From: Greg Thelen <gthelen@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
containers@lists.osdl.org, linux-fsdevel@vger.kernel.org,
Andrea Righi <arighi@develer.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
Minchan Kim <minchan.kim@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Ciju Rajan K <ciju@linux.vnet.ibm.com>,
David Rientjes <rientjes@google.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Vivek Goyal <vgoyal@redhat.com>,
Dave Chinner <david@fromorbit.com>,
Greg Thelen <gthelen@google.com>
Subject: [PATCH v8 03/12] memcg: add mem_cgroup_mark_inode_dirty()
Date: Fri, 3 Jun 2011 09:12:09 -0700 [thread overview]
Message-ID: <1307117538-14317-4-git-send-email-gthelen@google.com> (raw)
In-Reply-To: <1307117538-14317-1-git-send-email-gthelen@google.com>
Create the mem_cgroup_mark_inode_dirty() routine, which is called when
an inode is marked dirty. In kernels without memcg, this is an inline
no-op.
Add i_memcg field to struct address_space. When an inode is marked
dirty with mem_cgroup_mark_inode_dirty(), the css_id of current memcg is
recorded in i_memcg. Per-memcg writeback (introduced in a latter
change) uses this field to isolate inodes associated with a particular
memcg.
The type of i_memcg is an 'unsigned short' because it stores the css_id
of the memcg. Using a struct mem_cgroup pointer would be larger and
also create a reference on the memcg which would hang memcg rmdir
deletion. Usage of a css_id is not a reference so cgroup deletion is
not affected. The memcg can be deleted without cleaning up the i_memcg
field. When a memcg is deleted its pages are recharged to the cgroup
parent, and the related inode(s) are marked as shared thus
disassociating the inodes from the deleted cgroup.
A mem_cgroup_mark_inode_dirty() tracepoint is also included to allow for
easier understanding of memcg writeback operation.
Signed-off-by: Greg Thelen <gthelen@google.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
fs/fs-writeback.c | 2 ++
fs/inode.c | 3 +++
include/linux/fs.h | 9 +++++++++
include/linux/memcontrol.h | 6 ++++++
include/trace/events/memcontrol.h | 32 ++++++++++++++++++++++++++++++++
mm/memcontrol.c | 24 ++++++++++++++++++++++++
6 files changed, 76 insertions(+), 0 deletions(-)
create mode 100644 include/trace/events/memcontrol.h
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 3392c29..0174fcf 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/fs.h>
+#include <linux/memcontrol.h>
#include <linux/mm.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
@@ -1111,6 +1112,7 @@ void __mark_inode_dirty(struct inode *inode, int flags)
spin_lock(&bdi->wb.list_lock);
inode->dirtied_when = jiffies;
list_move(&inode->i_wb_list, &bdi->wb.b_dirty);
+ mem_cgroup_mark_inode_dirty(inode);
spin_unlock(&bdi->wb.list_lock);
if (wakeup_bdi)
diff --git a/fs/inode.c b/fs/inode.c
index ce61a1b..9ecb0bb 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -228,6 +228,9 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
mapping->assoc_mapping = NULL;
mapping->backing_dev_info = &default_backing_dev_info;
mapping->writeback_index = 0;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+ mapping->i_memcg = 0;
+#endif
/*
* If the block_device provides a backing_dev_info for client
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 29c02f6..deabca3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -645,6 +645,9 @@ struct address_space {
spinlock_t private_lock; /* for use by the address_space */
struct list_head private_list; /* ditto */
struct address_space *assoc_mapping; /* ditto */
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+ unsigned short i_memcg; /* css_id of memcg dirtier */
+#endif
} __attribute__((aligned(sizeof(long))));
/*
* On most architectures that alignment is already the case; but
@@ -652,6 +655,12 @@ struct address_space {
* of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON.
*/
+/*
+ * When an address_space is shared by multiple memcg dirtieres, then i_memcg is
+ * set to this special, wildcard, css_id value (zero).
+ */
+#define I_MEMCG_SHARED 0
+
struct block_device {
dev_t bd_dev; /* not a kdev_t - it's a search key */
int bd_openers;
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 77e47f5..14b6d67 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -103,6 +103,8 @@ mem_cgroup_prepare_migration(struct page *page,
extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
struct page *oldpage, struct page *newpage, bool migration_ok);
+void mem_cgroup_mark_inode_dirty(struct inode *inode);
+
/*
* For memory reclaim.
*/
@@ -273,6 +275,10 @@ static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
{
}
+static inline void mem_cgroup_mark_inode_dirty(struct inode *inode)
+{
+}
+
static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
{
return 0;
diff --git a/include/trace/events/memcontrol.h b/include/trace/events/memcontrol.h
new file mode 100644
index 0000000..781ef9fc
--- /dev/null
+++ b/include/trace/events/memcontrol.h
@@ -0,0 +1,32 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM memcontrol
+
+#if !defined(_TRACE_MEMCONTROL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MEMCONTROL_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(mem_cgroup_mark_inode_dirty,
+ TP_PROTO(struct inode *inode),
+
+ TP_ARGS(inode),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, ino)
+ __field(unsigned short, css_id)
+ ),
+
+ TP_fast_assign(
+ __entry->ino = inode->i_ino;
+ __entry->css_id =
+ inode->i_mapping ? inode->i_mapping->i_memcg : 0;
+ ),
+
+ TP_printk("ino=%ld css_id=%d", __entry->ino, __entry->css_id)
+)
+
+#endif /* _TRACE_MEMCONTROL_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index bf642b5..e83ef74 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -54,6 +54,9 @@
#include <trace/events/vmscan.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/memcontrol.h>
+
struct cgroup_subsys mem_cgroup_subsys __read_mostly;
#define MEM_CGROUP_RECLAIM_RETRIES 5
struct mem_cgroup *root_mem_cgroup __read_mostly;
@@ -1122,6 +1125,27 @@ static int calc_inactive_ratio(struct mem_cgroup *memcg, unsigned long *present_
return inactive_ratio;
}
+/*
+ * Mark the current task's memcg as the memcg associated with inode. Note: the
+ * recorded cgroup css_id is not guaranteed to remain correct. The current task
+ * may be moved to another cgroup. The memcg may also be deleted before the
+ * caller has time to use the i_memcg.
+ */
+void mem_cgroup_mark_inode_dirty(struct inode *inode)
+{
+ struct mem_cgroup *mem;
+ unsigned short id;
+
+ rcu_read_lock();
+ mem = mem_cgroup_from_task(current);
+ id = mem ? css_id(&mem->css) : 0;
+ rcu_read_unlock();
+
+ inode->i_mapping->i_memcg = id;
+
+ trace_mem_cgroup_mark_inode_dirty(inode);
+}
+
int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)
{
unsigned long active;
--
1.7.3.1
next prev parent reply other threads:[~2011-06-03 16:13 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-03 16:12 [PATCH v8 00/12] memcg: per cgroup dirty page accounting Greg Thelen
2011-06-03 16:12 ` [PATCH v8 01/12] memcg: document cgroup dirty memory interfaces Greg Thelen
2011-06-04 9:54 ` Minchan Kim
2011-06-03 16:12 ` [PATCH v8 02/12] memcg: add page_cgroup flags for dirty page tracking Greg Thelen
2011-06-04 9:56 ` Minchan Kim
2011-06-03 16:12 ` Greg Thelen [this message]
2011-06-03 23:09 ` [PATCH v8 03/12] memcg: add mem_cgroup_mark_inode_dirty() Andrea Righi
2011-06-03 23:45 ` Greg Thelen
2011-06-07 7:27 ` KAMEZAWA Hiroyuki
2011-06-03 16:12 ` [PATCH v8 04/12] memcg: add dirty page accounting infrastructure Greg Thelen
2011-06-04 10:11 ` Minchan Kim
2011-06-07 7:28 ` KAMEZAWA Hiroyuki
2011-06-03 16:12 ` [PATCH v8 05/12] memcg: add kernel calls for memcg dirty page stats Greg Thelen
2011-06-04 15:42 ` Minchan Kim
2011-06-03 16:12 ` [PATCH v8 06/12] memcg: add dirty limits to mem_cgroup Greg Thelen
2011-06-04 15:57 ` Minchan Kim
2011-06-03 16:12 ` [PATCH v8 07/12] memcg: add cgroupfs interface to memcg dirty limits Greg Thelen
2011-06-04 16:04 ` Minchan Kim
2011-06-03 16:12 ` [PATCH v8 08/12] memcg: dirty page accounting support routines Greg Thelen
2011-06-07 7:44 ` KAMEZAWA Hiroyuki
2011-06-03 16:12 ` [PATCH v8 09/12] memcg: create support routines for writeback Greg Thelen
2011-06-05 2:46 ` Minchan Kim
2011-06-07 7:46 ` KAMEZAWA Hiroyuki
2011-06-03 16:12 ` [PATCH v8 10/12] memcg: create support routines for page-writeback Greg Thelen
2011-06-05 3:11 ` Minchan Kim
2011-06-06 18:47 ` Greg Thelen
2011-06-07 8:50 ` KAMEZAWA Hiroyuki
2011-06-07 15:58 ` Greg Thelen
2011-06-08 0:01 ` KAMEZAWA Hiroyuki
2011-06-08 1:50 ` Greg Thelen
2011-06-03 16:12 ` [PATCH v8 11/12] writeback: make background writeback cgroup aware Greg Thelen
2011-06-05 4:11 ` Minchan Kim
2011-06-06 18:51 ` Greg Thelen
2011-06-07 8:56 ` KAMEZAWA Hiroyuki
2011-06-07 19:38 ` Vivek Goyal
2011-06-07 19:42 ` Vivek Goyal
2011-06-07 20:43 ` Greg Thelen
2011-06-07 21:05 ` Vivek Goyal
2011-06-08 0:18 ` KAMEZAWA Hiroyuki
2011-06-08 4:02 ` Greg Thelen
2011-06-08 4:03 ` KAMEZAWA Hiroyuki
2011-06-08 5:20 ` Greg Thelen
2011-06-08 20:42 ` Vivek Goyal
2011-06-08 20:39 ` Vivek Goyal
2011-06-09 17:55 ` Greg Thelen
2011-06-09 21:26 ` Vivek Goyal
2011-06-09 22:21 ` Greg Thelen
2011-06-03 22:46 ` [PATCH v8 00/12] memcg: per cgroup dirty page accounting Hiroyuki Kamezawa
2011-06-03 22:50 ` Greg Thelen
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