From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: Implement PEBS virtualization for Silvermont Date: Fri, 30 May 2014 09:39:34 +0200 Message-ID: <20140530073934.GC20167@laptop.programming.kicks-ass.net> References: <1401412327-14810-1-git-send-email-andi@firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: gleb@kernel.org, pbonzini@redhat.com, eranian@google.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org To: Andi Kleen Return-path: Content-Disposition: inline In-Reply-To: <1401412327-14810-1-git-send-email-andi@firstfloor.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On Thu, May 29, 2014 at 06:12:03PM -0700, Andi Kleen wrote: > PEBS is very useful (e.g. enabling the more cycles:pp event or > memory profiling) Unfortunately it didn't work in virtualization, > which is becoming more and more common. > > This patch kit implements simple PEBS virtualization for KVM on Silvermont > CPUs. Silvermont does not have the leak problems that prevented successfull > PEBS virtualization earlier. Silvermont is such an underpowered thing, who in his right mind would run anything virt on it to further reduce performance?