CONFIG_FUSION_SPI is not set
# CONFIG_FUSION_FC is not set
CONFIG_FUSION_SAS=m
CONFIG_FUSION_MAX_SGE=128
CONFIG_FUSION_CTL=m
# CONFIG_FUSION_LOGGING is not set

#
# IEEE 1394 (FireWire) support
#
CONFIG_FIREWIRE=y
CONFIG_FIREWIRE_OHCI=m
CONFIG_FIREWIRE_SBP2=m
# CONFIG_FIREWIRE_NET is not set
# CONFIG_FIREWIRE_NOSY is not set
# CONFIG_I2O is not set
# CONFIG_MACINTOSH_DRIVERS is not set
CONFIG_NETDEVICES=y
CONFIG_NET_CORE=y
# CONFIG_BONDING is not set
# CONFIG_DUMMY is not set
# CONFIG_EQUALIZER is not set
# CONFIG_NET_FC is not set
CONFIG_MII=y
# CONFIG_NET_TEAM is not set
# CONFIG_MACVLAN is not set
CONFIG_NETCONSOLE=y
CONFIG_NETPOLL=y
# CONFIG_NETPOLL_TRAP is not set
CONFIG_NET_POLL_CONTROLLER=y
CONFIG_TUN=m
# CONFIG_VETH is not set
# CONFIG_ARCNET is not set

#
# CAIF transport drivers
#
CONFIG_ETHERNET=y
# CONFIG_NET_VENDOR_3COM is not set
# CONFIG_NET_VENDOR_ADAPTEC is not set
CONFIG_NET_VENDOR_ALTEON=y
# CONFIG_ACENIC is not set
CONFIG_NET_VENDOR_AMD=y
# CONFIG_AMD8111_ETH is not set
# CONFIG_PCNET32 is not set
CONFIG_NET_VENDOR_ATHEROS=y
# CONFIG_ATL2 is not set
# CONFIG_ATL1 is not set
CONFIG_ATL1E=m
# CONFIG_ATL1C is not set
CONFIG_NET_VENDOR_BROADCOM=y
# CONFIG_B44 is not set
# CONFIG_BNX2 is not set
# CONFIG_CNIC is not set
CONFIG_TIGON3=m
# CONFIG_BNX2X is not set
CONFIG_NET_VENDOR_BROCADE=y
# CONFIG_BNA is not set
# CONFIG_NET_CALXEDA_XGMAC is not set
CONFIG_NET_VENDOR_CHELSIO=y
# CONFIG_CHELSIO_T1 is not set
# CONFIG_CHELSIO_T3 is not set
# CONFIG_CHELSIO_T4 is not set
# CONFIG_CHELSIO_T4VF is not set
CONFIG_NET_VENDOR_CISCO=y
# CONFIG_ENIC is not set
# CONFIG_DNET is not set
CONFIG_NET_VENDOR_DEC=y
# CONFIG_NET_TULIP is not set
CONFIG_NET_VENDOR_DLINK=y
# CONFIG_DL2K is not set
# CONFIG_SUNDANCE is not set
CONFIG_NET_VENDOR_EMULEX=y
# CONFIG_BE2NET is not set
CONFIG_NET_VENDOR_EXAR=y
# CONFIG_S2IO is not set
# CONFIG_VXGE is not set
CONFIG_NET_VENDOR_HP=y
# CONFIG_HP100 is not set
CONFIG_NET_VENDOR_INTEL=y
# CONFIG_E100 is not set
# CONFIG_E1000 is not set
CONFIG_E1000E=m
# CONFIG_IGB is not set
# CONFIG_IGBVF is not set
# CONFIG_IXGB is not set
# CONFIG_IXGBE is not set
# CONFIG_IXGBEVF is not set
CONFIG_NET_VENDOR_I825XX=y
# CONFIG_ZNET is not set
# CONFIG_IP1000 is not set
# CONFIG_JME is not set
CONFIG_NET_VENDOR_MARVELL=y
# CONFIG_SKGE is not set
# CONFIG_SKY2 is not set
CONFIG_NET_VENDOR_MELLANOX=y
# CONFIG_MLX4_EN is not set
# CONFIG_MLX4_CORE is not set
CONFIG_NET_VENDOR_MICREL=y
# CONFIG_KS8851_MLL is not set
# CONFIG_KSZ884X_PCI is not set
CONFIG_NET_VENDOR_MYRI=y
# CONFIG_MYRI10GE is not set
# CONFIG_FEALNX is not set
CONFIG_NET_VENDOR_NATSEMI=y
# CONFIG_NATSEMI is not set
# CONFIG_NS83820 is not set
CONFIG_NET_VENDOR_8390=y
# CONFIG_NE2K_PCI is not set
CONFIG_NET_VENDOR_NVIDIA=y
# CONFIG_FORCEDETH is not set
CONFIG_NET_VENDOR_OKI=y
# CONFIG_PCH_GBE is not set
# CONFIG_ETHOC is not set
# CONFIG_NET_PACKET_ENGINE is not set
CONFIG_NET_VENDOR_QLOGIC=y
# CONFIG_QLA3XXX is not set
# CONFIG_QLCNIC is not set
# CONFIG_QLGE is not set
# CONFIG_NETXEN_NIC is not set
CONFIG_NET_VENDOR_REALTEK=y
# CONFIG_8139CP is not set
# CONFIG_8139TOO is not set
# CONFIG_R8169 is not set
CONFIG_NET_VENDOR_RDC=y
# CONFIG_R6040 is not set
CONFIG_NET_VENDOR_SEEQ=y
# CONFIG_SEEQ8005 is not set
# CONFIG_NET_VENDOR_SILAN is not set
CONFIG_NET_VENDOR_SIS=y
# CONFIG_SIS900 is not set
# CONFIG_SIS190 is not set
# CONFIG_SFC is not set
CONFIG_NET_VENDOR_SMSC=y
# CONFIG_EPIC100 is not set
# CONFIG_SMSC9420 is not set
CONFIG_NET_VENDOR_STMICRO=y
# CONFIG_STMMAC_ETH is not set
CONFIG_NET_VENDOR_SUN=y
# CONFIG_HAPPYMEAL is not set
# CONFIG_SUNGEM is not set
# CONFIG_CASSINI is not set
# CONFIG_NIU is not set
CONFIG_NET_VENDOR_TEHUTI=y
# CONFIG_TEHUTI is not set
CONFIG_NET_VENDOR_TI=y
# CONFIG_TLAN is not set
CONFIG_NET_VENDOR_VIA=y
# CONFIG_VIA_RHINE is not set
# CONFIG_VIA_VELOCITY is not set
# CONFIG_FDDI is not set
# CONFIG_HIPPI is not set
# CONFIG_NET_SB1000 is not set
CONFIG_PHYLIB=y

#
# MII PHY device drivers
#
# CONFIG_AMD_PHY is not set
# CONFIG_MARVELL_PHY is not set
# CONFIG_DAVICOM_PHY is not set
# CONFIG_QSEMI_PHY is not set
# CONFIG_LXT_PHY is not set
# CONFIG_CICADA_PHY is not set
# CONFIG_VITESSE_PHY is not set
# CONFIG_SMSC_PHY is not set
# CONFIG_BROADCOM_PHY is not set
# CONFIG_ICPLUS_PHY is not set
# CONFIG_REALTEK_PHY is not set
# CONFIG_NATIONAL_PHY is not set
# CONFIG_STE10XP is not set
# CONFIG_LSI_ET1011C_PHY is not set
# CONFIG_MICREL_PHY is not set
# CONFIG_FIXED_PHY is not set
# CONFIG_MDIO_BITBANG is not set
# CONFIG_PPP is not set
# CONFIG_SLIP is not set
# CONFIG_TR is not set

#
# USB Network Adapters
#
# CONFIG_USB_CATC is not set
# CONFIG_USB_KAWETH is not set
# CONFIG_USB_PEGASUS is not set
# CONFIG_USB_RTL8150 is not set
CONFIG_USB_USBNET=m
CONFIG_USB_NET_AX8817X=m
CONFIG_USB_NET_CDCETHER=m
# CONFIG_USB_NET_CDC_EEM is not set
CONFIG_USB_NET_CDC_NCM=m
CONFIG_USB_NET_DM9601=m
# CONFIG_USB_NET_SMSC75XX is not set
CONFIG_USB_NET_SMSC95XX=m
CONFIG_USB_NET_GL620A=m
CONFIG_USB_NET_NET1080=m
CONFIG_USB_NET_PLUSB=m
CONFIG_USB_NET_MCS7830=m
CONFIG_USB_NET_RNDIS_HOST=m
CONFIG_USB_NET_CDC_SUBSET=m
CONFIG_USB_ALI_M5632=y
CONFIG_USB_AN2720=y
CONFIG_USB_BELKIN=y
CONFIG_USB_ARMLINUX=y
# CONFIG_USB_EPSON2888 is not set
# CONFIG_USB_KC2190 is not set
CONFIG_USB_NET_ZAURUS=m
# CONFIG_USB_NET_CX82310_ETH is not set
# CONFIG_USB_NET_KALMIA is not set
# CONFIG_USB_NET_QMI_WWAN is not set
# CONFIG_USB_NET_INT51X1 is not set
# CONFIG_USB_IPHETH is not set
CONFIG_USB_SIERRA_NET=m
# CONFIG_USB_VL600 is not set
# CONFIG_WLAN is not set

#
# Enable WiMAX (Networking options) to see the WiMAX drivers
#
# CONFIG_WAN is not set
# CONFIG_VMXNET3 is not set
# CONFIG_ISDN is not set

#
# Input device support
#
CONFIG_INPUT=y
# CONFIG_INPUT_FF_MEMLESS is not set
# CONFIG_INPUT_POLLDEV is not set
# CONFIG_INPUT_SPARSEKMAP is not set

#
# Userland interfaces
#
CONFIG_INPUT_MOUSEDEV=y
CONFIG_INPUT_MOUSEDEV_PSAUX=y
CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
# CONFIG_INPUT_JOYDEV is not set
CONFIG_INPUT_EVDEV=y
# CONFIG_INPUT_EVBUG is not set

#
# Input Device Drivers
#
CONFIG_INPUT_KEYBOARD=y
# CONFIG_KEYBOARD_ADP5588 is not set
# CONFIG_KEYBOARD_ADP5589 is not set
CONFIG_KEYBOARD_ATKBD=y
# CONFIG_KEYBOARD_QT1070 is not set
# CONFIG_KEYBOARD_QT2160 is not set
# CONFIG_KEYBOARD_LKKBD is not set
# CONFIG_KEYBOARD_TCA6416 is not set
# CONFIG_KEYBOARD_TCA8418 is not set
# CONFIG_KEYBOARD_MAX7359 is not set
# CONFIG_KEYBOARD_MCS is not set
# CONFIG_KEYBOARD_MPR121 is not set
# CONFIG_KEYBOARD_NEWTON is not set
# CONFIG_KEYBOARD_OPENCORES is not set
# CONFIG_KEYBOARD_STOWAWAY is not set
# CONFIG_KEYBOARD_SUNKBD is not set
# CONFIG_KEYBOARD_OMAP4 is not set
# CONFIG_KEYBOARD_XTKBD is not set
CONFIG_INPUT_MOUSE=y
CONFIG_MOUSE_PS2=y
CONFIG_MOUSE_PS2_ALPS=y
CONFIG_MOUSE_PS2_LOGIPS2PP=y
CONFIG_MOUSE_PS2_SYNAPTICS=y
CONFIG_MOUSE_PS2_LIFEBOOK=y
CONFIG_MOUSE_PS2_TRACKPOINT=y
# CONFIG_MOUSE_PS2_ELANTECH is not set
# CONFIG_MOUSE_PS2_SENTELIC is not set
# CONFIG_MOUSE_PS2_TOUCHKIT is not set
# CONFIG_MOUSE_SERIAL is not set
# CONFIG_MOUSE_APPLETOUCH is not set
# CONFIG_MOUSE_BCM5974 is not set
# CONFIG_MOUSE_VSXXXAA is not set
# CONFIG_MOUSE_SYNAPTICS_I2C is not set
# CONFIG_MOUSE_SYNAPTICS_USB is not set
# CONFIG_INPUT_JOYSTICK is not set
# CONFIG_INPUT_TABLET is not set
# CONFIG_INPUT_TOUCHSCREEN is not set
# CONFIG_INPUT_MISC is not set

#
# Hardware I/O ports
#
CONFIG_SERIO=y
CONFIG_SERIO_I8042=y
# CONFIG_SERIO_SERPORT is not set
# CONFIG_SERIO_CT82C710 is not set
# CONFIG_SERIO_PCIPS2 is not set
CONFIG_SERIO_LIBPS2=y
# CONFIG_SERIO_RAW is not set
# CONFIG_SERIO_ALTERA_PS2 is not set
# CONFIG_SERIO_PS2MULT is not set
# CONFIG_GAMEPORT is not set

#
# Character devices
#
CONFIG_VT=y
CONFIG_CONSOLE_TRANSLATIONS=y
CONFIG_VT_CONSOLE=y
CONFIG_VT_CONSOLE_SLEEP=y
CONFIG_HW_CONSOLE=y
# CONFIG_VT_HW_CONSOLE_BINDING is not set
CONFIG_UNIX98_PTYS=y
# CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set
CONFIG_LEGACY_PTYS=y
CONFIG_LEGACY_PTY_COUNT=256
# CONFIG_SERIAL_NONSTANDARD is not set
# CONFIG_NOZOMI is not set
# CONFIG_N_GSM is not set
# CONFIG_TRACE_SINK is not set
CONFIG_DEVKMEM=y

#
# Serial drivers
#
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_FIX_EARLYCON_MEM=y
CONFIG_SERIAL_8250_PCI=y
CONFIG_SERIAL_8250_PNP=y
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
# CONFIG_SERIAL_8250_EXTENDED is not set

#
# Non-8250 serial port support
#
# CONFIG_SERIAL_MFD_HSU is not set
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
# CONFIG_SERIAL_JSM is not set
# CONFIG_SERIAL_TIMBERDALE is not set
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
# CONFIG_SERIAL_PCH_UART is not set
# CONFIG_SERIAL_XILINX_PS_UART is not set
# CONFIG_TTY_PRINTK is not set
# CONFIG_IPMI_HANDLER is not set
CONFIG_HW_RANDOM=y
# CONFIG_HW_RANDOM_TIMERIOMEM is not set
CONFIG_HW_RANDOM_INTEL=y
# CONFIG_HW_RANDOM_AMD is not set
# CONFIG_HW_RANDOM_VIA is not set
# CONFIG_NVRAM is not set
CONFIG_RTC=y
# CONFIG_R3964 is not set
# CONFIG_APPLICOM is not set
# CONFIG_MWAVE is not set
# CONFIG_RAW_DRIVER is not set
CONFIG_HPET=y
CONFIG_HPET_MMAP=y
CONFIG_HANGCHECK_TIMER=y
# CONFIG_TCG_TPM is not set
# CONFIG_TELCLOCK is not set
CONFIG_DEVPORT=y
# CONFIG_RAMOOPS is not set
CONFIG_I2C=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_COMPAT=y
# CONFIG_I2C_CHARDEV is not set
# CONFIG_I2C_MUX is not set
CONFIG_I2C_HELPER_AUTO=y
CONFIG_I2C_ALGOBIT=y

#
# I2C Hardware Bus support
#

#
# PC SMBus host controller drivers
#
# CONFIG_I2C_ALI1535 is not set
# CONFIG_I2C_ALI1563 is not set
# CONFIG_I2C_ALI15X3 is not set
# CONFIG_I2C_AMD756 is not set
# CONFIG_I2C_AMD8111 is not set
# CONFIG_I2C_I801 is not set
# CONFIG_I2C_ISCH is not set
# CONFIG_I2C_PIIX4 is not set
# CONFIG_I2C_NFORCE2 is not set
# CONFIG_I2C_SIS5595 is not set
# CONFIG_I2C_SIS630 is not set
# CONFIG_I2C_SIS96X is not set
# CONFIG_I2C_VIA is not set
# CONFIG_I2C_VIAPRO is not set

#
# ACPI drivers
#
# CONFIG_I2C_SCMI is not set

#
# I2C system bus drivers (mostly embedded / system-on-chip)
#
# CONFIG_I2C_DESIGNWARE_PCI is not set
# CONFIG_I2C_EG20T is not set
# CONFIG_I2C_INTEL_MID is not set
# CONFIG_I2C_OCORES is not set
# CONFIG_I2C_PCA_PLATFORM is not set
# CONFIG_I2C_PXA_PCI is not set
# CONFIG_I2C_SIMTEC is not set
# CONFIG_I2C_XILINX is not set

#
# External I2C/SMBus adapter drivers
#
# CONFIG_I2C_DIOLAN_U2C is not set
# CONFIG_I2C_PARPORT_LIGHT is not set
# CONFIG_I2C_TAOS_EVM is not set
# CONFIG_I2C_TINY_USB is not set

#
# Other I2C/SMBus bus drivers
#
# CONFIG_I2C_STUB is not set
# CONFIG_I2C_DEBUG_CORE is not set
# CONFIG_I2C_DEBUG_ALGO is not set
# CONFIG_I2C_DEBUG_BUS is not set
# CONFIG_SPI is not set
# CONFIG_HSI is not set

#
# PPS support
#
# CONFIG_PPS is not set

#
# PPS generators support
#

#
# PTP clock support
#

#
# Enable Device Drivers -> PPS to see the PTP clock options.
#
CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y
# CONFIG_GPIOLIB is not set
# CONFIG_W1 is not set
CONFIG_POWER_SUPPLY=y
# CONFIG_POWER_SUPPLY_DEBUG is not set
# CONFIG_PDA_POWER is not set
# CONFIG_TEST_POWER is not set
# CONFIG_BATTERY_DS2780 is not set
# CONFIG_BATTERY_DS2781 is not set
# CONFIG_BATTERY_DS2782 is not set
# CONFIG_BATTERY_SBS is not set
# CONFIG_BATTERY_BQ27x00 is not set
# CONFIG_BATTERY_MAX17040 is not set
# CONFIG_BATTERY_MAX17042 is not set
# CONFIG_CHARGER_MAX8903 is not set
# CONFIG_CHARGER_LP8727 is not set
# CONFIG_CHARGER_SMB347 is not set
CONFIG_HWMON=m
# CONFIG_HWMON_VID is not set
# CONFIG_HWMON_DEBUG_CHIP is not set

#
# Native drivers
#
# CONFIG_SENSORS_ABITUGURU is not set
# CONFIG_SENSORS_ABITUGURU3 is not set
# CONFIG_SENSORS_AD7414 is not set
# CONFIG_SENSORS_AD7418 is not set
# CONFIG_SENSORS_ADM1021 is not set
# CONFIG_SENSORS_ADM1025 is not set
# CONFIG_SENSORS_ADM1026 is not set
# CONFIG_SENSORS_ADM1029 is not set
# CONFIG_SENSORS_ADM1031 is not set
# CONFIG_SENSORS_ADM9240 is not set
# CONFIG_SENSORS_ADT7411 is not set
# CONFIG_SENSORS_ADT7462 is not set
# CONFIG_SENSORS_ADT7470 is not set
# CONFIG_SENSORS_ADT7475 is not set
# CONFIG_SENSORS_ASC7621 is not set
# CONFIG_SENSORS_K8TEMP is not set
# CONFIG_SENSORS_K10TEMP is not set
# CONFIG_SENSORS_FAM15H_POWER is not set
# CONFIG_SENSORS_ASB100 is not set
# CONFIG_SENSORS_ATXP1 is not set
# CONFIG_SENSORS_DS620 is not set
# CONFIG_SENSORS_DS1621 is not set
# CONFIG_SENSORS_I5K_AMB is not set
# CONFIG_SENSORS_F71805F is not set
# CONFIG_SENSORS_F71882FG is not set
# CONFIG_SENSORS_F75375S is not set
# CONFIG_SENSORS_FSCHMD is not set
# CONFIG_SENSORS_G760A is not set
# CONFIG_SENSORS_GL518SM is not set
# CONFIG_SENSORS_GL520SM is not set
# CONFIG_SENSORS_CORETEMP is not set
# CONFIG_SENSORS_IT87 is not set
# CONFIG_SENSORS_JC42 is not set
# CONFIG_SENSORS_LINEAGE is not set
# CONFIG_SENSORS_LM63 is not set
# CONFIG_SENSORS_LM73 is not set
# CONFIG_SENSORS_LM75 is not set
# CONFIG_SENSORS_LM77 is not set
# CONFIG_SENSORS_LM78 is not set
# CONFIG_SENSORS_LM80 is not set
# CONFIG_SENSORS_LM83 is not set
# CONFIG_SENSORS_LM85 is not set
# CONFIG_SENSORS_LM87 is not set
# CONFIG_SENSORS_LM90 is not set
# CONFIG_SENSORS_LM92 is not set
# CONFIG_SENSORS_LM93 is not set
# CONFIG_SENSORS_LTC4151 is not set
# CONFIG_SENSORS_LTC4215 is not set
# CONFIG_SENSORS_LTC4245 is not set
# CONFIG_SENSORS_LTC4261 is not set
# CONFIG_SENSORS_LM95241 is not set
# CONFIG_SENSORS_LM95245 is not set
# CONFIG_SENSORS_MAX16065 is not set
# CONFIG_SENSORS_MAX1619 is not set
# CONFIG_SENSORS_MAX1668 is not set
# CONFIG_SENSORS_MAX6639 is not set
# CONFIG_SENSORS_MAX6642 is not set
# CONFIG_SENSORS_MAX6650 is not set
# CONFIG_SENSORS_MCP3021 is not set
# CONFIG_SENSORS_NTC_THERMISTOR is not set
# CONFIG_SENSORS_PC87360 is not set
# CONFIG_SENSORS_PC87427 is not set
# CONFIG_SENSORS_PCF8591 is not set
# CONFIG_PMBUS is not set
# CONFIG_SENSORS_SHT21 is not set
# CONFIG_SENSORS_SIS5595 is not set
# CONFIG_SENSORS_SMM665 is not set
# CONFIG_SENSORS_DME1737 is not set
# CONFIG_SENSORS_EMC1403 is not set
# CONFIG_SENSORS_EMC2103 is not set
# CONFIG_SENSORS_EMC6W201 is not set
# CONFIG_SENSORS_SMSC47M1 is not set
# CONFIG_SENSORS_SMSC47M192 is not set
# CONFIG_SENSORS_SMSC47B397 is not set
# CONFIG_SENSORS_SCH56XX_COMMON is not set
# CONFIG_SENSORS_SCH5627 is not set
# CONFIG_SENSORS_SCH5636 is not set
# CONFIG_SENSORS_ADS1015 is not set
# CONFIG_SENSORS_ADS7828 is not set
# CONFIG_SENSORS_AMC6821 is not set
# CONFIG_SENSORS_THMC50 is not set
# CONFIG_SENSORS_TMP102 is not set
# CONFIG_SENSORS_TMP401 is not set
# CONFIG_SENSORS_TMP421 is not set
# CONFIG_SENSORS_VIA_CPUTEMP is not set
# CONFIG_SENSORS_VIA686A is not set
# CONFIG_SENSORS_VT1211 is not set
# CONFIG_SENSORS_VT8231 is not set
# CONFIG_SENSORS_W83781D is not set
# CONFIG_SENSORS_W83791D is not set
# CONFIG_SENSORS_W83792D is not set
# CONFIG_SENSORS_W83793 is not set
# CONFIG_SENSORS_W83795 is not set
# CONFIG_SENSORS_W83L785TS is not set
# CONFIG_SENSORS_W83L786NG is not set
# CONFIG_SENSORS_W83627HF is not set
# CONFIG_SENSORS_W83627EHF is not set
# CONFIG_SENSORS_APPLESMC is not set

#
# ACPI drivers
#
# CONFIG_SENSORS_ACPI_POWER is not set
# CONFIG_SENSORS_ATK0110 is not set
CONFIG_THERMAL=y
# CONFIG_WATCHDOG is not set
CONFIG_SSB_POSSIBLE=y

#
# Sonics Silicon Backplane
#
# CONFIG_SSB is not set
CONFIG_BCMA_POSSIBLE=y

#
# Broadcom specific AMBA
#
# CONFIG_BCMA is not set

#
# Multifunction device drivers
#
# CONFIG_MFD_CORE is not set
# CONFIG_MFD_88PM860X is not set
# CONFIG_MFD_SM501 is not set
# CONFIG_HTC_PASIC3 is not set
# CONFIG_TPS6105X is not set
# CONFIG_TPS6507X is not set
# CONFIG_MFD_TPS65217 is not set
# CONFIG_TWL4030_CORE is not set
# CONFIG_MFD_STMPE is not set
# CONFIG_MFD_TC3589X is not set
# CONFIG_MFD_TMIO is not set
# CONFIG_PMIC_DA903X is not set
# CONFIG_MFD_DA9052_I2C is not set
# CONFIG_PMIC_ADP5520 is not set
# CONFIG_MFD_MAX8925 is not set
# CONFIG_MFD_MAX8997 is not set
# CONFIG_MFD_MAX8998 is not set
# CONFIG_MFD_S5M_CORE is not set
# CONFIG_MFD_WM8400 is not set
# CONFIG_MFD_WM831X_I2C is not set
# CONFIG_MFD_WM8350_I2C is not set
# CONFIG_MFD_WM8994 is not set
# CONFIG_MFD_PCF50633 is not set
# CONFIG_ABX500_CORE is not set
# CONFIG_MFD_CS5535 is not set
# CONFIG_LPC_SCH is not set
# CONFIG_MFD_RDC321X is not set
# CONFIG_MFD_JANZ_CMODIO is not set
# CONFIG_MFD_VX855 is not set
# CONFIG_MFD_WL1273_CORE is not set
# CONFIG_MFD_TPS65090 is not set
# CONFIG_MFD_RC5T583 is not set
# CONFIG_REGULATOR is not set
CONFIG_MEDIA_SUPPORT=m

#
# Multimedia core support
#
# CONFIG_MEDIA_CONTROLLER is not set
CONFIG_VIDEO_DEV=m
CONFIG_VIDEO_V4L2_COMMON=m
# CONFIG_DVB_CORE is not set
CONFIG_VIDEO_MEDIA=m

#
# Multimedia drivers
#
# CONFIG_RC_CORE is not set
# CONFIG_MEDIA_ATTACH is not set
CONFIG_MEDIA_TUNER=m
CONFIG_MEDIA_TUNER_CUSTOMISE=y

#
# Customize TV tuners
#
CONFIG_MEDIA_TUNER_SIMPLE=m
CONFIG_MEDIA_TUNER_TDA8290=m
CONFIG_MEDIA_TUNER_TDA827X=m
CONFIG_MEDIA_TUNER_TDA18271=m
CONFIG_MEDIA_TUNER_TDA9887=m
CONFIG_MEDIA_TUNER_TEA5761=m
CONFIG_MEDIA_TUNER_TEA5767=m
CONFIG_MEDIA_TUNER_MT20XX=m
CONFIG_MEDIA_TUNER_MT2060=m
CONFIG_MEDIA_TUNER_MT2063=m
CONFIG_MEDIA_TUNER_MT2266=m
CONFIG_MEDIA_TUNER_MT2131=m
CONFIG_MEDIA_TUNER_QT1010=m
CONFIG_MEDIA_TUNER_XC2028=m
CONFIG_MEDIA_TUNER_XC5000=m
CONFIG_MEDIA_TUNER_XC4000=m
CONFIG_MEDIA_TUNER_MXL5005S=m
CONFIG_MEDIA_TUNER_MXL5007T=m
CONFIG_MEDIA_TUNER_MC44S803=m
CONFIG_MEDIA_TUNER_MAX2165=m
CONFIG_MEDIA_TUNER_TDA18218=m
CONFIG_MEDIA_TUNER_TDA18212=m
CONFIG_VIDEO_V4L2=m
CONFIG_VIDEOBUF2_CORE=m
CONFIG_VIDEOBUF2_MEMOPS=m
CONFIG_VIDEOBUF2_VMALLOC=m
CONFIG_VIDEO_CAPTURE_DRIVERS=y
# CONFIG_VIDEO_ADV_DEBUG is not set
# CONFIG_VIDEO_FIXED_MINOR_RANGES is not set
# CONFIG_VIDEO_HELPER_CHIPS_AUTO is not set

#
# Encoders, decoders, sensors and other helper chips
#

#
# Audio decoders, processors and mixers
#
# CONFIG_VIDEO_TVAUDIO is not set
# CONFIG_VIDEO_TDA7432 is not set
# CONFIG_VIDEO_TDA9840 is not set
# CONFIG_VIDEO_TEA6415C is not set
# CONFIG_VIDEO_TEA6420 is not set
# CONFIG_VIDEO_MSP3400 is not set
# CONFIG_VIDEO_CS5345 is not set
# CONFIG_VIDEO_CS53L32A is not set
# CONFIG_VIDEO_TLV320AIC23B is not set
# CONFIG_VIDEO_WM8775 is not set
# CONFIG_VIDEO_WM8739 is not set
# CONFIG_VIDEO_VP27SMPX is not set

#
# RDS decoders
#
# CONFIG_VIDEO_SAA6588 is not set

#
# Video decoders
#
# CONFIG_VIDEO_ADV7180 is not set
# CONFIG_VIDEO_ADV7183 is not set
# CONFIG_VIDEO_BT819 is not set
# CONFIG_VIDEO_BT856 is not set
# CONFIG_VIDEO_BT866 is not set
# CONFIG_VIDEO_KS0127 is not set
# CONFIG_VIDEO_SAA7110 is not set
# CONFIG_VIDEO_SAA711X is not set
# CONFIG_VIDEO_SAA7191 is not set
# CONFIG_VIDEO_TVP514X is not set
# CONFIG_VIDEO_TVP5150 is not set
# CONFIG_VIDEO_TVP7002 is not set
# CONFIG_VIDEO_VPX3220 is not set

#
# Video and audio decoders
#
# CONFIG_VIDEO_SAA717X is not set
# CONFIG_VIDEO_CX25840 is not set

#
# MPEG video encoders
#
# CONFIG_VIDEO_CX2341X is not set

#
# Video encoders
#
# CONFIG_VIDEO_SAA7127 is not set
# CONFIG_VIDEO_SAA7185 is not set
# CONFIG_VIDEO_ADV7170 is not set
# CONFIG_VIDEO_ADV7175 is not set
# CONFIG_VIDEO_ADV7343 is not set
# CONFIG_VIDEO_AK881X is not set

#
# Camera sensor devices
#
# CONFIG_VIDEO_OV7670 is not set
# CONFIG_VIDEO_VS6624 is not set
# CONFIG_VIDEO_MT9M032 is not set
# CONFIG_VIDEO_MT9V011 is not set
# CONFIG_VIDEO_TCM825X is not set
# CONFIG_VIDEO_SR030PC30 is not set

#
# Flash devices
#

#
# Video improvement chips
#
# CONFIG_VIDEO_UPD64031A is not set
# CONFIG_VIDEO_UPD64083 is not set

#
# Miscelaneous helper chips
#
# CONFIG_VIDEO_THS7303 is not set
# CONFIG_VIDEO_M52790 is not set
# CONFIG_VIDEO_VIVI is not set
CONFIG_V4L_USB_DRIVERS=y
CONFIG_USB_VIDEO_CLASS=m
CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y
# CONFIG_USB_GSPCA is not set
# CONFIG_VIDEO_PVRUSB2 is not set
# CONFIG_VIDEO_HDPVR is not set
# CONFIG_VIDEO_EM28XX is not set
# CONFIG_VIDEO_USBVISION is not set
# CONFIG_USB_ET61X251 is not set
# CONFIG_USB_SN9C102 is not set
# CONFIG_USB_PWC is not set
# CONFIG_VIDEO_CPIA2 is not set
# CONFIG_USB_ZR364XX is not set
# CONFIG_USB_STKWEBCAM is not set
# CONFIG_USB_S2255 is not set
CONFIG_V4L_PCI_DRIVERS=y
# CONFIG_VIDEO_HEXIUM_GEMINI is not set
# CONFIG_VIDEO_HEXIUM_ORION is not set
# CONFIG_VIDEO_MXB is not set
# CONFIG_VIDEO_SAA7134 is not set
# CONFIG_VIDEO_ZORAN is not set
# CONFIG_V4L_PLATFORM_DRIVERS is not set
# CONFIG_V4L_MEM2MEM_DRIVERS is not set
# CONFIG_RADIO_ADAPTERS is not set

#
# Graphics support
#
CONFIG_AGP=y
CONFIG_AGP_AMD64=y
CONFIG_AGP_INTEL=y
# CONFIG_AGP_SIS is not set
# CONFIG_AGP_VIA is not set
CONFIG_VGA_ARB=y
CONFIG_VGA_ARB_MAX_GPUS=16
# CONFIG_VGA_SWITCHEROO is not set
CONFIG_DRM=m
CONFIG_DRM_KMS_HELPER=m
# CONFIG_DRM_LOAD_EDID_FIRMWARE is not set
CONFIG_DRM_TTM=m
# CONFIG_DRM_TDFX is not set
# CONFIG_DRM_R128 is not set
CONFIG_DRM_RADEON=m
CONFIG_DRM_RADEON_KMS=y
# CONFIG_DRM_NOUVEAU is not set

#
# I2C encoder or helper chips
#
# CONFIG_DRM_I2C_CH7006 is not set
# CONFIG_DRM_I2C_SIL164 is not set
# CONFIG_DRM_I915 is not set
# CONFIG_DRM_MGA is not set
# CONFIG_DRM_SIS is not set
# CONFIG_DRM_VIA is not set
# CONFIG_DRM_SAVAGE is not set
# CONFIG_DRM_VMWGFX is not set
# CONFIG_DRM_GMA500 is not set
# CONFIG_DRM_UDL is not set
# CONFIG_STUB_POULSBO is not set
# CONFIG_VGASTATE is not set
# CONFIG_VIDEO_OUTPUT_CONTROL is not set
CONFIG_FB=y
CONFIG_FIRMWARE_EDID=y
CONFIG_FB_DDC=y
CONFIG_FB_BOOT_VESA_SUPPORT=y
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_IMAGEBLIT=y
# CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set
# CONFIG_FB_SYS_FILLRECT is not set
# CONFIG_FB_SYS_COPYAREA is not set
# CONFIG_FB_SYS_IMAGEBLIT is not set
# CONFIG_FB_FOREIGN_ENDIAN is not set
# CONFIG_FB_SYS_FOPS is not set
# CONFIG_FB_WMT_GE_ROPS is not set
# CONFIG_FB_SVGALIB is not set
# CONFIG_FB_MACMODES is not set
CONFIG_FB_BACKLIGHT=y
CONFIG_FB_MODE_HELPERS=y
CONFIG_FB_TILEBLITTING=y

#
# Frame buffer hardware drivers
#
# CONFIG_FB_CIRRUS is not set
# CONFIG_FB_PM2 is not set
# CONFIG_FB_CYBER2000 is not set
# CONFIG_FB_ARC is not set
# CONFIG_FB_ASILIANT is not set
# CONFIG_FB_IMSTT is not set
# CONFIG_FB_VGA16 is not set
CONFIG_FB_VESA=y
# CONFIG_FB_N411 is not set
# CONFIG_FB_HGA is not set
# CONFIG_FB_S1D13XXX is not set
# CONFIG_FB_NVIDIA is not set
# CONFIG_FB_RIVA is not set
# CONFIG_FB_I740 is not set
# CONFIG_FB_LE80578 is not set
# CONFIG_FB_INTEL is not set
# CONFIG_FB_MATROX is not set
CONFIG_FB_RADEON=y
CONFIG_FB_RADEON_I2C=y
CONFIG_FB_RADEON_BACKLIGHT=y
# CONFIG_FB_RADEON_DEBUG is not set
# CONFIG_FB_ATY128 is not set
# CONFIG_FB_ATY is not set
# CONFIG_FB_S3 is not set
# CONFIG_FB_SAVAGE is not set
# CONFIG_FB_SIS is not set
# CONFIG_FB_VIA is not set
# CONFIG_FB_NEOMAGIC is not set
# CONFIG_FB_KYRO is not set
# CONFIG_FB_3DFX is not set
# CONFIG_FB_VOODOO1 is not set
# CONFIG_FB_VT8623 is not set
# CONFIG_FB_TRIDENT is not set
# CONFIG_FB_ARK is not set
# CONFIG_FB_PM3 is not set
# CONFIG_FB_CARMINE is not set
# CONFIG_FB_GEODE is not set
# CONFIG_FB_SMSCUFX is not set
# CONFIG_FB_UDL is not set
# CONFIG_FB_VIRTUAL is not set
# CONFIG_FB_METRONOME is not set
# CONFIG_FB_MB862XX is not set
# CONFIG_FB_BROADSHEET is not set
# CONFIG_EXYNOS_VIDEO is not set
CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_LCD_CLASS_DEVICE=y
# CONFIG_LCD_PLATFORM is not set
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_GENERIC=y
# CONFIG_BACKLIGHT_PROGEAR is not set
# CONFIG_BACKLIGHT_APPLE is not set
# CONFIG_BACKLIGHT_SAHARA is not set
# CONFIG_BACKLIGHT_ADP8860 is not set
# CONFIG_BACKLIGHT_ADP8870 is not set
# CONFIG_BACKLIGHT_LP855X is not set

#
# Console display driver support
#
CONFIG_VGA_CONSOLE=y
# CONFIG_VGACON_SOFT_SCROLLBACK is not set
CONFIG_DUMMY_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
# CONFIG_FONTS is not set
CONFIG_FONT_8x8=y
CONFIG_FONT_8x16=y
# CONFIG_LOGO is not set
CONFIG_SOUND=y
CONFIG_SOUND_OSS_CORE=y
CONFIG_SOUND_OSS_CORE_PRECLAIM=y
CONFIG_SND=y
CONFIG_SND_TIMER=y
CONFIG_SND_PCM=y
CONFIG_SND_HWDEP=m
CONFIG_SND_RAWMIDI=m
# CONFIG_SND_SEQUENCER is not set
CONFIG_SND_OSSEMUL=y
CONFIG_SND_MIXER_OSS=y
CONFIG_SND_PCM_OSS=y
CONFIG_SND_PCM_OSS_PLUGINS=y
# CONFIG_SND_HRTIMER is not set
# CONFIG_SND_RTCTIMER is not set
CONFIG_SND_DYNAMIC_MINORS=y
CONFIG_SND_SUPPORT_OLD_API=y
CONFIG_SND_VERBOSE_PROCFS=y
# CONFIG_SND_VERBOSE_PRINTK is not set
# CONFIG_SND_DEBUG is not set
CONFIG_SND_DMA_SGBUF=y
# CONFIG_SND_RAWMIDI_SEQ is not set
# CONFIG_SND_OPL3_LIB_SEQ is not set
# CONFIG_SND_OPL4_LIB_SEQ is not set
# CONFIG_SND_SBAWE_SEQ is not set
# CONFIG_SND_EMU10K1_SEQ is not set
CONFIG_SND_DRIVERS=y
# CONFIG_SND_PCSP is not set
# CONFIG_SND_DUMMY is not set
# CONFIG_SND_ALOOP is not set
# CONFIG_SND_MTPAV is not set
# CONFIG_SND_SERIAL_U16550 is not set
# CONFIG_SND_MPU401 is not set
CONFIG_SND_PCI=y
# CONFIG_SND_AD1889 is not set
# CONFIG_SND_ALS300 is not set
# CONFIG_SND_ALS4000 is not set
# CONFIG_SND_ALI5451 is not set
# CONFIG_SND_ASIHPI is not set
# CONFIG_SND_ATIIXP is not set
# CONFIG_SND_ATIIXP_MODEM is not set
# CONFIG_SND_AU8810 is not set
# CONFIG_SND_AU8820 is not set
# CONFIG_SND_AU8830 is not set
# CONFIG_SND_AW2 is not set
# CONFIG_SND_AZT3328 is not set
# CONFIG_SND_BT87X is not set
# CONFIG_SND_CA0106 is not set
# CONFIG_SND_CMIPCI is not set
# CONFIG_SND_OXYGEN is not set
# CONFIG_SND_CS4281 is not set
# CONFIG_SND_CS46XX is not set
# CONFIG_SND_CS5530 is not set
# CONFIG_SND_CS5535AUDIO is not set
# CONFIG_SND_CTXFI is not set
# CONFIG_SND_DARLA20 is not set
# CONFIG_SND_GINA20 is not set
# CONFIG_SND_LAYLA20 is not set
# CONFIG_SND_DARLA24 is not set
# CONFIG_SND_GINA24 is not set
# CONFIG_SND_LAYLA24 is not set
# CONFIG_SND_MONA is not set
# CONFIG_SND_MIA is not set
# CONFIG_SND_ECHO3G is not set
# CONFIG_SND_INDIGO is not set
# CONFIG_SND_INDIGOIO is not set
# CONFIG_SND_INDIGODJ is not set
# CONFIG_SND_INDIGOIOX is not set
# CONFIG_SND_INDIGODJX is not set
# CONFIG_SND_EMU10K1 is not set
# CONFIG_SND_EMU10K1X is not set
# CONFIG_SND_ENS1370 is not set
# CONFIG_SND_ENS1371 is not set
# CONFIG_SND_ES1938 is not set
# CONFIG_SND_ES1968 is not set
# CONFIG_SND_FM801 is not set
# CONFIG_SND_HDA_INTEL is not set
# CONFIG_SND_HDSP is not set
# CONFIG_SND_HDSPM is not set
# CONFIG_SND_ICE1712 is not set
# CONFIG_SND_ICE1724 is not set
# CONFIG_SND_INTEL8X0 is not set
# CONFIG_SND_INTEL8X0M is not set
# CONFIG_SND_KORG1212 is not set
# CONFIG_SND_LOLA is not set
# CONFIG_SND_LX6464ES is not set
# CONFIG_SND_MAESTRO3 is not set
# CONFIG_SND_MIXART is not set
# CONFIG_SND_NM256 is not set
# CONFIG_SND_PCXHR is not set
# CONFIG_SND_RIPTIDE is not set
# CONFIG_SND_RME32 is not set
# CONFIG_SND_RME96 is not set
# CONFIG_SND_RME9652 is not set
# CONFIG_SND_SONICVIBES is not set
# CONFIG_SND_TRIDENT is not set
# CONFIG_SND_VIA82XX is not set
# CONFIG_SND_VIA82XX_MODEM is not set
# CONFIG_SND_VIRTUOSO is not set
# CONFIG_SND_VX222 is not set
# CONFIG_SND_YMFPCI is not set
CONFIG_SND_USB=y
CONFIG_SND_USB_AUDIO=m
# CONFIG_SND_USB_UA101 is not set
# CONFIG_SND_USB_USX2Y is not set
# CONFIG_SND_USB_CAIAQ is not set
# CONFIG_SND_USB_US122L is not set
# CONFIG_SND_USB_6FIRE is not set
# CONFIG_SND_FIREWIRE is not set
# CONFIG_SND_SOC is not set
# CONFIG_SOUND_PRIME is not set
CONFIG_HID_SUPPORT=y
CONFIG_HID=y
CONFIG_HID_BATTERY_STRENGTH=y
# CONFIG_HIDRAW is not set

#
# USB Input Devices
#
CONFIG_USB_HID=m
# CONFIG_HID_PID is not set
# CONFIG_USB_HIDDEV is not set

#
# USB HID Boot Protocol drivers
#
CONFIG_USB_KBD=m
CONFIG_USB_MOUSE=m

#
# Special HID drivers
#
# CONFIG_HID_A4TECH is not set
# CONFIG_HID_ACRUX is not set
CONFIG_HID_APPLE=m
# CONFIG_HID_BELKIN is not set
# CONFIG_HID_CHERRY is not set
# CONFIG_HID_CHICONY is not set
# CONFIG_HID_PRODIKEYS is not set
# CONFIG_HID_CYPRESS is not set
# CONFIG_HID_DRAGONRISE is not set
# CONFIG_HID_EMS_FF is not set
# CONFIG_HID_EZKEY is not set
# CONFIG_HID_HOLTEK is not set
# CONFIG_HID_KEYTOUCH is not set
# CONFIG_HID_KYE is not set
# CONFIG_HID_UCLOGIC is not set
# CONFIG_HID_WALTOP is not set
# CONFIG_HID_GYRATION is not set
# CONFIG_HID_TWINHAN is not set
# CONFIG_HID_KENSINGTON is not set
# CONFIG_HID_LCPOWER is not set
# CONFIG_HID_LOGITECH is not set
# CONFIG_HID_MICROSOFT is not set
# CONFIG_HID_MONTEREY is not set
# CONFIG_HID_MULTITOUCH is not set
# CONFIG_HID_NTRIG is not set
# CONFIG_HID_ORTEK is not set
# CONFIG_HID_PANTHERLORD is not set
# CONFIG_HID_PETALYNX is not set
# CONFIG_HID_PICOLCD is not set
# CONFIG_HID_PRIMAX is not set
# CONFIG_HID_ROCCAT is not set
# CONFIG_HID_SAITEK is not set
# CONFIG_HID_SAMSUNG is not set
# CONFIG_HID_SONY is not set
# CONFIG_HID_SPEEDLINK is not set
# CONFIG_HID_SUNPLUS is not set
# CONFIG_HID_GREENASIA is not set
# CONFIG_HID_SMARTJOYPLUS is not set
# CONFIG_HID_TIVO is not set
# CONFIG_HID_TOPSEED is not set
# CONFIG_HID_THRUSTMASTER is not set
# CONFIG_HID_ZEROPLUS is not set
# CONFIG_HID_ZYDACRON is not set
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB_ARCH_HAS_EHCI=y
CONFIG_USB_ARCH_HAS_XHCI=y
CONFIG_USB_SUPPORT=y
CONFIG_USB_COMMON=m
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB=m
# CONFIG_USB_DEBUG is not set
# CONFIG_USB_ANNOUNCE_NEW_DEVICES is not set

#
# Miscellaneous USB options
#
CONFIG_USB_DEVICEFS=y
# CONFIG_USB_DEVICE_CLASS is not set
# CONFIG_USB_DYNAMIC_MINORS is not set
# CONFIG_USB_SUSPEND is not set
# CONFIG_USB_OTG_WHITELIST is not set
# CONFIG_USB_OTG_BLACKLIST_HUB is not set
# CONFIG_USB_MON is not set
# CONFIG_USB_WUSB_CBAF is not set

#
# USB Host Controller Drivers
#
# CONFIG_USB_C67X00_HCD is not set
CONFIG_USB_XHCI_HCD=m
# CONFIG_USB_XHCI_HCD_DEBUGGING is not set
CONFIG_USB_EHCI_HCD=m
# CONFIG_USB_EHCI_ROOT_HUB_TT is not set
# CONFIG_USB_EHCI_TT_NEWSCHED is not set
# CONFIG_USB_OXU210HP_HCD is not set
# CONFIG_USB_ISP116X_HCD is not set
# CONFIG_USB_ISP1760_HCD is not set
# CONFIG_USB_ISP1362_HCD is not set
# CONFIG_USB_OHCI_HCD is not set
# CONFIG_USB_EHCI_HCD_PLATFORM is not set
CONFIG_USB_UHCI_HCD=m
# CONFIG_USB_SL811_HCD is not set
# CONFIG_USB_R8A66597_HCD is not set

#
# USB Device Class drivers
#
# CONFIG_USB_ACM is not set
# CONFIG_USB_PRINTER is not set
# CONFIG_USB_WDM is not set
# CONFIG_USB_TMC is not set

#
# NOTE: USB_STORAGE depends on SCSI but BLK_DEV_SD may
#

#
# also be needed; see USB_STORAGE Help for more info
#
CONFIG_USB_STORAGE=m
# CONFIG_USB_STORAGE_DEBUG is not set
# CONFIG_USB_STORAGE_REALTEK is not set
# CONFIG_USB_STORAGE_DATAFAB is not set
# CONFIG_USB_STORAGE_FREECOM is not set
# CONFIG_USB_STORAGE_ISD200 is not set
# CONFIG_USB_STORAGE_USBAT is not set
# CONFIG_USB_STORAGE_SDDR09 is not set
# CONFIG_USB_STORAGE_SDDR55 is not set
# CONFIG_USB_STORAGE_JUMPSHOT is not set
# CONFIG_USB_STORAGE_ALAUDA is not set
# CONFIG_USB_STORAGE_ONETOUCH is not set
# CONFIG_USB_STORAGE_KARMA is not set
# CONFIG_USB_STORAGE_CYPRESS_ATACB is not set
# CONFIG_USB_STORAGE_ENE_UB6250 is not set
# CONFIG_USB_UAS is not set
# CONFIG_USB_LIBUSUAL is not set

#
# USB Imaging devices
#
# CONFIG_USB_MDC800 is not set
# CONFIG_USB_MICROTEK is not set

#
# USB port drivers
#
CONFIG_USB_SERIAL=m
# CONFIG_USB_EZUSB is not set
CONFIG_USB_SERIAL_GENERIC=y
# CONFIG_USB_SERIAL_AIRCABLE is not set
# CONFIG_USB_SERIAL_ARK3116 is not set
# CONFIG_USB_SERIAL_BELKIN is not set
# CONFIG_USB_SERIAL_CH341 is not set
# CONFIG_USB_SERIAL_WHITEHEAT is not set
# CONFIG_USB_SERIAL_DIGI_ACCELEPORT is not set
CONFIG_USB_SERIAL_CP210X=m
# CONFIG_USB_SERIAL_CYPRESS_M8 is not set
# CONFIG_USB_SERIAL_EMPEG is not set
# CONFIG_USB_SERIAL_FTDI_SIO is not set
# CONFIG_USB_SERIAL_FUNSOFT is not set
# CONFIG_USB_SERIAL_VISOR is not set
# CONFIG_USB_SERIAL_IPAQ is not set
# CONFIG_USB_SERIAL_IR is not set
# CONFIG_USB_SERIAL_EDGEPORT is not set
# CONFIG_USB_SERIAL_EDGEPORT_TI is not set
# CONFIG_USB_SERIAL_F81232 is not set
# CONFIG_USB_SERIAL_GARMIN is not set
# CONFIG_USB_SERIAL_IPW is not set
# CONFIG_USB_SERIAL_IUU is not set
# CONFIG_USB_SERIAL_KEYSPAN_PDA is not set
# CONFIG_USB_SERIAL_KEYSPAN is not set
# CONFIG_USB_SERIAL_KLSI is not set
# CONFIG_USB_SERIAL_KOBIL_SCT is not set
# CONFIG_USB_SERIAL_MCT_U232 is not set
# CONFIG_USB_SERIAL_METRO is not set
# CONFIG_USB_SERIAL_MOS7720 is not set
# CONFIG_USB_SERIAL_MOS7840 is not set
# CONFIG_USB_SERIAL_MOTOROLA is not set
# CONFIG_USB_SERIAL_NAVMAN is not set
# CONFIG_USB_SERIAL_PL2303 is not set
# CONFIG_USB_SERIAL_OTI6858 is not set
# CONFIG_USB_SERIAL_QCAUX is not set
# CONFIG_USB_SERIAL_QUALCOMM is not set
# CONFIG_USB_SERIAL_SPCP8X5 is not set
# CONFIG_USB_SERIAL_HP4X is not set
# CONFIG_USB_SERIAL_SAFE is not set
# CONFIG_USB_SERIAL_SIEMENS_MPI is not set
# CONFIG_USB_SERIAL_SIERRAWIRELESS is not set
# CONFIG_USB_SERIAL_SYMBOL is not set
# CONFIG_USB_SERIAL_TI is not set
# CONFIG_USB_SERIAL_CYBERJACK is not set
# CONFIG_USB_SERIAL_XIRCOM is not set
# CONFIG_USB_SERIAL_OPTION is not set
# CONFIG_USB_SERIAL_OMNINET is not set
# CONFIG_USB_SERIAL_OPTICON is not set
# CONFIG_USB_SERIAL_VIVOPAY_SERIAL is not set
# CONFIG_USB_SERIAL_ZIO is not set
# CONFIG_USB_SERIAL_SSU100 is not set
# CONFIG_USB_SERIAL_DEBUG is not set

#
# USB Miscellaneous drivers
#
# CONFIG_USB_EMI62 is not set
# CONFIG_USB_EMI26 is not set
# CONFIG_USB_ADUTUX is not set
# CONFIG_USB_SEVSEG is not set
# CONFIG_USB_RIO500 is not set
# CONFIG_USB_LEGOTOWER is not set
# CONFIG_USB_LCD is not set
# CONFIG_USB_LED is not set
# CONFIG_USB_CYPRESS_CY7C63 is not set
# CONFIG_USB_CYTHERM is not set
# CONFIG_USB_IDMOUSE is not set
# CONFIG_USB_FTDI_ELAN is not set
CONFIG_USB_APPLEDISPLAY=m
# CONFIG_USB_SISUSBVGA is not set
# CONFIG_USB_LD is not set
# CONFIG_USB_TRANCEVIBRATOR is not set
# CONFIG_USB_IOWARRIOR is not set
# CONFIG_USB_TEST is not set
# CONFIG_USB_ISIGHTFW is not set
# CONFIG_USB_YUREX is not set
# CONFIG_USB_GADGET is not set

#
# OTG and related infrastructure
#
# CONFIG_NOP_USB_XCEIV is not set
# CONFIG_UWB is not set
# CONFIG_MMC is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_ACCESSIBILITY is not set
# CONFIG_INFINIBAND is not set
# CONFIG_EDAC is not set
# CONFIG_RTC_CLASS is not set
# CONFIG_DMADEVICES is not set
# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set

#
# Virtio drivers
#
# CONFIG_VIRTIO_PCI is not set
# CONFIG_VIRTIO_BALLOON is not set
# CONFIG_VIRTIO_MMIO is not set

#
# Microsoft Hyper-V guest support
#
# CONFIG_HYPERV is not set
# CONFIG_STAGING is not set
CONFIG_X86_PLATFORM_DEVICES=y
# CONFIG_ACERHDF is not set
# CONFIG_ASUS_LAPTOP is not set
# CONFIG_FUJITSU_LAPTOP is not set
# CONFIG_FUJITSU_TABLET is not set
# CONFIG_HP_ACCEL is not set
# CONFIG_PANASONIC_LAPTOP is not set
# CONFIG_THINKPAD_ACPI is not set
# CONFIG_SENSORS_HDAPS is not set
# CONFIG_INTEL_MENLOW is not set
# CONFIG_EEEPC_LAPTOP is not set
# CONFIG_ACPI_WMI is not set
# CONFIG_TOPSTAR_LAPTOP is not set
# CONFIG_TOSHIBA_BT_RFKILL is not set
# CONFIG_ACPI_CMPC is not set
# CONFIG_INTEL_IPS is not set
# CONFIG_IBM_RTL is not set
# CONFIG_XO15_EBOOK is not set
# CONFIG_SAMSUNG_LAPTOP is not set
# CONFIG_SAMSUNG_Q10 is not set
# CONFIG_APPLE_GMUX is not set

#
# Hardware Spinlock drivers
#
CONFIG_CLKEVT_I8253=y
CONFIG_I8253_LOCK=y
CONFIG_CLKBLD_I8253=y
CONFIG_IOMMU_API=y
CONFIG_IOMMU_SUPPORT=y
# CONFIG_AMD_IOMMU is not set
CONFIG_DMAR_TABLE=y
CONFIG_INTEL_IOMMU=y
CONFIG_INTEL_IOMMU_DEFAULT_ON=y
CONFIG_INTEL_IOMMU_FLOPPY_WA=y
CONFIG_IRQ_REMAP=y

#
# Remoteproc drivers (EXPERIMENTAL)
#

#
# Rpmsg drivers (EXPERIMENTAL)
#
# CONFIG_VIRT_DRIVERS is not set
# CONFIG_PM_DEVFREQ is not set

#
# Firmware Drivers
#
# CONFIG_EDD is not set
CONFIG_FIRMWARE_MEMMAP=y
# CONFIG_DELL_RBU is not set
# CONFIG_DCDBAS is not set
CONFIG_DMIID=y
# CONFIG_DMI_SYSFS is not set
# CONFIG_ISCSI_IBFT_FIND is not set
# CONFIG_GOOGLE_FIRMWARE is not set

#
# File systems
#
CONFIG_DCACHE_WORD_ACCESS=y
CONFIG_EXT2_FS=y
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT2_FS_POSIX_ACL=y
# CONFIG_EXT2_FS_SECURITY is not set
# CONFIG_EXT2_FS_XIP is not set
CONFIG_EXT3_FS=y
# CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT3_FS_POSIX_ACL=y
# CONFIG_EXT3_FS_SECURITY is not set
CONFIG_EXT4_FS=y
# CONFIG_EXT4_FS_XATTR is not set
# CONFIG_EXT4_DEBUG is not set
CONFIG_JBD=y
# CONFIG_JBD_DEBUG is not set
CONFIG_JBD2=y
# CONFIG_JBD2_DEBUG is not set
CONFIG_FS_MBCACHE=y
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
# CONFIG_XFS_FS is not set
# CONFIG_GFS2_FS is not set
CONFIG_BTRFS_FS=m
# CONFIG_BTRFS_FS_POSIX_ACL is not set
# CONFIG_BTRFS_FS_CHECK_INTEGRITY is not set
# CONFIG_NILFS2_FS is not set
CONFIG_FS_POSIX_ACL=y
CONFIG_EXPORTFS=y
CONFIG_FILE_LOCKING=y
CONFIG_FSNOTIFY=y
CONFIG_DNOTIFY=y
CONFIG_INOTIFY_USER=y
# CONFIG_FANOTIFY is not set
# CONFIG_QUOTA is not set
# CONFIG_QUOTACTL is not set
# CONFIG_AUTOFS4_FS is not set
CONFIG_FUSE_FS=m
# CONFIG_CUSE is not set

#
# Caches
#
# CONFIG_FSCACHE is not set

#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=m
CONFIG_JOLIET=y
# CONFIG_ZISOFS is not set
CONFIG_UDF_FS=m
CONFIG_UDF_NLS=y

#
# DOS/FAT/NT Filesystems
#
CONFIG_FAT_FS=m
CONFIG_MSDOS_FS=m
CONFIG_VFAT_FS=m
CONFIG_FAT_DEFAULT_CODEPAGE=437
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
CONFIG_NTFS_FS=m
# CONFIG_NTFS_DEBUG is not set
# CONFIG_NTFS_RW is not set

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_SYSCTL=y
CONFIG_PROC_PAGE_MONITOR=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
# CONFIG_TMPFS_POSIX_ACL is not set
# CONFIG_TMPFS_XATTR is not set
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y
# CONFIG_CONFIGFS_FS is not set
CONFIG_MISC_FILESYSTEMS=y
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_HFSPLUS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_LOGFS is not set
# CONFIG_CRAMFS is not set
# CONFIG_SQUASHFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_MINIX_FS is not set
# CONFIG_OMFS_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_QNX6FS_FS is not set
# CONFIG_ROMFS_FS is not set
# CONFIG_PSTORE is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V3_ACL is not set
# CONFIG_NFS_V4 is not set
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
# CONFIG_NFSD_V3_ACL is not set
# CONFIG_NFSD_V4 is not set
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=y
# CONFIG_SUNRPC_DEBUG is not set
# CONFIG_CEPH_FS is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_AFS_FS is not set
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=m
# CONFIG_NLS_CODEPAGE_737 is not set
# CONFIG_NLS_CODEPAGE_775 is not set
CONFIG_NLS_CODEPAGE_850=m
# CONFIG_NLS_CODEPAGE_852 is not set
# CONFIG_NLS_CODEPAGE_855 is not set
# CONFIG_NLS_CODEPAGE_857 is not set
# CONFIG_NLS_CODEPAGE_860 is not set
# CONFIG_NLS_CODEPAGE_861 is not set
# CONFIG_NLS_CODEPAGE_862 is not set
# CONFIG_NLS_CODEPAGE_863 is not set
# CONFIG_NLS_CODEPAGE_864 is not set
CONFIG_NLS_CODEPAGE_865=m
# CONFIG_NLS_CODEPAGE_866 is not set
# CONFIG_NLS_CODEPAGE_869 is not set
# CONFIG_NLS_CODEPAGE_936 is not set
# CONFIG_NLS_CODEPAGE_950 is not set
# CONFIG_NLS_CODEPAGE_932 is not set
# CONFIG_NLS_CODEPAGE_949 is not set
# CONFIG_NLS_CODEPAGE_874 is not set
# CONFIG_NLS_ISO8859_8 is not set
CONFIG_NLS_CODEPAGE_1250=m
CONFIG_NLS_CODEPAGE_1251=m
# CONFIG_NLS_ASCII is not set
CONFIG_NLS_ISO8859_1=m
# CONFIG_NLS_ISO8859_2 is not set
# CONFIG_NLS_ISO8859_3 is not set
# CONFIG_NLS_ISO8859_4 is not set
# CONFIG_NLS_ISO8859_5 is not set
# CONFIG_NLS_ISO8859_6 is not set
# CONFIG_NLS_ISO8859_7 is not set
# CONFIG_NLS_ISO8859_9 is not set
# CONFIG_NLS_ISO8859_13 is not set
# CONFIG_NLS_ISO8859_14 is not set
CONFIG_NLS_ISO8859_15=m
# CONFIG_NLS_KOI8_R is not set
# CONFIG_NLS_KOI8_U is not set
CONFIG_NLS_UTF8=m

#
# Kernel hacking
#
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
# CONFIG_PRINTK_TIME is not set
CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4
# CONFIG_ENABLE_WARN_DEPRECATED is not set
# CONFIG_ENABLE_MUST_CHECK is not set
CONFIG_FRAME_WARN=2048
CONFIG_MAGIC_SYSRQ=y
# CONFIG_STRIP_ASM_SYMS is not set
CONFIG_UNUSED_SYMBOLS=y
CONFIG_DEBUG_FS=y
# CONFIG_HEADERS_CHECK is not set
# CONFIG_DEBUG_SECTION_MISMATCH is not set
CONFIG_DEBUG_KERNEL=y
# CONFIG_DEBUG_SHIRQ is not set
CONFIG_LOCKUP_DETECTOR=y
CONFIG_HARDLOCKUP_DETECTOR=y
# CONFIG_BOOTPARAM_HARDLOCKUP_PANIC is not set
CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE=0
# CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC is not set
CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE=0
CONFIG_DETECT_HUNG_TASK=y
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
CONFIG_SCHED_DEBUG=y
CONFIG_SCHEDSTATS=y
# CONFIG_TIMER_STATS is not set
# CONFIG_DEBUG_OBJECTS is not set
# CONFIG_DEBUG_SLAB is not set
# CONFIG_DEBUG_KMEMLEAK is not set
CONFIG_DEBUG_PREEMPT=y
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_RT_MUTEX_TESTER is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_LOCK_ALLOC is not set
# CONFIG_PROVE_LOCKING is not set
# CONFIG_SPARSE_RCU_POINTER is not set
# CONFIG_LOCK_STAT is not set
# CONFIG_DEBUG_ATOMIC_SLEEP is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
CONFIG_STACKTRACE=y
# CONFIG_DEBUG_STACK_USAGE is not set
# CONFIG_DEBUG_KOBJECT is not set
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
# CONFIG_DEBUG_INFO_REDUCED is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_VIRTUAL is not set
# CONFIG_DEBUG_WRITECOUNT is not set
CONFIG_DEBUG_MEMORY_INIT=y
# CONFIG_DEBUG_LIST is not set
# CONFIG_TEST_LIST_SORT is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_DEBUG_NOTIFIERS is not set
# CONFIG_DEBUG_CREDENTIALS is not set
CONFIG_ARCH_WANT_FRAME_POINTERS=y
CONFIG_FRAME_POINTER=y
# CONFIG_BOOT_PRINTK_DELAY is not set
# CONFIG_RCU_TORTURE_TEST is not set
CONFIG_RCU_CPU_STALL_TIMEOUT=60
CONFIG_RCU_CPU_STALL_VERBOSE=y
CONFIG_RCU_CPU_STALL_INFO=y
# CONFIG_RCU_TRACE is not set
# CONFIG_KPROBES_SANITY_TEST is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
# CONFIG_DEBUG_PER_CPU_MAPS is not set
# CONFIG_LKDTM is not set
# CONFIG_CPU_NOTIFIER_ERROR_INJECT is not set
# CONFIG_FAULT_INJECTION is not set
CONFIG_LATENCYTOP=y
# CONFIG_DEBUG_PAGEALLOC is not set
CONFIG_USER_STACKTRACE_SUPPORT=y
CONFIG_NOP_TRACER=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST=y
CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_HAVE_C_RECORDMCOUNT=y
CONFIG_RING_BUFFER=y
CONFIG_EVENT_TRACING=y
CONFIG_EVENT_POWER_TRACING_DEPRECATED=y
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_RING_BUFFER_ALLOW_SWAP=y
CONFIG_TRACING=y
CONFIG_GENERIC_TRACER=y
CONFIG_TRACING_SUPPORT=y
CONFIG_FTRACE=y
# CONFIG_FUNCTION_TRACER is not set
# CONFIG_IRQSOFF_TRACER is not set
# CONFIG_PREEMPT_TRACER is not set
# CONFIG_SCHED_TRACER is not set
# CONFIG_FTRACE_SYSCALLS is not set
CONFIG_BRANCH_PROFILE_NONE=y
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set
# CONFIG_PROFILE_ALL_BRANCHES is not set
# CONFIG_STACK_TRACER is not set
CONFIG_BLK_DEV_IO_TRACE=y
CONFIG_KPROBE_EVENT=y
# CONFIG_FTRACE_STARTUP_TEST is not set
# CONFIG_MMIOTRACE is not set
# CONFIG_RING_BUFFER_BENCHMARK is not set
# CONFIG_PROVIDE_OHCI1394_DMA_INIT is not set
CONFIG_FIREWIRE_OHCI_REMOTE_DMA=y
# CONFIG_DYNAMIC_DEBUG is not set
# CONFIG_DMA_API_DEBUG is not set
# CONFIG_ATOMIC64_SELFTEST is not set
# CONFIG_SAMPLES is not set
CONFIG_HAVE_ARCH_KGDB=y
# CONFIG_KGDB is not set
CONFIG_HAVE_ARCH_KMEMCHECK=y
# CONFIG_TEST_KSTRTOX is not set
# CONFIG_STRICT_DEVMEM is not set
CONFIG_X86_VERBOSE_BOOTUP=y
CONFIG_EARLY_PRINTK=y
# CONFIG_EARLY_PRINTK_DBGP is not set
# CONFIG_DEBUG_STACKOVERFLOW is not set
# CONFIG_X86_PTDUMP is not set
# CONFIG_DEBUG_RODATA is not set
# CONFIG_DEBUG_SET_MODULE_RONX is not set
# CONFIG_DEBUG_NX_TEST is not set
# CONFIG_IOMMU_DEBUG is not set
# CONFIG_IOMMU_STRESS is not set
CONFIG_HAVE_MMIOTRACE_SUPPORT=y
# CONFIG_X86_DECODER_SELFTEST is not set
CONFIG_IO_DELAY_TYPE_0X80=0
CONFIG_IO_DELAY_TYPE_0XED=1
CONFIG_IO_DELAY_TYPE_UDELAY=2
CONFIG_IO_DELAY_TYPE_NONE=3
# CONFIG_IO_DELAY_0X80 is not set
# CONFIG_IO_DELAY_0XED is not set
# CONFIG_IO_DELAY_UDELAY is not set
CONFIG_IO_DELAY_NONE=y
CONFIG_DEFAULT_IO_DELAY_TYPE=3
# CONFIG_DEBUG_BOOT_PARAMS is not set
# CONFIG_CPA_DEBUG is not set
# CONFIG_OPTIMIZE_INLINING is not set
# CONFIG_DEBUG_STRICT_USER_COPY_CHECKS is not set
# CONFIG_DEBUG_NMI_SELFTEST is not set

#
# Security options
#
# CONFIG_KEYS is not set
# CONFIG_SECURITY_DMESG_RESTRICT is not set
# CONFIG_SECURITY is not set
# CONFIG_SECURITYFS is not set
# CONFIG_INTEL_TXT is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_DEFAULT_SECURITY=""
CONFIG_CRYPTO=y

#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_ALGAPI2=y
CONFIG_CRYPTO_AEAD2=y
CONFIG_CRYPTO_BLKCIPHER=y
CONFIG_CRYPTO_BLKCIPHER2=y
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_HASH2=y
CONFIG_CRYPTO_RNG2=y
CONFIG_CRYPTO_PCOMP2=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MANAGER2=y
# CONFIG_CRYPTO_USER is not set
CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
# CONFIG_CRYPTO_GF128MUL is not set
# CONFIG_CRYPTO_NULL is not set
# CONFIG_CRYPTO_PCRYPT is not set
CONFIG_CRYPTO_WORKQUEUE=y
# CONFIG_CRYPTO_CRYPTD is not set
# CONFIG_CRYPTO_AUTHENC is not set
# CONFIG_CRYPTO_TEST is not set

#
# Authenticated Encryption with Associated Data
#
# CONFIG_CRYPTO_CCM is not set
# CONFIG_CRYPTO_GCM is not set
# CONFIG_CRYPTO_SEQIV is not set

#
# Block modes
#
CONFIG_CRYPTO_CBC=m
# CONFIG_CRYPTO_CTR is not set
# CONFIG_CRYPTO_CTS is not set
CONFIG_CRYPTO_ECB=y
# CONFIG_CRYPTO_LRW is not set
CONFIG_CRYPTO_PCBC=m
# CONFIG_CRYPTO_XTS is not set

#
# Hash modes
#
# CONFIG_CRYPTO_HMAC is not set
# CONFIG_CRYPTO_XCBC is not set
# CONFIG_CRYPTO_VMAC is not set

#
# Digest
#
CONFIG_CRYPTO_CRC32C=m
# CONFIG_CRYPTO_CRC32C_INTEL is not set
# CONFIG_CRYPTO_GHASH is not set
# CONFIG_CRYPTO_MD4 is not set
# CONFIG_CRYPTO_MD5 is not set
CONFIG_CRYPTO_MICHAEL_MIC=y
# CONFIG_CRYPTO_RMD128 is not set
# CONFIG_CRYPTO_RMD160 is not set
# CONFIG_CRYPTO_RMD256 is not set
# CONFIG_CRYPTO_RMD320 is not set
# CONFIG_CRYPTO_SHA1 is not set
# CONFIG_CRYPTO_SHA1_SSSE3 is not set
# CONFIG_CRYPTO_SHA256 is not set
# CONFIG_CRYPTO_SHA512 is not set
# CONFIG_CRYPTO_TGR192 is not set
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL is not set

#
# Ciphers
#
CONFIG_CRYPTO_AES=y
# CONFIG_CRYPTO_AES_X86_64 is not set
# CONFIG_CRYPTO_AES_NI_INTEL is not set
# CONFIG_CRYPTO_ANUBIS is not set
CONFIG_CRYPTO_ARC4=y
# CONFIG_CRYPTO_BLOWFISH is not set
# CONFIG_CRYPTO_BLOWFISH_X86_64 is not set
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_CAMELLIA_X86_64 is not set
# CONFIG_CRYPTO_CAST5 is not set
# CONFIG_CRYPTO_CAST6 is not set
# CONFIG_CRYPTO_DES is not set
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_KHAZAD is not set
# CONFIG_CRYPTO_SALSA20 is not set
# CONFIG_CRYPTO_SALSA20_X86_64 is not set
# CONFIG_CRYPTO_SEED is not set
# CONFIG_CRYPTO_SERPENT is not set
# CONFIG_CRYPTO_SERPENT_SSE2_X86_64 is not set
# CONFIG_CRYPTO_TEA is not set
# CONFIG_CRYPTO_TWOFISH is not set
# CONFIG_CRYPTO_TWOFISH_X86_64 is not set
# CONFIG_CRYPTO_TWOFISH_X86_64_3WAY is not set

#
# Compression
#
# CONFIG_CRYPTO_DEFLATE is not set
# CONFIG_CRYPTO_ZLIB is not set
# CONFIG_CRYPTO_LZO is not set

#
# Random Number Generation
#
# CONFIG_CRYPTO_ANSI_CPRNG is not set
# CONFIG_CRYPTO_USER_API_HASH is not set
# CONFIG_CRYPTO_USER_API_SKCIPHER is not set
CONFIG_CRYPTO_HW=y
# CONFIG_CRYPTO_DEV_PADLOCK is not set
CONFIG_HAVE_KVM=y
CONFIG_HAVE_KVM_IRQCHIP=y
CONFIG_HAVE_KVM_EVENTFD=y
CONFIG_KVM_APIC_ARCHITECTURE=y
CONFIG_KVM_MMIO=y
CONFIG_KVM_ASYNC_PF=y
CONFIG_VIRTUALIZATION=y
CONFIG_KVM=m
CONFIG_KVM_INTEL=m
# CONFIG_KVM_AMD is not set
# CONFIG_KVM_MMU_AUDIT is not set
# CONFIG_VHOST_NET is not set
CONFIG_BINARY_PRINTF=y

#
# Library routines
#
CONFIG_BITREVERSE=y
CONFIG_GENERIC_FIND_FIRST_BIT=y
CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_IO=y
# CONFIG_CRC_CCITT is not set
CONFIG_CRC16=y
CONFIG_CRC_T10DIF=y
CONFIG_CRC_ITU_T=y
CONFIG_CRC32=y
# CONFIG_CRC32_SELFTEST is not set
CONFIG_CRC32_SLICEBY8=y
# CONFIG_CRC32_SLICEBY4 is not set
# CONFIG_CRC32_SARWATE is not set
# CONFIG_CRC32_BIT is not set
# CONFIG_CRC7 is not set
CONFIG_LIBCRC32C=m
# CONFIG_CRC8 is not set
CONFIG_ZLIB_INFLATE=y
CONFIG_ZLIB_DEFLATE=m
CONFIG_LZO_COMPRESS=y
CONFIG_LZO_DECOMPRESS=y
# CONFIG_XZ_DEC is not set
# CONFIG_XZ_DEC_BCJ is not set
CONFIG_DECOMPRESS_GZIP=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_HAS_DMA=y
CONFIG_CPU_RMAP=y
CONFIG_DQL=y
CONFIG_NLATTR=y
CONFIG_AVERAGE=y
# CONFIG_CORDIC is not set

Re: [PATCHSET] block: per-queue policy activation, take#2

[Tejun Heo]

Hello, Jens.

On Fri, Apr 20, 2012 at 02:02:05PM +0200, Jens Axboe wrote:
> Tejun, everything merged in cleanly. A boot test didn't not go so well,
> I'm afraid. It complains about stuck RCU. Even with extra RCU
> debugging/info turned on, it doesn't give my any extra info.
> 
> Config is attached. I can try and debug this on Monday, for now I've
> pulled it out of for-next again.

Hmmm... it works fine with the same config here (qemu w/ 4 cpus
configured).  Doesn't stuck RCU usually come from unbalanced RCU
lock/unlocking?  That should trigger context or RCU warnings before
anything else, weird.  Anyways, it would be great if you can provide
more info on how to reproduce the problem.

Thanks.

-- 
tejun

Re: [PATCHSET] block: per-queue policy activation, take#2

[Jens Axboe]

On 2012-04-20 19:17, Tejun Heo wrote:
> Hello, Jens.
> 
> On Fri, Apr 20, 2012 at 02:02:05PM +0200, Jens Axboe wrote:
>> Tejun, everything merged in cleanly. A boot test didn't not go so well,
>> I'm afraid. It complains about stuck RCU. Even with extra RCU
>> debugging/info turned on, it doesn't give my any extra info.
>>
>> Config is attached. I can try and debug this on Monday, for now I've
>> pulled it out of for-next again.
> 
> Hmmm... it works fine with the same config here (qemu w/ 4 cpus
> configured).  Doesn't stuck RCU usually come from unbalanced RCU
> lock/unlocking?  That should trigger context or RCU warnings before
> anything else, weird.  Anyways, it would be great if you can provide
> more info on how to reproduce the problem.

The machine just sat there. I'll get some more info out of it and run a
bisect too.

-- 
Jens Axboe

Re: [PATCHSET] block: per-queue policy activation, take#2

[Tejun Heo]

On Fri, Apr 20, 2012 at 09:08:35PM +0200, Jens Axboe wrote:
> On 2012-04-20 19:17, Tejun Heo wrote:
> > Hello, Jens.
> > 
> > On Fri, Apr 20, 2012 at 02:02:05PM +0200, Jens Axboe wrote:
> >> Tejun, everything merged in cleanly. A boot test didn't not go so well,
> >> I'm afraid. It complains about stuck RCU. Even with extra RCU
> >> debugging/info turned on, it doesn't give my any extra info.
> >>
> >> Config is attached. I can try and debug this on Monday, for now I've
> >> pulled it out of for-next again.
> > 
> > Hmmm... it works fine with the same config here (qemu w/ 4 cpus
> > configured).  Doesn't stuck RCU usually come from unbalanced RCU
> > lock/unlocking?  That should trigger context or RCU warnings before
> > anything else, weird.  Anyways, it would be great if you can provide
> > more info on how to reproduce the problem.
> 
> The machine just sat there. I'll get some more info out of it and run a
> bisect too.

Any progress on this?

Thanks.

-- 
tejun