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Date: Sun, 28 Feb 2010 12:49:14 -0500 From: Rik van Riel <riel@...hat.com> To: Johannes Weiner <hannes@...xchg.org> CC: Andrew Morton <akpm@...ux-foundation.org>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Minchan Kim <minchan.kim@...il.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: mm: used-once mapped file page detection On 02/26/2010 09:32 AM, Johannes Weiner wrote: > On Wed, Feb 24, 2010 at 01:39:46PM -0800, Andrew Morton wrote: >> On Mon, 22 Feb 2010 20:49:07 +0100 Johannes Weiner<hannes@...xchg.org> wrote: >> >>> This patch makes the VM be more careful about activating mapped file >>> pages in the first place. The minimum granted lifetime without >>> another memory access becomes an inactive list cycle instead of the >>> full memory cycle, which is more natural given the mentioned loads. >> >> iirc from a long time ago, the insta-activation of mapped pages was >> done because people were getting peeved about having their interactive >> applications (X, browser, etc) getting paged out, and bumping the pages >> immediately was found to help with this subjective problem. >> >> So it was a latency issue more than a throughput issue. I wouldn't be >> surprised if we get some complaints from people for the same reasons as >> a result of this patch. > > Agreed. Although we now have other things in place to protect them once > they are active (VM_EXEC protection, lazy active list scanning). You think we'll need VM_EXEC protection on the inactive list after your changes? -- 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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