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Date:	Thu, 20 Dec 2012 13:29:35 +0400
From:	Konstantin Khlebnikov <>
To:	Andrew Morton <>
CC:	Hugh Dickins <>,,
	Mel Gorman <>, Jens Axboe <>
Subject: Re: [PATCH] mm/swap: add independed bio pool for swap

Andrew Morton wrote:
> On Mon, 17 Dec 2012 20:45:13 -0800 (PST)
> Hugh Dickins<>  wrote:
>> On Fri, 14 Dec 2012, Konstantin Khlebnikov wrote:
>>> This bio pool guarantees reclaiming progress for anonymous pages.
>>> All avaliable bio in fs_bio_set may be borrowed by writeback which may
>>> never ends, because disk too slow or broken. I have seen this situation in
>>> real life in system where was a lot of bio requests to a loop device which
>>> laying on top of special fuse-based filesystem.
>> Hmm, perhaps, I'm not at all sure.
> It probably maybe perhaps makes sense.  Of course, you're screwed if
> one of your swap devices is "disk too slow or broken".
> My crystal ball tells me that the 2015 kernel will have a bioset per
> physical device...

I predict that they also will be per-cpu. Well... probably maybe we should
just wait for this shining future. I leave this to your discretion...
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