From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id 7632E6B006A for ; Sun, 10 Oct 2010 03:35:44 -0400 (EDT) Date: Sun, 10 Oct 2010 09:35:29 +0200 From: Gleb Natapov Subject: Re: [PATCH v6 03/12] Retry fault before vmentry Message-ID: <20101010073529.GL2397@redhat.com> References: <1286207794-16120-1-git-send-email-gleb@redhat.com> <1286207794-16120-4-git-send-email-gleb@redhat.com> <4CADBD13.4040609@redhat.com> <20101007172152.GB2397@redhat.com> <4CB0B778.6060005@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4CB0B778.6060005@redhat.com> Sender: owner-linux-mm@kvack.org To: Avi Kivity Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, mingo@elte.hu, a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com, riel@redhat.com, cl@linux-foundation.org, mtosatti@redhat.com List-ID: On Sat, Oct 09, 2010 at 08:42:00PM +0200, Avi Kivity wrote: > On 10/07/2010 07:21 PM, Gleb Natapov wrote: > >On Thu, Oct 07, 2010 at 02:29:07PM +0200, Avi Kivity wrote: > >> On 10/04/2010 05:56 PM, Gleb Natapov wrote: > >> >When page is swapped in it is mapped into guest memory only after guest > >> >tries to access it again and generate another fault. To save this fault > >> >we can map it immediately since we know that guest is going to access > >> >the page. Do it only when tdp is enabled for now. Shadow paging case is > >> >more complicated. CR[034] and EFER registers should be switched before > >> >doing mapping and then switched back. > >> > >> With non-pv apf, I don't think we can do shadow paging. The guest > >Yes, with non-pv this trick will not work without tdp. I haven't even > >considered it for that case. > > > > What about nnpt? The same issues exist. > I am not sure how nntp works. What is the problem there? In case of tdp prefault instantiates page in direct_map, how nntp interfere with that? -- Gleb. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org