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Date:	Thu, 20 Dec 2012 13:29:35 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Mel Gorman <mgorman@...e.de>, Jens Axboe <axboe@...nel.dk>
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<hughd@...gle.com>  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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