Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754820AbaFJFBJ (ORCPT ); Tue, 10 Jun 2014 01:01:09 -0400 Received: from lgeamrelo02.lge.com ([156.147.1.126]:51012 "EHLO lgeamrelo02.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751225AbaFJFBH (ORCPT ); Tue, 10 Jun 2014 01:01:07 -0400 X-Original-SENDERIP: 10.177.220.181 X-Original-MAILFROM: namhyung@gmail.com From: Namhyung Kim To: Jiri Olsa Cc: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo , Corey Ashford , David Ahern , Frederic Weisbecker , Ingo Molnar , Jean Pihet , Paul Mackerras , Peter Zijlstra Subject: Re: [PATCHv4 00/13] perf tools: Speedup DWARF unwind References: <1401892622-30848-1-git-send-email-jolsa@kernel.org> Date: Tue, 10 Jun 2014 14:01:05 +0900 In-Reply-To: <1401892622-30848-1-git-send-email-jolsa@kernel.org> (Jiri Olsa's message of "Wed, 4 Jun 2014 16:36:49 +0200") Message-ID: <87wqcpbbou.fsf@sejong.aot.lge.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jiri, On Wed, 4 Jun 2014 16:36:49 +0200, Jiri Olsa wrote: > hi, > trying to speedup DWARF unwind report code by factoring > related code: > - caching sample's registers access > - keep dso data file descriptor open for the > life of the dso object > - replace dso cache code by mapping dso data file > directly for the life of the dso object > > The speedup is mainly for libunwind unwind. The libdw will benefit > mainly from cached registers access, because it handles dso data > accesses by itself.. and anyway it's still faster ;-). > > On ~11GB perf data file with dwarf unwind data I've got > around 30% speed up. > > I've also got possitive test feedback from Jean Pihet: > https://wiki.linaro.org/LEG/Engineering/TOOLS/perf-callstack-unwinding#Speed_improvement For the series, Acked-by: Namhyung Kim Thanks, Namhyung -- 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/