Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752451AbbLIQ6M (ORCPT ); Wed, 9 Dec 2015 11:58:12 -0500 Received: from one.firstfloor.org ([193.170.194.197]:39279 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752180AbbLIQ6L (ORCPT ); Wed, 9 Dec 2015 11:58:11 -0500 Date: Wed, 9 Dec 2015 17:58:08 +0100 From: Andi Kleen To: Peter Zijlstra Cc: Jiri Olsa , Yunlong Song , dzickus@redhat.com, dsahern@gmail.com, fweisbec@gmail.com, jmario@redhat.com, efault@gmx.de, paulus@samba.org, rfowles@redhat.com, eranian@google.com, "acme@kernel.org >> Arnaldo Carvalho de Melo" , mingo@redhat.com, Linux Kernel Mailing List , Jiri Olsa , "wangnan0@huawei.com >> Wang Nan" , fowles@inreach.com, Namhyung Kim , andi@firstfloor.org Subject: Re: [Questions] perf c2c: What's the current status of perf c2c? Message-ID: <20151209165807.GP15533@two.firstfloor.org> References: <5667A8D4.4090601@huawei.com> <20151209080440.GA17211@krava.brq.redhat.com> <20151209093402.GM6356@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151209093402.GM6356@twins.programming.kicks-ass.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 Content-Length: 827 Lines: 22 > > the plan for me is to to use it some more to prove it's useful > > and kick it to be merged with perf at some point > > So I never really liked the c2c tool because it was so narrowly > focussed, it only works on NUMA thingies IIRC. It should work on all systems with an Intel Core (not Atom) However it was never clear to me if the tool was any better than simply sampling for mem_load_uops_l3_hit_retired.xsnp_hitm:pp (local socket) mem_load_uops_l3_miss_retired.remote_hitm:pp (remote socket) which gives you instructions that reference bouncing cache lines. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/