From: Michal Hocko <mhocko@kernel.org>
To: David Rientjes <rientjes@google.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
gregkh@linuxfoundation.org, linux-mm@kvack.org
Subject: Re: [PATCH] android, lmk: Send SIGKILL before setting TIF_MEMDIE.
Date: Fri, 11 Sep 2015 15:51:51 +0200 [thread overview]
Message-ID: <20150911135151.GK3417@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.10.1509091454020.20924@chino.kir.corp.google.com>
On Wed 09-09-15 14:55:59, David Rientjes wrote:
> On Sun, 6 Sep 2015, Tetsuo Handa wrote:
>
> > It was observed that setting TIF_MEMDIE before sending SIGKILL at
> > oom_kill_process() allows memory reserves to be depleted by allocations
> > which are not needed for terminating the OOM victim.
> >
>
> I don't understand what you are trying to fix. Sending a SIGKILL first
> does not guarantee that it is handling that signal before accessing memory
> reserves.
Yes it doesn't guarantee that but it kicks the task from userspace so
that it cannot deplete the memory reserves from the _userspace_ under
its controll. It still can consume some amount of memory from the kernel
but that shouldn't be under control of the task.
--
Michal Hocko
SUSE Labs
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prev parent reply other threads:[~2015-09-11 13:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-06 5:25 Tetsuo Handa
2015-09-09 21:55 ` David Rientjes
2015-09-11 13:51 ` Michal Hocko [this message]
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