From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757301Ab3GVKGM (ORCPT ); Mon, 22 Jul 2013 06:06:12 -0400 Received: from mail-ea0-f177.google.com ([209.85.215.177]:57204 "EHLO mail-ea0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752839Ab3GVKGK (ORCPT ); Mon, 22 Jul 2013 06:06:10 -0400 Date: Mon, 22 Jul 2013 12:06:06 +0200 From: Ingo Molnar To: Dave Hansen Cc: Raghavendra KT , linux-kernel@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Raghavendra KT Subject: Re: [RESEND][PATCH] mm: vmstats: tlb flush counters Message-ID: <20130722100605.GA1148@gmail.com> References: <20130716234438.C792C316@viggo.jf.intel.com> <51E95932.5030902@sr71.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <51E95932.5030902@sr71.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Dave Hansen wrote: > On 07/19/2013 04:38 AM, Raghavendra KT wrote: > > While measuring non - PLE performance, one of the bottleneck, I am seeing is > > flush tlbs. > > perf had helped in alaysing a bit there, but this patch would help > > in precise calculation. It will aslo help in tuning the PLE window > > experiments (larger PLE window > > would affect remote flush TLBs) > > Interesting. What workload is that? I've been having problems finding > workloads that are too consumed with TLB flushes. Btw., would be nice to also integrate these VM counters into perf as well, as an instrumentation variant/option. It could be done in an almost zero overhead fashion using jump-labels I think. [ Just in case someone is bored to death and is looking for an interesting side project ;-) ] Thanks, Ingo