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

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Date:	Fri, 4 Apr 2008 22:54:32 +0200
From:	"Oliver Pinter" <oliver.pntr@...il.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>
Cc:	"Hugh Dickins" <hugh@...itas.com>,
	"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

hi all!

this patch for 2.6.22.y ?

if i good see, the __generic_file_splice_read bring out to 2.6.22 ..

http://repo.or.cz/w/linux-2.6.22.y-op-patches.git
http://repo.or.cz/w/linux-2.6.22.y-op.git

On 4/4/08, Jens Axboe <jens.axboe@...cle.com> wrote:
> 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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-- 
Thanks,
Oliver
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