From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Piggin Subject: Re: [PATCH] mm: use pagevec to rotate reclaimable page Date: Tue, 18 Sep 2007 11:47:44 +1000 References: <6.0.0.20.2.20070907113025.024dfbb8@172.19.0.2> <200709181129.50253.nickpiggin@yahoo.com.au> <20070918104435.2ba25ff3.akpm@linux-foundation.org> In-Reply-To: <20070918104435.2ba25ff3.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200709181147.45006.nickpiggin@yahoo.com.au> Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: Hisashi Hifumi , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wednesday 19 September 2007 03:44, Andrew Morton wrote: > On Tue, 18 Sep 2007 11:29:50 +1000 Nick Piggin 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org