From: Konstantin Khlebnikov <khlebnikov@openvz.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>,
linux-kernel@vger.kernel.org, Mel Gorman <mgorman@suse.de>,
Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH] mm/swap: add independed bio pool for swap
Date: Thu, 20 Dec 2012 13:29:35 +0400 [thread overview]
Message-ID: <50D2DA7F.3030902@openvz.org> (raw)
In-Reply-To: <20121219165343.ccb3a956.akpm@linux-foundation.org>
Andrew Morton wrote:
> On Mon, 17 Dec 2012 20:45:13 -0800 (PST)
> Hugh Dickins<hughd@google.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...
prev parent reply other threads:[~2012-12-20 9:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-14 11:01 [PATCH] mm/swap: add independed bio pool for swap Konstantin Khlebnikov
2012-12-18 4:45 ` Hugh Dickins
2012-12-20 0:53 ` Andrew Morton
2012-12-20 9:29 ` Konstantin Khlebnikov [this message]
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