Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755397Ab1DFMPQ (ORCPT ); Wed, 6 Apr 2011 08:15:16 -0400 Received: from mail-qy0-f181.google.com ([209.85.216.181]:52986 "EHLO mail-qy0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752339Ab1DFMPO (ORCPT ); Wed, 6 Apr 2011 08:15:14 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=lBkeysUrZzn9QyHpjtU8WQIrHMyhMAB9UisdWodi5lx0kkG0eHTlN627hZu4kHhWZ2 NNb3Xml8KuOQ+/49xKQCzIgo8RiXTCxQAFY5EaxGEx71Aas3K3KqyrWPEsx8etfEHcNz ErYaHLoX+brAKIwmEZYKxbGINUw0fEdRVa2g4= Date: Wed, 6 Apr 2011 14:15:07 +0200 From: Frederic Weisbecker To: David Ahern Cc: Akihiro Nagai , Arnaldo Carvalho de Melo , Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, Masami Hiramatsu , 2nddept-manager@sdl.hitachi.co.jp, Paul Mackerras Subject: Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command Message-ID: <20110406121501.GA1867@nowhere> References: <20110324113137.20235.42265.stgit@localhost6.localdomain6> <20110324113209.20235.61900.stgit@localhost6.localdomain6> <4D8B79E6.2050603@gmail.com> <4D8C6B1B.70409@hitachi.com> <4D8CAE74.9080805@gmail.com> <4D906450.1040809@hitachi.com> <4D909BBB.5020500@gmail.com> <20110401151313.GC2335@nowhere> <4D96072E.4060902@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D96072E.4060902@gmail.com> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2907 Lines: 68 On Fri, Apr 01, 2011 at 11:11:10AM -0600, David Ahern wrote: > > > On 04/01/11 09:13, Frederic Weisbecker wrote: > > On Mon, Mar 28, 2011 at 08:31:23AM -0600, David Ahern wrote: > >> On 03/28/11 04:34, Akihiro Nagai wrote: > >>>> from is sample->ip? to is sample->addr? In the above example > >>>> 0x39d3015260 is the value from sample->addr, 1526f is sample->ip which > >>>> resolves to _dl_next_ld_env_entry from /lib64/ld-2.13.so. > >>> Yes. > >>> In this example, resolved address is only sample->ip (branch from). > >>> We need the resolved address of sample->addr (branch to) too, because > >>> both of them are addresses of execution code. > >> > >> Ok, now I understand. In that case add conversion of sample->addr to > >> symbols to perf-script. > > > > I agree that we should rather use perf script for branch dumps. > > Sorry Akihiro, I think we suggested you to create this dedicated > > perf branch by the past. But then perf script became the vanilla dump > > tool in the middle and it seems more suitable today. > > > > We can still create a perf branch later in order to produce some more > > advanced post-processing tools. But for sample dumps perf script (which starts > > to show itself as a misnomer BTW) seems to be the right place. > > perf-dump? Yeah. We could make it an alias of perf-script. > > > > So, in this context, if we have PERF_SAMPLE_ADDR, we are going to always > > follow the ip with a "=>" and then resolve the address, etc... > > > > Yeah it makes sense for this default mode. But what about when we'll want > > a function graph kind of output? This will require a totally different > > layout. Also PERF_SAMPLE_ADDR may be used for different context in the > > future. > > > > Perhaps we want a kind of per evsel callback that makes its own > > interpretation of the pid/tid/dso/sym/etc... options asked by the > > user? > > The print addr function can take the evsel as an input. It includes the > event type which can be used to decide what the address means. Also yeah. But once we'll have the graph output, that may become a real mess. > > > > > But well, we can start simple and make and just do the => trick > > if we have PERF_SAMPLE_ADDR and resolve addr if the user asked > > the sym. Then when we have the graph output, have these per evsel > > display callbacks. > > There is another email thread about page faults. The user wants sample > address resolved to symbols. I was going to look into it next week when > I get back from vacation. What we seem to need for that is to bring a pagefault tracepoint. We had propositions for that in the past, but work on this is in pause mode it seems. -- 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/