linux-kernel - Re: [PATCH] splice: use mapping_gfp

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Date:	Fri, 4 Apr 2008 13:46:09 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] splice: use mapping_gfp_mask

On Thu, Apr 03 2008, Hugh Dickins wrote:
> The loop block driver is careful to mask __GFP_IO|__GFP_FS out of its
> mapping_gfp_mask, to avoid hangs under memory pressure.  But nowadays
> it uses splice, usually going through __generic_file_splice_read.  That
> must use mapping_gfp_mask instead of GFP_KERNEL to avoid those hangs.
> 
> Signed-off-by: Hugh Dickins <hugh@...itas.com>
> ---
> Ought to go into 2.6.25.  For 2.6.23 and 2.6.24 stable?  Well, I've
> not actually seen this hang on any of these, though presumably it's
> lurking there.  Where I did see it, and test the fix, was 2.6.25-rc5-mm1:
> whose SLUB had a disturbing predilection (since corrected) for order-4
> allocations, even when allocating radix tree nodes.

Thanks Hugh, definitely correct! I see it's already merged, so all is
well.

-- 
Jens Axboe

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