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Message-Id: <200709181147.45006.nickpiggin@yahoo.com.au> Date: Tue, 18 Sep 2007 11:47:44 +1000 From: Nick Piggin <nickpiggin@...oo.com.au> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH] mm: use pagevec to rotate reclaimable page On Wednesday 19 September 2007 03:44, Andrew Morton wrote: > On Tue, 18 Sep 2007 11:29:50 +1000 Nick Piggin <nickpiggin@...oo.com.au> wrote: > > It would be interesting to test -mm kernels. They have a patch which > > reduces zone lock contention quite a lot. > > They do? Which patch? Hmm... mm-buffered-write-cleanup.patch. > > I think your patch is a nice idea, and with less zone lock contention in > > other areas, it is possible that it might produce a relatively larger > > improvement. > > I'm a bit wobbly about this patch - it adds additional single-cpu overhead > to reduce multiple-cpu overhead and latency. Yeah, that's true. Although maybe it gets significantly more after the patch in -mm. Possibly other page batching sites have similar issues on UP... I wonder if a type of pagevec that turns into a noop on UP would be interesting... probably totally unmeasurable and not worth the cost of code maintenance ;) - 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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