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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... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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