From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753590AbcHRHEy (ORCPT ); Thu, 18 Aug 2016 03:04:54 -0400 Received: from mail-wm0-f67.google.com ([74.125.82.67]:35720 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753487AbcHRHEw (ORCPT ); Thu, 18 Aug 2016 03:04:52 -0400 Subject: Re: [RFC PATCH 0/7] Add support for monitoring guest TLB operations To: Punit Agrawal References: <1471344312-26685-1-git-send-email-punit.agrawal@arm.com> <87fuq3tjmv.fsf@e105922-lin.cambridge.arm.com> <878tvvtir5.fsf@e105922-lin.cambridge.arm.com> Cc: kvm@vger.kernel.org, Marc Zyngier , Will Deacon , linux-kernel@vger.kernel.org, Steven Rostedt , Ingo Molnar , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org From: Paolo Bonzini Message-ID: <93b02f65-25cd-13b0-f5ef-6b286b328aad@redhat.com> Date: Thu, 18 Aug 2016 09:04:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <878tvvtir5.fsf@e105922-lin.cambridge.arm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/08/2016 19:20, Punit Agrawal wrote: > > > Having the ability to monitor the usage of guest TLB invalidations in > > > the host can be useful to diagnose performance issues on such systems. > > > > Are there hardware performance counters for these operations? > > That would have been ideal! There are PMU events defined for TLB > accesses and refills but unhelpfully none of them track maintenance > operations. I guess the patches do make sense then. :) Paolo