linux-kernel - Re: [PATCH] mm, proc: make clear

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Message-ID: <56E2A517.9040703@suse.cz>
Date:	Fri, 11 Mar 2016 11:59:35 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Michal Hocko <mhocko@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Michal Hocko <mhocko@...e.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Petr Cermak <petrcermak@...omium.org>
Subject: Re: [PATCH] mm, proc: make clear_refs killable

On 02/29/2016 06:56 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> CLEAR_REFS_MM_HIWATER_RSS and CLEAR_REFS_SOFT_DIRTY are relying on
> mmap_sem for write. If the waiting task gets killed by the oom killer
> and it would operate on the current's mm it would block oom_reaper from
> asynchronous address space reclaim and reduce the chances of timely OOM
> resolving. Wait for the lock in the killable mode and return with EINTR
> if the task got killed while waiting. This will also expedite the return
> to the userspace and do_exit even if the mm is remote.
>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Petr Cermak <petrcermak@...omium.org>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>