linux-kernel - Re: [BUGFIX][PATCH 0/4] Fixes for memcg with THP

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Date:	Sat, 29 Jan 2011 18:17:56 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [BUGFIX][PATCH 0/4] Fixes for memcg with THP

On Fri, Jan 28, 2011 at 8:52 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
>
> On recent -mm, when I run make -j 8 under 200M limit of memcg, as
> ==
> # mount -t cgroup none /cgroup/memory -o memory
> # mkdir /cgroup/memory/A
> # echo 200M > /cgroup/memory/A/memory.limit_in_bytes
> # echo $$ > /cgroup/memory/A/tasks
> # make -j 8 kernel
> ==
>
> I see hangs with khugepaged. That's because memcg's memory reclaim
> routine doesn't handle HUGE_PAGE request in proper way. And khugepaged
> doesn't know about memcg.
>
> This patch set is for fixing above hang. Patch 1-3 seems obvious and
> has the same concept as patches in RHEL.

Do you have any backtraces? Are they in the specific patches?

Balbir
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