Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752270AbaBKHON (ORCPT ); Tue, 11 Feb 2014 02:14:13 -0500 Received: from merlin.infradead.org ([205.233.59.134]:45447 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750758AbaBKHOM (ORCPT ); Tue, 11 Feb 2014 02:14:12 -0500 Date: Tue, 11 Feb 2014 08:14:01 +0100 From: Peter Zijlstra To: Stephane Eranian Cc: Don Zickus , Arnaldo Carvalho de Melo , LKML , Jiri Olsa , Joe Mario , Richard Fowles Subject: Re: [PATCH 00/21] perf, c2c: Add new tool to analyze cacheline contention on NUMA systems Message-ID: <20140211071401.GG27965@twins.programming.kicks-ass.net> References: <1392053356-23024-1-git-send-email-dzickus@redhat.com> <20140210212955.GC5002@laptop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 10, 2014 at 11:21:53PM +0100, Stephane Eranian wrote: > On Mon, Feb 10, 2014 at 10:29 PM, Peter Zijlstra wrote: > > On Mon, Feb 10, 2014 at 12:28:55PM -0500, Don Zickus wrote: > >> The data output is verbose and there are lots of data tables that interprit the latencies > >> and data addresses in different ways to help see where bottlenecks might be lying. > > > > Would be good to see what the output looks like. > > > > What I haven't seen; and what I would find most useful; is using the IP > > + dwarf info to map it back to a data structure member. > > > > Since you're already using the PEBS data-source fields, you can also > > have a precise IP. For many cases its possible to reconstruct the exact > > data member the instruction is modifying. > > > The tool already uses precise=2 to get the precise IP. > > To get from IP to data member, you'd need some debug info which is not > yet emitted > by the compiler. That blows; how much is missing? -- 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/