From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: [PATCH 0/33] KVM: MMU: Cache shadow page tables Date: Thu, 4 Jan 2007 19:02:23 +0100 Message-ID: <20070104180223.GA11460@elte.hu> References: <459D21DD.5090506@qumranet.com> <20070104092226.91fa2dfe.akpm@osdl.org> <459D3C65.2090703@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Andrew Morton , kvm-devel , linux-kernel Return-path: To: Avi Kivity Content-Disposition: inline In-Reply-To: <459D3C65.2090703-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org * Avi Kivity wrote: > Andrew Morton wrote: > >Is this intended for 2.6.20, or would you prefer that we release what we > >have now and hold this off for 2.6.21? > > > > Even though these patches are potentially destabilazing, I'd like them > (and a few other patches) to go into 2.6.20: > > - kvm did not exist in 2.6.19, hence we cannot regress from that > - this patchset is the difference between a working proof of concept and > a generally usable system > - from my testing, it's quite stable seconded - i have tested the new MMU changes quite extensively and they are converging nicely. It brings down context-switch costs by a factor of 10 and more, even for microbenchmarks: instead of throwing away the full shadow pagetable hiearchy we have worked so hard to construct this patchset allows the intelligent caching of shadow pagetables. The effect is human-visible as well - the system got visibly snappier. (I'd increase the shadow cache pool from the current 256 pages to at least 1024 pages, but that's a detail.) Acked-by: Ingo Molnar Ingo ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV