From: Izik Eidus <ieidus@redhat.com>
To: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/3] ksm: unmerge is an origin of OOMs
Date: Mon, 07 Sep 2009 19:42:17 +0300 [thread overview]
Message-ID: <4AA537E9.8030800@redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0909052222430.7387@sister.anvils>
Hugh Dickins wrote:
> Just as the swapoff system call allocates many pages of RAM to various
> processes, perhaps triggering OOM, so "echo 2 >/sys/kernel/mm/ksm/run"
> (unmerge) is liable to allocate many pages of RAM to various processes,
> perhaps triggering OOM; and each is normally run from a modest admin
> process (swapoff or shell), easily repeated until it succeeds.
>
> So treat unmerge_and_remove_all_rmap_items() in the same way that we
> treat try_to_unuse(): generalize PF_SWAPOFF to PF_OOM_ORIGIN, and
> bracket both with that, to ask the OOM killer to kill them first,
> to prevent them from spawning more and more OOM kills.
>
> Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
> ---
>
Acked-by: Izik Eidus <ieidus@redhat.com>
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next prev parent reply other threads:[~2009-09-07 16:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-05 21:22 [PATCH 1/3] ksm: clean up obsolete references Hugh Dickins
2009-09-05 21:25 ` [PATCH 2/3] ksm: unmerge is an origin of OOMs Hugh Dickins
2009-09-07 16:42 ` Izik Eidus [this message]
2009-09-07 16:42 ` Izik Eidus
2009-09-05 21:26 ` [PATCH 3/3] ksm: mremap use err from ksm_madvise Hugh Dickins
2009-09-07 16:54 ` Izik Eidus
2009-09-07 16:36 ` [PATCH 1/3] ksm: clean up obsolete references Izik Eidus
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