linux-kernel - Re: [PATCH] fix mem_cgroup_split_huge

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Message-Id: <20111122093622.eba8bbef.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 22 Nov 2011 09:36:22 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Balbir Singh <bsingharora@...il.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>, cgroups@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>, mhocko@...e.cz,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH] fix mem_cgroup_split_huge_fixup to work efficiently.

On Mon, 21 Nov 2011 16:30:11 +0530
Balbir Singh <bsingharora@...il.com> wrote:

> On Thu, Nov 17, 2011 at 7:03 AM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > I'll send this again when mm is shipped.
> > I sometimes see mem_cgroup_split_huge_fixup() in perf report and noticed
> > it's very slow. This fixes it. Any comments are welcome.
> >
> 
> How do you see this - what tests?
> 
Sometimes. By applications calling fork() or mremap(), mprotect(), which
will cause split_huge_page(). 
But not 100% reporoducable, yet.

Thanks,
-Kame

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