Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762569Ab2FVPaM (ORCPT ); Fri, 22 Jun 2012 11:30:12 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:36582 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762556Ab2FVPaI (ORCPT ); Fri, 22 Jun 2012 11:30:08 -0400 Subject: Re: [RFC/PATCHSET 0/8] perf tools: Minimal build without libelf dependency (v2) From: Namhyung Kim To: David Ahern Cc: Peter Zijlstra , Arnaldo Carvalho de Melo , Paul Mackerras , Ingo Molnar , LKML , Jiri Olsa In-Reply-To: <4FE48CCA.2050506@gmail.com> References: <1340343462-15556-1-git-send-email-namhyung@kernel.org> <1340358478.18025.51.camel@twins> <1340377510.1478.10.camel@leonhard> <4FE48CCA.2050506@gmail.com> Content-Type: text/plain; charset="UTF-8" Date: Sat, 23 Jun 2012 00:30:00 +0900 Message-ID: <1340379000.1478.34.camel@leonhard> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1573 Lines: 40 2012-06-22 (금), 09:18 -0600, David Ahern: > On 6/22/12 9:05 AM, Namhyung Kim wrote: > > 2012-06-22 (금), 11:47 +0200, Peter Zijlstra: > >> On Fri, 2012-06-22 at 14:37 +0900, Namhyung Kim wrote: > >>> And then I realized that the perf record needs to know about the > >>> build-id's anyway. :( So I implemented a poor man's version of elf > >>> parser only for parsing the build-id info. > >> > >> Why? the very first versions didn't know about any of that nonsense :-) > >> It works just fine as long as you don't go change binaries around. > >> > >> That said, you did the work already, so no objection, just saying > >> builtids aren't that important. > > > > I'm not sure I understood you correctly. But 'perf record' needs to know > > about the build-id's to save them to perf.data for 'perf report' later. > > And 'perf archive' also needs to know about them to select necessary > > binaries for the session. > > > > And build-id's are not required for report (-B option for record). > > Also, the intent is for a small footprint binary for embedded systems. > On such a system I would expect binaries and libraries to be stripped, > so no point in running perf-archive. > But is there a chance that binaries on host still contains symbol (and debug) information even for those cases? -- Regards, Namhyung Kim -- 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/