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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,
	andrea@suse.de
Subject: [PATCH 04/17] lib: percpu_counter_set
Date: Thu, 14 Jun 2007 23:58:21 +0200	[thread overview]
Message-ID: <20070614220446.614501106@chello.nl> (raw)
In-Reply-To: 20070614215817.389524447@chello.nl

[-- Attachment #1: percpu_counter_set.patch --]
[-- Type: text/plain, Size: 1979 bytes --]

Provide a method to set a percpu counter to a specified value.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 include/linux/percpu_counter.h |    6 ++++++
 lib/percpu_counter.c           |   13 +++++++++++++
 2 files changed, 19 insertions(+)

Index: linux-2.6/include/linux/percpu_counter.h
===================================================================
--- linux-2.6.orig/include/linux/percpu_counter.h	2007-05-23 20:37:41.000000000 +0200
+++ linux-2.6/include/linux/percpu_counter.h	2007-05-23 20:37:54.000000000 +0200
@@ -32,6 +32,7 @@ struct percpu_counter {
 
 void percpu_counter_init(struct percpu_counter *fbc, s64 amount);
 void percpu_counter_destroy(struct percpu_counter *fbc);
+void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
 void __percpu_counter_mod(struct percpu_counter *fbc, s32 amount, s32 batch);
 void __percpu_counter_mod64(struct percpu_counter *fbc, s64 amount, s32 batch);
 s64 percpu_counter_sum(struct percpu_counter *fbc);
@@ -81,6 +82,11 @@ static inline void percpu_counter_destro
 {
 }
 
+static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
+{
+	fbc->count = amount;
+}
+
 #define __percpu_counter_mod(fbc, amount, batch) \
 	percpu_counter_mod(fbc, amount)
 
Index: linux-2.6/lib/percpu_counter.c
===================================================================
--- linux-2.6.orig/lib/percpu_counter.c	2007-05-23 20:37:34.000000000 +0200
+++ linux-2.6/lib/percpu_counter.c	2007-05-23 20:38:03.000000000 +0200
@@ -14,6 +14,19 @@ static LIST_HEAD(percpu_counters);
 static DEFINE_MUTEX(percpu_counters_lock);
 #endif
 
+void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
+{
+	int cpu;
+
+	spin_lock(&fbc->lock);
+	for_each_possible_cpu(cpu) {
+		s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
+		*pcount = 0;
+	}
+	fbc->count = amount;
+	spin_unlock(&fbc->lock);
+}
+
 void __percpu_counter_mod(struct percpu_counter *fbc, s32 amount, s32 batch)
 {
 	long count;

-- 


  parent reply	other threads:[~2007-06-14 22:10 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-14 21:58 [PATCH 00/17] per device dirty throttling -v7 Peter Zijlstra
2007-06-14 21:58 ` [PATCH 01/17] nfs: remove congestion_end() Peter Zijlstra
2007-06-14 21:58 ` [PATCH 02/17] lib: percpu_counter variable batch Peter Zijlstra
2007-06-14 21:58 ` [PATCH 03/17] lib: percpu_counter_mod64 Peter Zijlstra
2007-06-14 21:58 ` Peter Zijlstra [this message]
2007-06-14 21:58 ` [PATCH 05/17] lib: percpu_count_sum_signed() Peter Zijlstra
2007-07-17 16:32   ` Josef Sipek
2007-07-17 16:35     ` Josef Sipek
2007-06-14 21:58 ` [PATCH 06/17] lib: percpu_counter_init_irq Peter Zijlstra
2007-07-17 16:35   ` Josef Sipek
2007-06-14 21:58 ` [PATCH 07/17] mm: bdi init hooks Peter Zijlstra
2007-06-14 21:58 ` [PATCH 08/17] containers: " Peter Zijlstra
2007-06-14 21:58 ` [PATCH 09/17] mtd: give mtdconcat devices their own backing_dev_info Peter Zijlstra
2007-06-14 21:58 ` [PATCH 10/17] mm: scalable bdi statistics counters Peter Zijlstra
2007-06-14 21:58 ` [PATCH 11/17] mm: count reclaimable pages per BDI Peter Zijlstra
2007-06-14 21:58 ` [PATCH 12/17] mm: count writeback " Peter Zijlstra
2007-06-14 21:58 ` [PATCH 13/17] mm: expose BDI statistics in sysfs Peter Zijlstra
2007-06-14 21:58 ` [PATCH 14/17] lib: floating proportions Peter Zijlstra
2007-06-14 21:58 ` [PATCH 15/17] lib: floating proportions _single Peter Zijlstra
2007-06-14 21:58 ` [PATCH 16/17] mm: per device dirty threshold Peter Zijlstra
2007-06-14 21:58 ` [PATCH 17/17] mm: dirty balancing for tasks Peter Zijlstra
2007-06-14 23:14 ` [PATCH 00/17] per device dirty throttling -v7 Andrew Morton
2007-07-17 10:10 ` Miklos Szeredi

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