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Date: Thu, 18 Sep 2008 18:23:03 -0400 From: Chris Snook <csnook@...hat.com> To: Christoph Lameter <cl@...ux-foundation.org> CC: Martin Bligh <mbligh@...gle.com>, MinChan Kim <minchan.kim@...il.com>, Jeremy Fitzhardinge <jeremy@...p.org>, Nick Piggin <nickpiggin@...oo.com.au>, Hugh Dickens <hugh@...itas.com>, Linux Memory Management List <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Avi Kivity <avi@...ranet.com>, Andrew Morton <akpm@...ux-foundation.org>, Rik van Riel <riel@...hat.com> Subject: Re: Populating multiple ptes at fault time Christoph Lameter wrote: > Martin Bligh wrote: >>> My patches were only for anonymous pages not for file backed because readahead >>> is available for file backed mappings. >> Do we populate the PTEs though? I didn't think that was batched, but I >> might well be wrong. > > We do not populate the PTEs and AFAICT PTE population was assumed not to be > performance critical since the backing media is comparatively slow. > Perhaps we should. In a virtual guest, the backing media is often an emulated IDE device, or something similarly inefficient, such that the bottleneck is the CPU. -- Chris -- 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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