Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754578Ab2KMI00 (ORCPT ); Tue, 13 Nov 2012 03:26:26 -0500 Received: from e28smtp03.in.ibm.com ([122.248.162.3]:58535 "EHLO e28smtp03.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752126Ab2KMI0X (ORCPT ); Tue, 13 Nov 2012 03:26:23 -0500 Message-ID: <50A20428.1030004@linux.vnet.ibm.com> Date: Tue, 13 Nov 2012 16:26:16 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 MIME-Version: 1.0 To: Marcelo Tosatti CC: Avi Kivity , LKML , KVM Subject: Re: [PATCH] KVM: MMU: lazily drop large spte References: <50978DFE.1000005@linux.vnet.ibm.com> <20121112231032.GB5798@amt.cnet> In-Reply-To: <20121112231032.GB5798@amt.cnet> Content-Type: multipart/mixed; boundary="------------040203090405020601040802" x-cbid: 12111308-3864-0000-0000-00000584B77D Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13349 Lines: 210 This is a multi-part message in MIME format. --------------040203090405020601040802 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Marcelo, On 11/13/2012 07:10 AM, Marcelo Tosatti wrote: > On Mon, Nov 05, 2012 at 05:59:26PM +0800, Xiao Guangrong wrote: >> Do not drop large spte until it can be insteaded by small pages so that >> the guest can happliy read memory through it >> >> The idea is from Avi: >> | As I mentioned before, write-protecting a large spte is a good idea, >> | since it moves some work from protect-time to fault-time, so it reduces >> | jitter. This removes the need for the return value. >> >> Signed-off-by: Xiao Guangrong >> --- >> arch/x86/kvm/mmu.c | 34 +++++++++------------------------- >> 1 files changed, 9 insertions(+), 25 deletions(-) > > Its likely that other 4k pages are mapped read-write in the 2mb range > covered by a read-only 2mb map. Therefore its not entirely useful to > map read-only. > It needs a page fault to install a pte even if it is the read access. After the change, the page fault can be avoided. > Can you measure an improvement with this change? I have a test case to measure the read time which has been attached. It maps 4k pages at first (dirt-loggged), then switch to large sptes (stop dirt-logging), at the last, measure the read access time after write protect sptes. 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