linux-kernel - Re: [PATCH 10/18] vdso: make arch_setup_additional_pages wait for mmap

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Date:	Fri, 11 Mar 2016 12:28:14 +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,
	Alex Deucher <alexander.deucher@....com>,
	Alex Thorlton <athorlton@....com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Christian König <christian.koenig@....com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	Davidlohr Bueso <dave@...olabs.net>,
	David Rientjes <rientjes@...gle.com>,
	"H . Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	linux-arch@...r.kernel.org, Mel Gorman <mgorman@...e.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Petr Cermak <petrcermak@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 10/18] vdso: make arch_setup_additional_pages wait for
 mmap_sem for write killable

On 02/29/2016 02:26 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> most architectures are relying on mmap_sem for write in their
> arch_setup_additional_pages. If the waiting task gets killed by the oom
> killer 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.
>
> Cc: linux-arch@...r.kernel.org
> Cc: Andy Lutomirski <luto@...capital.net>
> Signed-off-by: Michal Hocko <mhocko@...e.com>


I don't have much arch-specific insight, but looks OK.

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