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Date: Sun, 27 Dec 2009 22:22:20 -0500 From: Rik van Riel <riel@...hat.com> To: Minchan Kim <minchan.kim@...il.com> CC: Andrew Morton <akpm@...ux-foundation.org>, lkml <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, Hugh Dickins <hugh.dickins@...cali.co.uk>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> Subject: Re: [PATCH -mmotm-2009-12-10-17-19] Prevent churning of zero page in LRU list. On 12/27/2009 09:53 PM, Minchan Kim wrote: > > VM doesn't add zero page to LRU list. > It means zero page's churning in LRU list is pointless. > > As a matter of fact, zero page can't be promoted by mark_page_accessed > since it doesn't have PG_lru. > > This patch prevent unecessary mark_page_accessed call of zero page > alghouth caller want FOLL_TOUCH. > > Signed-off-by: Minchan Kim<minchan.kim@...il.com> The code looks correct, but I wonder how frequently we run into the zero page in this code, vs. how much the added cost is of having this extra code in follow_page. What kind of problem were you running into that motivated you to write this patch? -- All rights reversed. -- 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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