From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070911200012.935811000@chello.nl> References: <20070911195350.825778000@chello.nl> Date: Tue, 11 Sep 2007 21:53:56 +0200 From: Peter Zijlstra Subject: [PATCH 06/23] lib: percpu_counter_set Content-Disposition: inline; filename=percpu_counter_set.patch Sender: owner-linux-mm@kvack.org Return-Path: 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 List-ID: Provide a method to set a percpu counter to a specified value. Signed-off-by: Peter Zijlstra --- include/linux/percpu_counter.h | 6 ++++++ lib/percpu_counter.c | 14 ++++++++++++++ 2 files changed, 20 insertions(+) Index: linux-2.6/include/linux/percpu_counter.h =================================================================== --- linux-2.6.orig/include/linux/percpu_counter.h +++ linux-2.6/include/linux/percpu_counter.h @@ -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_add(struct percpu_counter *fbc, s64 amount, s32 batch); s64 percpu_counter_sum(struct percpu_counter *fbc); @@ -75,6 +76,11 @@ static inline void percpu_counter_destro { } +static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount) +{ + fbc->count = amount; +} + #define __percpu_counter_add(fbc, amount, batch) \ percpu_counter_add(fbc, amount) Index: linux-2.6/lib/percpu_counter.c =================================================================== --- linux-2.6.orig/lib/percpu_counter.c +++ linux-2.6/lib/percpu_counter.c @@ -14,6 +14,20 @@ 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); +} +EXPORT_SYMBOL(percpu_counter_set); + void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) { s64 count; -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org