From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 29 Sep 2008 20:44:36 +0900 From: Daisuke Nishimura Subject: Re: [PATCH 4/4] memcg: optimze cpustat Message-Id: <20080929204436.ee3fce0b.nishimura@mxp.nes.nec.co.jp> In-Reply-To: <20080929192430.e93d4f21.kamezawa.hiroyu@jp.fujitsu.com> References: <20080929191927.caabec89.kamezawa.hiroyu@jp.fujitsu.com> <20080929192430.e93d4f21.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: KAMEZAWA Hiroyuki Cc: nishimura@mxp.nes.nec.co.jp, "linux-mm@kvack.org" , LKML , "balbir@linux.vnet.ibm.com" , "xemul@openvz.org" , Andrew Morton List-ID: On Mon, 29 Sep 2008 19:24:30 +0900, KAMEZAWA Hiroyuki wrote: > 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 success. > > Changlog: v5->v6 > - patch series was reordered and needs some adjustment. no changes in logic. > Changelog v3->v4: > - merged with an other leaf patch. > > Signed-off-by: KAMEZAWA Hiroyuki > Acked-by: Balbir Singh > > Reviewed-by: Daisuke Nishimura I'll test with all the patches applied tonight. Thanks, Daisuke Nishimura. > mm/memcontrol.c | 18 ++++++++++-------- > 1 file changed, 10 insertions(+), 8 deletions(-) > > Index: mmotm-2.6.27-rc7+/mm/memcontrol.c > =================================================================== > --- mmotm-2.6.27-rc7+.orig/mm/memcontrol.c > +++ mmotm-2.6.27-rc7+/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 > { > 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(stru > 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; > > -- 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