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Message-ID: <4D90A236.9030200@ravellosystems.com> Date: Mon, 28 Mar 2011 16:59:02 +0200 From: Izik Eidus <izik.eidus@...ellosystems.com> To: nai.xia@...il.com CC: linux-kernel <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, Johannes Weiner <hannes@...xchg.org>, Chris Wright <chrisw@...s-sol.org>, Andrea Arcangeli <aarcange@...hat.com>, Rik van Riel <riel@...hat.com>, linux-mm <linux-mm@...ck.org> Subject: Re: [PATCH 0/2] ksm: take dirty bit as reference to avoid volatile pages On 03/28/2011 04:14 PM, Nai Xia wrote: > Currently, ksm uses page checksum to detect volatile pages. Izik Eidus > suggested that we could use pte dirty bit to optimize. This patch series > adds this new logic. > Hi, One small note: When kvm will use ksm on intel cpu with extended page tables support, the cpu won`t track dirty bit, therefore the calc_hash() logic should be used in such cases (untill intel will fadd this support in their cpus)... Moreover I think that even though that AMD nested page tables does update dirty bit, you still need to sync it with the host page table using mmu notifiers ? (Not that on regular application use case of ksm any of this should be an issue) -- 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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