Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933875Ab2JZPbw (ORCPT ); Fri, 26 Oct 2012 11:31:52 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:64451 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933738Ab2JZPbu (ORCPT ); Fri, 26 Oct 2012 11:31:50 -0400 Subject: Re: [GIT PULL 0/9] perf/core improvements and fixes From: Namhyung Kim To: David Ahern Cc: Ingo Molnar , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, Andrew Vagin , Borislav Petkov , David Howells , Frederic Weisbecker , Jiri Olsa , Paul Mackerras , Peter Zijlstra , Stephane Eranian , Steven Rostedt , arnaldo.melo@gmail.com, Arnaldo Carvalho de Melo In-Reply-To: <508AA709.7010202@gmail.com> References: <1351261913-28250-1-git-send-email-acme@infradead.org> <20121026145451.GA14379@gmail.com> <508AA709.7010202@gmail.com> Content-Type: text/plain; charset="UTF-8" Date: Sat, 27 Oct 2012 00:31:42 +0900 Message-ID: <1351265502.1619.13.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: 1953 Lines: 63 2012-10-26 (금), 09:06 -0600, David Ahern: > On 10/26/12 8:54 AM, Ingo Molnar wrote: > >> perf/core improvements: > >> > >> . perf inject changes to allow showing where a task sleeps, from Andrew Vagin. > >> > >> . Makefile improvements from Namhyung Kim. > > > > These are really useful: there used to be a couple of seconds of > > wait time at the beginning of every perf build - these are now > > nicely explained with the various CHK entries. Kudos to Jiri who did the real work! > > PERF-VERSION-GEN and specifically the git commands are the cause of more > delay than the config checks, especially when doing the build in a VM > with the kernel source on an NFS mount. And I see a strange delay when compiling builtin-sched.o. After building perf tools, I deleted builtin-{sched,test,script}.o to rebuild the only since they are largest ones. namhyung@leonhard:perf$ ls -lS *.c | head -3 -rw-r--r-- 1 namhyung namhyung 45522 2012-10-27 00:20 builtin-sched.c -rw-r--r-- 1 namhyung namhyung 36372 2012-10-27 00:20 builtin-test.c -rw-r--r-- 1 namhyung namhyung 35555 2012-10-27 00:20 builtin-script.c namhyung@leonhard:perf$ rm builtin-{sched,test,script}.o And then building each file with time command shows this: namhyung@leonhard:perf$ time make builtin-script.o &> /dev/null real 0m4.577s user 0m2.755s sys 0m1.655s namhyung@leonhard:perf$ time make builtin-test.o &> /dev/null real 0m4.486s user 0m2.707s sys 0m1.658s namhyung@leonhard:perf$ time make builtin-sched.o &> /dev/null real 0m16.936s user 0m15.157s sys 0m1.635s You can see it easily when building perf without -j option. But I have no idea why it takes so long.. 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/