From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de,
dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com,
a.p.zijlstra@chello.nl, nikita@clusterfs.com,
trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com,
richard@rsk.demon.co.uk, torvalds@linux-foundation.org
Subject: [PATCH 20/23] lib: floating proportions _single
Date: Fri, 03 Aug 2007 14:37:33 +0200 [thread overview]
Message-ID: <20070803125237.453095000@chello.nl> (raw)
In-Reply-To: 20070803123712.987126000@chello.nl
[-- Attachment #1: proportions_single.patch --]
[-- Type: text/plain, Size: 9491 bytes --]
Provide a prop_local that does not use a percpu variable for its counter.
This is useful for items that are not (or infrequently) accessed from
multiple context and/or are plenty enought that the percpu_counter overhead
will hurt (tasks).
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
include/linux/proportions.h | 113 +++++++++++++++++++++++++++++++++++++--
lib/proportions.c | 125 ++++++++++++++++++++++++++++++++++++++++----
2 files changed, 220 insertions(+), 18 deletions(-)
Index: linux-2.6/include/linux/proportions.h
===================================================================
--- linux-2.6.orig/include/linux/proportions.h
+++ linux-2.6/include/linux/proportions.h
@@ -45,7 +45,11 @@ void prop_change_shift(struct prop_descr
struct prop_global *prop_get_global(struct prop_descriptor *pd);
void prop_put_global(struct prop_descriptor *pd, struct prop_global *pg);
-struct prop_local {
+/*
+ * ----- PERCPU ------
+ */
+
+struct prop_local_percpu {
/*
* the local events counter
*/
@@ -59,23 +63,118 @@ struct prop_local {
spinlock_t lock; /* protect the snapshot state */
};
-int prop_local_init(struct prop_local *pl);
-void prop_local_destroy(struct prop_local *pl);
+int prop_local_init_percpu(struct prop_local_percpu *pl);
+void prop_local_destroy_percpu(struct prop_local_percpu *pl);
-void prop_norm(struct prop_global *pg, struct prop_local *pl);
+void prop_norm_percpu(struct prop_global *pg, struct prop_local_percpu *pl);
/*
* ++x_{j}, ++t
*/
static inline
-void __prop_inc(struct prop_global *pg, struct prop_local *pl)
+void __prop_inc_percpu(struct prop_global *pg, struct prop_local_percpu *pl)
{
- prop_norm(pg, pl);
+ prop_norm_percpu(pg, pl);
percpu_counter_add(&pl->events, 1);
percpu_counter_add(&pg->events, 1);
}
-void prop_fraction(struct prop_global *pg, struct prop_local *pl,
+void prop_fraction_percpu(struct prop_global *pg, struct prop_local_percpu *pl,
+ long *numerator, long *denominator);
+
+/*
+ * ----- SINGLE ------
+ */
+
+struct prop_local_single {
+ /*
+ * the local events counter
+ */
+ unsigned long events;
+
+ /*
+ * snapshot of the last seen global state
+ * and a lock protecting this state
+ */
+ int shift;
+ unsigned long period;
+ spinlock_t lock; /* protect the snapshot state */
+};
+
+int prop_local_init_single(struct prop_local_single *pl);
+void prop_local_destroy_single(struct prop_local_single *pl);
+
+void prop_norm_single(struct prop_global *pg, struct prop_local_single *pl);
+
+/*
+ * ++x_{j}, ++t
+ */
+static inline
+void __prop_inc_single(struct prop_global *pg, struct prop_local_single *pl)
+{
+ prop_norm_single(pg, pl);
+ pl->events++;
+ percpu_counter_add(&pg->events, 1);
+}
+
+void prop_fraction_single(struct prop_global *pg, struct prop_local_single *pl,
long *numerator, long *denominator);
+/*
+ * ----- GLUE ------
+ */
+
+#undef TYPE_EQUAL
+#define TYPE_EQUAL(expr, type) \
+ __builtin_types_compatible_p(typeof(expr), type)
+
+extern int __bad_prop_local(void);
+
+#define prop_local_init(prop_local) \
+({ int err; \
+ if (TYPE_EQUAL(*(prop_local), struct prop_local_percpu)) \
+ err = prop_local_init_percpu( \
+ (struct prop_local_percpu *)(prop_local)); \
+ else if (TYPE_EQUAL(*(prop_local), struct prop_local_single)) \
+ err = prop_local_init_single( \
+ (struct prop_local_single *)(prop_local)); \
+ else __bad_prop_local(); \
+ err; \
+})
+
+#define prop_local_destroy(prop_local) \
+do { \
+ if (TYPE_EQUAL(*(prop_local), struct prop_local_percpu)) \
+ prop_local_destroy_percpu( \
+ (struct prop_local_percpu *)(prop_local)); \
+ else if (TYPE_EQUAL(*(prop_local), struct prop_local_single)) \
+ prop_local_destroy_single( \
+ (struct prop_local_single *)(prop_local)); \
+ else __bad_prop_local(); \
+} while (0)
+
+#define __prop_inc(prop_global, prop_local) \
+do { \
+ if (TYPE_EQUAL(*(prop_local), struct prop_local_percpu)) \
+ __prop_inc_percpu(prop_global, \
+ (struct prop_local_percpu *)(prop_local)); \
+ else if (TYPE_EQUAL(*(prop_local), struct prop_local_single)) \
+ __prop_inc_single(prop_global, \
+ (struct prop_local_single *)(prop_local)); \
+ else __bad_prop_local(); \
+} while (0)
+
+#define prop_fraction(prop_global, prop_local, num, denom) \
+do { \
+ if (TYPE_EQUAL(*(prop_local), struct prop_local_percpu)) \
+ prop_fraction_percpu(prop_global, \
+ (struct prop_local_percpu *)(prop_local), \
+ num, denom); \
+ else if (TYPE_EQUAL(*(prop_local), struct prop_local_single)) \
+ prop_fraction_single(prop_global, \
+ (struct prop_local_single *)(prop_local), \
+ num, denom); \
+ else __bad_prop_local(); \
+} while (0)
+
#endif /* _LINUX_PROPORTIONS_H */
Index: linux-2.6/lib/proportions.c
===================================================================
--- linux-2.6.orig/lib/proportions.c
+++ linux-2.6/lib/proportions.c
@@ -158,22 +158,31 @@ void prop_put_global(struct prop_descrip
rcu_read_unlock();
}
-static void prop_adjust_shift(struct prop_local *pl, int new_shift)
+static void
+__prop_adjust_shift(int *pl_shift, unsigned long *pl_period, int new_shift)
{
- int offset = pl->shift - new_shift;
+ int offset = *pl_shift - new_shift;
if (!offset)
return;
if (offset < 0)
- pl->period <<= -offset;
+ *pl_period <<= -offset;
else
- pl->period >>= offset;
+ *pl_period >>= offset;
- pl->shift = new_shift;
+ *pl_shift = new_shift;
}
-int prop_local_init(struct prop_local *pl)
+#define prop_adjust_shift(prop_local, pg_shift) \
+ __prop_adjust_shift(&(prop_local)->shift, \
+ &(prop_local)->period, pg_shift)
+
+/*
+ * PERCPU
+ */
+
+int prop_local_init_percpu(struct prop_local_percpu *pl)
{
spin_lock_init(&pl->lock);
pl->shift = 0;
@@ -181,7 +190,7 @@ int prop_local_init(struct prop_local *p
return percpu_counter_init_irq(&pl->events, 0);
}
-void prop_local_destroy(struct prop_local *pl)
+void prop_local_destroy_percpu(struct prop_local_percpu *pl)
{
percpu_counter_destroy(&pl->events);
}
@@ -193,8 +202,7 @@ void prop_local_destroy(struct prop_loca
* x_{j} -= x_{j}/2;
* c_{j}++;
*/
-void prop_norm(struct prop_global *pg,
- struct prop_local *pl)
+void prop_norm_percpu(struct prop_global *pg, struct prop_local_percpu *pl)
{
unsigned long period = 1UL << (pg->shift - 1);
unsigned long period_mask = ~(period - 1);
@@ -247,17 +255,112 @@ void prop_norm(struct prop_global *pg,
*
* p_{j} = x_{j} / (period/2 + t % period/2)
*/
-void prop_fraction(struct prop_global *pg, struct prop_local *pl,
+void prop_fraction_percpu(struct prop_global *pg, struct prop_local_percpu *pl,
long *numerator, long *denominator)
{
unsigned long period_2 = 1UL << (pg->shift - 1);
unsigned long counter_mask = period_2 - 1;
unsigned long global_count;
- prop_norm(pg, pl);
+ prop_norm_percpu(pg, pl);
*numerator = percpu_counter_read_positive(&pl->events);
global_count = percpu_counter_read(&pg->events);
*denominator = period_2 + (global_count & counter_mask);
}
+/*
+ * SINGLE
+ */
+
+int prop_local_init_single(struct prop_local_single *pl)
+{
+ spin_lock_init(&pl->lock);
+ pl->shift = 0;
+ pl->period = 0;
+ pl->events = 0;
+ return 0;
+}
+
+void prop_local_destroy_single(struct prop_local_single *pl)
+{
+}
+
+/*
+ * Catch up with missed period expirations.
+ *
+ * until (c_{j} == c)
+ * x_{j} -= x_{j}/2;
+ * c_{j}++;
+ */
+void prop_norm_single(struct prop_global *pg, struct prop_local_single *pl)
+{
+ unsigned long period = 1UL << (pg->shift - 1);
+ unsigned long period_mask = ~(period - 1);
+ unsigned long global_period;
+ unsigned long flags;
+
+ global_period = percpu_counter_read(&pg->events);
+ global_period &= period_mask;
+
+ /*
+ * Fast path - check if the local and global period count still match
+ * outside of the lock.
+ */
+ if (pl->period == global_period)
+ return;
+
+ spin_lock_irqsave(&pl->lock, flags);
+ prop_adjust_shift(pl, pg->shift);
+ /*
+ * For each missed period, we half the local counter.
+ * basically:
+ * pl->events >> (global_period - pl->period);
+ *
+ * but since the distributed nature of single counters make division
+ * rather hard, use a regular subtraction loop. This is safe, because
+ * the events will only every be incremented, hence the subtraction
+ * can never result in a negative number.
+ */
+ while (pl->period != global_period) {
+ unsigned long val = pl->events;
+ unsigned long half = (val + 1) >> 1;
+
+ /*
+ * Half of zero won't be much less, break out.
+ * This limits the loop to shift iterations, even
+ * if we missed a million.
+ */
+ if (!val)
+ break;
+
+ /*
+ * Iff shift >32 half might exceed the limits of
+ * the regular single_counter_mod.
+ */
+ pl->events -= half;
+ pl->period += period;
+ }
+ pl->period = global_period;
+ spin_unlock_irqrestore(&pl->lock, flags);
+}
+
+/*
+ * Obtain an fraction of this proportion
+ *
+ * p_{j} = x_{j} / (period/2 + t % period/2)
+ */
+void prop_fraction_single(struct prop_global *pg, struct prop_local_single *pl,
+ long *numerator, long *denominator)
+{
+ unsigned long period_2 = 1UL << (pg->shift - 1);
+ unsigned long counter_mask = period_2 - 1;
+ unsigned long global_count;
+
+ prop_norm_single(pg, pl);
+ *numerator = pl->events;
+
+ global_count = percpu_counter_read(&pg->events);
+ *denominator = period_2 + (global_count & counter_mask);
+}
+
--
next prev parent reply other threads:[~2007-08-03 12:58 UTC|newest]
Thread overview: 188+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-03 12:37 [PATCH 00/23] per device dirty throttling -v8 Peter Zijlstra
2007-08-03 12:37 ` [PATCH 01/23] nfs: remove congestion_end() Peter Zijlstra
2007-08-03 12:37 ` [PATCH 02/23] lib: percpu_counter_add Peter Zijlstra
2007-08-03 12:37 ` [PATCH 03/23] lib: percpu_counter variable batch Peter Zijlstra
2007-08-03 12:37 ` [PATCH 04/23] lib: make percpu_counter_add take s64 Peter Zijlstra
2007-08-03 12:37 ` [PATCH 05/23] lib: percpu_counter_set Peter Zijlstra
2007-08-03 12:37 ` [PATCH 06/23] lib: percpu_counter_sum_positive Peter Zijlstra
2007-08-03 12:37 ` [PATCH 07/23] lib: percpu_count_sum() Peter Zijlstra
2007-08-03 12:37 ` [PATCH 08/23] lib: percpu_counter_init error handling Peter Zijlstra
2007-08-03 12:37 ` [PATCH 09/23] lib: percpu_counter_init_irq Peter Zijlstra
2007-08-03 12:37 ` [PATCH 10/23] mm: bdi init hooks Peter Zijlstra
2007-08-03 12:37 ` [PATCH 11/23] containers: " Peter Zijlstra
2007-08-03 12:37 ` [PATCH 12/23] mtd: " Peter Zijlstra
2007-08-03 12:37 ` [PATCH 13/23] mtd: clean up the backing_dev_info usage Peter Zijlstra
2007-08-03 12:37 ` [PATCH 14/23] mtd: give mtdconcat devices their own backing_dev_info Peter Zijlstra
2007-08-03 12:37 ` [PATCH 15/23] mm: scalable bdi statistics counters Peter Zijlstra
2007-08-03 12:37 ` [PATCH 16/23] mm: count reclaimable pages per BDI Peter Zijlstra
2007-08-03 12:37 ` [PATCH 17/23] mm: count writeback " Peter Zijlstra
2007-08-09 19:15 ` Christoph Lameter
2007-08-09 19:23 ` Peter Zijlstra
2007-08-09 19:27 ` Christoph Lameter
2007-08-13 8:36 ` Peter Zijlstra
2007-08-03 12:37 ` [PATCH 18/23] mm: expose BDI statistics in sysfs Peter Zijlstra
2007-08-03 12:37 ` [PATCH 19/23] lib: floating proportions Peter Zijlstra
2007-08-03 12:37 ` Peter Zijlstra [this message]
2007-08-03 12:37 ` [PATCH 21/23] mm: per device dirty threshold Peter Zijlstra
2007-08-03 12:37 ` [PATCH 22/23] mm: dirty balancing for tasks Peter Zijlstra
2007-08-03 12:37 ` [PATCH 23/23] debug: sysfs files for the current ratio/size/total Peter Zijlstra
2007-08-03 22:21 ` [PATCH 00/23] per device dirty throttling -v8 Linus Torvalds
2007-08-04 6:32 ` Ingo Molnar
2007-08-04 7:07 ` Ingo Molnar
2007-08-04 7:44 ` david
2007-08-04 16:01 ` Ray Lee
2007-08-04 17:15 ` david
2007-08-09 5:11 ` david
2007-08-04 10:33 ` Ingo Molnar
2007-08-04 16:17 ` Linus Torvalds
2007-08-04 16:37 ` Ingo Molnar
2007-08-04 16:51 ` Andrew Morton
2007-08-04 16:56 ` Ingo Molnar
2007-08-04 20:23 ` Alan Cox
2007-08-04 17:02 ` Diego Calleja
2007-08-04 17:17 ` Ingo Molnar
2007-08-04 17:38 ` Diego Calleja
2007-08-04 17:51 ` Diego Calleja
2007-08-08 10:43 ` Karel Zak
2007-08-04 17:39 ` Linus Torvalds
2007-08-04 18:08 ` Jeff Garzik
2007-08-04 19:12 ` Jörn Engel
2007-08-04 19:21 ` Ingo Molnar
2007-08-04 19:26 ` Jörn Engel
2007-08-04 19:42 ` Jörn Engel
2007-08-05 20:36 ` Christoph Hellwig
2007-08-06 18:03 ` Chuck Ebbert
2007-08-06 18:53 ` Jeff Garzik
2007-08-06 19:37 ` Alan Cox
2007-08-06 19:46 ` Chuck Ebbert
2007-08-07 7:05 ` Ingo Molnar
2007-08-08 21:10 ` Martin J. Bligh
2007-08-08 21:21 ` Andrew Morton
2007-08-09 0:54 ` Martin Bligh
2007-08-11 23:14 ` Valerie Henson
2007-08-10 0:21 ` Bill Davidsen
2007-08-14 9:57 ` Helge Hafting
2007-08-04 19:47 ` Linus Torvalds
2007-08-04 19:49 ` Linus Torvalds
2007-08-04 20:00 ` Ingo Molnar
2007-08-04 20:11 ` Ingo Molnar
2007-08-04 20:13 ` Arjan van de Ven
2007-08-05 8:18 ` [patch] add noatime/atime boot options, CONFIG_DEFAULT_NOATIME Ingo Molnar
2007-08-04 20:13 ` [PATCH 00/23] per device dirty throttling -v8 Arjan van de Ven
2007-08-04 21:48 ` Theodore Tso
2007-08-05 18:01 ` Arjan van de Ven
2007-08-05 20:34 ` Christoph Hellwig
[not found] ` <fa.7rstQpXif2z9y2n2HD+qxLFnueg@ifi.uio.no>
[not found] ` <fa.6VOZrceT65Vh8CIRIta0zSg2V38@ifi.uio.no>
[not found] ` <fa.xcZCTa5cHDOhrcyXZ2gZbzbu7g0@ifi.uio.no>
[not found] ` <fa.JjZwG90x+07YaOx8h5VLN+9AL/8@ifi.uio.no>
[not found] ` <fa.V9U4mAEXVjNqblhzu7GRmxif7Uw@ifi.uio.no>
[not found] ` <fa.uq0BQtrgp66a08hpsF+vrqXUNC4@ifi.uio.no>
2007-08-15 18:16 ` david.balazic
2007-08-04 20:11 ` [PATCH 00/23] " Alan Cox
2007-08-04 20:28 ` Jeff Garzik
2007-08-04 21:47 ` Alan Cox
2007-08-04 23:51 ` Claudio Martins
2007-08-05 0:49 ` Alan Cox
2007-08-05 7:28 ` Ingo Molnar
2007-08-05 10:29 ` Jakob Oestergaard
2007-08-05 12:46 ` Alan Cox
2007-08-05 12:58 ` Ingo Molnar
2007-08-05 13:29 ` Willy Tarreau
2007-08-06 6:57 ` Ingo Molnar
2007-08-06 13:12 ` Willy Tarreau
2007-08-05 14:46 ` Theodore Tso
2007-08-05 17:55 ` Ingo Molnar
2007-08-05 17:59 ` Jeff Garzik
2007-08-05 18:09 ` Ingo Molnar
2007-08-05 18:08 ` Arjan van de Ven
2007-08-07 21:20 ` Bill Davidsen
2007-08-05 7:18 ` Ingo Molnar
2007-08-07 18:55 ` Bill Davidsen
2007-08-07 19:35 ` Alan Cox
2007-08-08 17:44 ` Bill Davidsen
2007-08-04 20:28 ` Ingo Molnar
2007-08-04 20:34 ` Arjan van de Ven
2007-08-04 21:03 ` Ingo Molnar
2007-08-04 21:51 ` Alan Cox
2007-08-05 7:21 ` Ingo Molnar
2007-08-05 7:29 ` Andrew Morton
2007-08-05 7:39 ` Ingo Molnar
2007-08-05 8:53 ` Willy Tarreau
2007-08-05 14:17 ` Jörn Engel
2007-08-05 18:02 ` Arjan van de Ven
2007-08-05 18:37 ` Jörn Engel
2007-08-05 20:21 ` Jörn Engel
2007-08-05 20:33 ` Andrew Morton
2007-08-05 12:47 ` Alan Cox
2007-08-05 12:56 ` Ingo Molnar
2007-08-05 18:44 ` Dave Jones
2007-08-05 18:58 ` adi
2007-08-06 6:39 ` Ingo Molnar
2007-08-06 15:59 ` Dave Jones
2007-08-06 16:16 ` Ingo Molnar
2007-08-05 7:37 ` Ingo Molnar
2007-08-05 9:04 ` Jeff Garzik
2007-08-05 12:43 ` Alan Cox
2007-08-05 12:54 ` Ingo Molnar
2007-08-05 13:37 ` Alan Cox
2007-08-05 18:08 ` Ingo Molnar
2007-08-05 19:11 ` Alan Cox
2007-08-08 18:22 ` Bill Davidsen
2007-08-08 19:39 ` Jeff Garzik
2007-08-08 20:31 ` Bill Davidsen
2007-08-08 23:18 ` Alan Cox
2007-08-07 19:09 ` Bill Davidsen
2007-08-04 21:48 ` Alan Cox
2007-08-05 7:13 ` Ingo Molnar
2007-08-05 13:22 ` Diego Calleja
2007-08-05 19:03 ` david
2007-08-06 6:52 ` Ingo Molnar
2007-08-10 4:04 ` Bill Davidsen
2007-08-11 5:19 ` Valdis.Kletnieks
2007-08-06 6:58 ` Ingo Molnar
2007-08-09 0:57 ` Greg Trounson
2007-08-09 1:26 ` david
2007-08-09 2:33 ` Andi Kleen
2007-08-04 22:39 ` Ilpo Järvinen
2007-08-05 10:20 ` Jakob Oestergaard
2007-08-05 10:42 ` Jeff Garzik
2007-08-05 10:58 ` Jakob Oestergaard
2007-08-05 12:46 ` Ingo Molnar
2007-08-05 13:46 ` Jakob Oestergaard
2007-08-05 16:45 ` Linus Torvalds
2007-08-05 19:09 ` Ingo Molnar
2007-08-05 19:22 ` [patch] implement smarter atime updates support Ingo Molnar
2007-08-05 19:28 ` [patch] implement smarter atime updates support, v2 Ingo Molnar
2007-08-05 20:42 ` Theodore Tso
2007-08-06 5:36 ` Ingo Molnar
2007-08-05 19:53 ` [patch] implement smarter atime updates support Arjan van de Ven
2007-08-05 20:04 ` Alan Cox
2007-08-05 20:22 ` Arjan van de Ven
2007-08-05 19:29 ` [PATCH 00/23] per device dirty throttling -v8 Alan Cox
2007-08-05 19:32 ` Ingo Molnar
2007-08-05 23:43 ` David Chinner
2007-08-05 0:26 ` Andi Kleen
2007-08-05 15:00 ` Theodore Tso
2007-08-06 13:47 ` Chris Mason
2007-08-17 0:45 ` Dave Jones
2007-08-05 20:41 ` Christoph Hellwig
2007-08-06 10:42 ` Andi Kleen
2007-08-16 10:18 ` Helge Hafting
2007-08-09 6:25 ` Lionel Elie Mamane
2007-08-09 15:02 ` Chuck Ebbert
2007-08-09 16:22 ` Diego Calleja
2007-08-04 16:41 ` Andrew Morton
2007-08-04 17:26 ` Nikita Danilov
2007-08-04 19:16 ` Florian Weimer
2007-08-05 6:00 ` Andrew Morton
2007-08-05 7:57 ` Florian Weimer
2007-08-05 20:43 ` Christoph Hellwig
2007-08-05 22:46 ` Theodore Tso
2007-08-06 0:24 ` David Chinner
2007-08-05 0:28 ` Andi Kleen
2007-08-04 16:15 ` Linus Torvalds
2007-08-05 17:22 ` Brice Figureau
2007-08-05 22:17 ` Andi Kleen
2007-08-06 8:40 ` Brice Figureau
2007-08-14 1:44 ` Stewart Smith
2007-08-14 2:25 ` Andi Kleen
2007-08-14 7:59 ` Brice Figureau
2007-08-06 20:26 ` Miklos Szeredi
2007-08-08 12:25 ` richard kennedy
2007-08-08 13:54 ` Andi Kleen
2007-08-10 4:17 ` Bill Davidsen
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