linux-ext4 - Re: How to handle TIF

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Message-ID: <alpine.DEB.2.10.1502231332550.21127@chino.kir.corp.google.com>
Date:	Mon, 23 Feb 2015 13:33:51 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Johannes Weiner <hannes@...xchg.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Ts'o <tytso@....edu>,
	Dave Chinner <david@...morbit.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	mhocko@...e.cz, dchinner@...hat.com, linux-mm@...ck.org,
	oleg@...hat.com, mgorman@...e.de, torvalds@...ux-foundation.org,
	xfs@....sgi.com, linux-ext4@...r.kernel.org
Subject: Re: How to handle TIF_MEMDIE stalls?

On Sat, 21 Feb 2015, Johannes Weiner wrote:

> From: Johannes Weiner <hannes@...xchg.org>
> 
> mm: page_alloc: revert inadvertent !__GFP_FS retry behavior change
> 
> Historically, !__GFP_FS allocations were not allowed to invoke the OOM
> killer once reclaim had failed, but nevertheless kept looping in the
> allocator.  9879de7373fc ("mm: page_alloc: embed OOM killing naturally
> into allocation slowpath"), which should have been a simple cleanup
> patch, accidentally changed the behavior to aborting the allocation at
> that point.  This creates problems with filesystem callers (?) that
> currently rely on the allocator waiting for other tasks to intervene.
> 
> Revert the behavior as it shouldn't have been changed as part of a
> cleanup patch.
> 
> Fixes: 9879de7373fc ("mm: page_alloc: embed OOM killing naturally into allocation slowpath")
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Cc: stable@...r.kernel.org [3.19]
Acked-by: David Rientjes <rientjes@...gle.com>
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