linux-kernel - Re: [PATCH] use oom_killer

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Message-Id: <20110426121719.95894bc5.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 26 Apr 2011 12:17:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] use oom_killer_disabled in all oom pathes

On Tue, 26 Apr 2011 11:19:22 +0800
Dave Young <hidave.darkstar@...il.com> wrote:

> On Tue, Apr 26, 2011 at 11:14 AM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
> >> On Tue, Apr 26, 2011 at 10:57 AM, KOSAKI Motohiro
> >> <kosaki.motohiro@...fujitsu.com> wrote:
> >> >> oom_killer_disable should be a global switch, also fit for oom paths
> >> >> other than __alloc_pages_slowpath
> >> >>
> >> >> Here add it to mem_cgroup_handle_oom and pagefault_out_of_memory as well.
> >> >
> >> > Can you please explain more? Why should? Now oom_killer_disabled is used
> >> > only hibernation path. so, Why pagefault and memcg allocation will be happen?
> >>
> >> Indeed I'm using it in virtio balloon test, oom killer triggered when
> >> memory pressure is high.
> >>
> >> literally oom_killer_disabled scope should be global, isn't it?
> >
> > ok. virtio baloon seems fair usage. if you add new usage of oom_killer_disabled
> > into the patch description, I'll ack this one.
> 
> Thanks, then I will resend the virtio balloon patch along with this.
> 

Amount of free memory doesn't affect memory cgroup's OOM because it just works
against the limit. So, the code for memcg isn't necessary.


Thanks,
-Kame

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