From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Johannes Weiner <jweiner@redhat.com>,
linux-mm@kvack.org
Subject: Re: [patch v2] thp, memcg: split hugepage for memcg oom on cow
Date: Tue, 10 Apr 2012 14:59:28 +0900 [thread overview]
Message-ID: <4F83CC40.7030406@jp.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1204092242050.27689@chino.kir.corp.google.com>
(2012/04/10 14:42), David Rientjes wrote:
> On COW, a new hugepage is allocated and charged to the memcg. If the
> system is oom or the charge to the memcg fails, however, the fault
> handler will return VM_FAULT_OOM which results in an oom kill.
>
> Instead, it's possible to fallback to splitting the hugepage so that the
> COW results only in an order-0 page being allocated and charged to the
> memcg which has a higher liklihood to succeed. This is expensive because
> the hugepage must be split in the page fault handler, but it is much
> better than unnecessarily oom killing a process.
>
> Signed-off-by: David Rientjes <rientjes@google.com>
Seems nice to me.
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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next prev parent reply other threads:[~2012-04-10 6:01 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-04 1:56 [patch] thp, memcg: split hugepage for memcg oom on cow David Rientjes
2012-04-09 9:10 ` KAMEZAWA Hiroyuki
2012-04-10 0:23 ` David Rientjes
2012-04-10 0:43 ` KAMEZAWA Hiroyuki
2012-04-10 0:49 ` KAMEZAWA Hiroyuki
2012-04-10 5:41 ` David Rientjes
2012-04-10 5:42 ` [patch v2] " David Rientjes
2012-04-10 5:59 ` KAMEZAWA Hiroyuki [this message]
2012-04-11 14:20 ` Johannes Weiner
2012-04-23 23:15 ` David Rientjes
2012-04-25 21:01 ` David Rientjes
2012-04-26 9:06 ` Johannes Weiner
2012-04-26 21:05 ` David Rientjes
2012-04-27 0:15 ` Johannes Weiner
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