linux-kernel - Re: [PATCH -resend] jbd2: revert must-not-fail allocation loops back to GFP

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Date:	Mon, 8 Jun 2015 10:54:32 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-ext4@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -resend] jbd2: revert must-not-fail allocation loops back
 to GFP_NOFAIL

On Mon, Jun 08, 2015 at 03:28:44PM +0200, Michal Hocko wrote:
> This basically reverts 47def82672b3 (jbd2: Remove __GFP_NOFAIL from jbd2
> layer). The deprecation of __GFP_NOFAIL was a bad choice because it led
> to open coding the endless loop around the allocator rather than
> removing the dependency on the non failing allocation. So the
> deprecation was a clear failure and the reality tells us that
> __GFP_NOFAIL is not even close to go away.
> 
> It is still true that __GFP_NOFAIL allocations are generally discouraged
> and new uses should be evaluated and an alternative (pre-allocations or
> reservations) should be considered but it doesn't make any sense to lie
> the allocator about the requirements. Allocator can take steps to help
> making a progress if it knows the requirements.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>
> Acked-by: David Rientjes <rientjes@...gle.com>

Applied, thanks.

						- Ted
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