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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2008-10-18 20:28:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-20 08:52:39 -0700 |
| commit | addb9efebb2ee2202d324e75b593b39868528f68 (patch) | |
| tree | 0d0a6b3c4ce3e3b668adab9f463957e506e9b733 /mm | |
| parent | 5b4e655e948d8b6e9b0d001616d4c9d7e7ffe924 (diff) | |
| download | linux-stable-addb9efebb2ee2202d324e75b593b39868528f68.tar.gz linux-stable-addb9efebb2ee2202d324e75b593b39868528f68.tar.bz2 linux-stable-addb9efebb2ee2202d324e75b593b39868528f68.zip | |
memcg: optimize per-cpu statistics
Some obvious optimization to memcg.
I found mem_cgroup_charge_statistics() is a little big (in object) and
does unnecessary address calclation. This patch is for optimization to
reduce the size of this function.
And res_counter_charge() is 'likely' to succeed.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 6f8b5b3b38b2..10846b9656aa 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -66,11 +66,10 @@ struct mem_cgroup_stat { /* * For accounting under irq disable, no need for increment preempt count. */ -static void __mem_cgroup_stat_add_safe(struct mem_cgroup_stat *stat, +static inline void __mem_cgroup_stat_add_safe(struct mem_cgroup_stat_cpu *stat, enum mem_cgroup_stat_index idx, int val) { - int cpu = smp_processor_id(); - stat->cpustat[cpu].count[idx] += val; + stat->count[idx] += val; } static s64 mem_cgroup_read_stat(struct mem_cgroup_stat *stat, @@ -190,18 +189,21 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, int flags, { int val = (charge)? 1 : -1; struct mem_cgroup_stat *stat = &mem->stat; + struct mem_cgroup_stat_cpu *cpustat; VM_BUG_ON(!irqs_disabled()); + + cpustat = &stat->cpustat[smp_processor_id()]; if (flags & PAGE_CGROUP_FLAG_CACHE) - __mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_CACHE, val); + __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_CACHE, val); else - __mem_cgroup_stat_add_safe(stat, MEM_CGROUP_STAT_RSS, val); + __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, val); if (charge) - __mem_cgroup_stat_add_safe(stat, + __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_PGPGIN_COUNT, 1); else - __mem_cgroup_stat_add_safe(stat, + __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_PGPGOUT_COUNT, 1); } @@ -558,7 +560,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, css_get(&memcg->css); } - while (res_counter_charge(&mem->res, PAGE_SIZE)) { + while (unlikely(res_counter_charge(&mem->res, PAGE_SIZE))) { if (!(gfp_mask & __GFP_WAIT)) goto out; |