From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andi Kleen <andi@firstfloor.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
"lizf@cn.fujitsu.com" <lizf@cn.fujitsu.com>,
"nishimura@mxp.nes.nec.co.jp" <nishimura@mxp.nes.nec.co.jp>,
"menage@google.com" <menage@google.com>,
linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC][PATCH 0/4] memcg: add support for hwpoison testing
Date: Tue, 1 Sep 2009 22:01:52 +0530 [thread overview]
Message-ID: <20090901163152.GC5022@balbir.in.ibm.com> (raw)
In-Reply-To: <20090901085549.GA4454@localhost>
* Wu Fengguang <fengguang.wu@intel.com> [2009-09-01 16:55:49]:
> > My point is that memcg can show 'owner' of pages but the page may
> > be shared with something important task _and_ if a task is migrated,
> > its pages' memcg information is not updated now. Then, you can kill
> > a task which is not in memcg.
>
> Ah thanks! I'm not aware of that tricky fact, and it does make a
> very good reason not to use memcg, although I guess locked page won't
> be migrated.
>
I think what Kamezawa-San is pointing to is that the task can migrate,
leaving behind the page in the memcg and poisioning those pages can
kill a task outside the memcg.
--
Balbir
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next prev parent reply other threads:[~2009-09-01 16:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-31 10:26 [RFC][PATCH 0/4] memcg: add support for hwpoison testing Wu Fengguang
2009-08-31 10:26 ` [RFC][PATCH 1/4] memcg: show memory.id in cgroupfs Wu Fengguang
2009-08-31 10:26 ` [RFC][PATCH 2/4] memcg: rename and export try_get_mem_cgroup_from_page() Wu Fengguang
2009-08-31 10:26 ` [RFC][PATCH 3/4] memcg: add accessor to mem_cgroup.css Wu Fengguang
2009-08-31 10:26 ` [RFC][PATCH 4/4] HWPOISON: memory cgroup based hwpoison injection filtering Wu Fengguang
2009-08-31 12:49 ` [RFC][PATCH 0/4] memcg: add support for hwpoison testing Balbir Singh
2009-08-31 12:59 ` Wu Fengguang
2009-08-31 23:46 ` KAMEZAWA Hiroyuki
2009-09-01 2:25 ` Wu Fengguang
2009-09-01 2:32 ` KAMEZAWA Hiroyuki
2009-09-01 6:46 ` Wu Fengguang
2009-09-01 7:12 ` KAMEZAWA Hiroyuki
2009-09-01 8:55 ` Wu Fengguang
2009-09-01 16:31 ` Balbir Singh [this message]
2009-09-02 2:47 ` Wu Fengguang
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