From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932534AbbLGORB (ORCPT ); Mon, 7 Dec 2015 09:17:01 -0500 Received: from mx1.redhat.com ([209.132.183.28]:40754 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932083AbbLGOQ7 (ORCPT ); Mon, 7 Dec 2015 09:16:59 -0500 Date: Mon, 7 Dec 2015 15:16:55 +0100 From: Jiri Olsa To: Martin =?utf-8?B?TGnFoWth?= Cc: Jiri Olsa , Arnaldo Carvalho de Melo , lkml , David Ahern , Ingo Molnar , Namhyung Kim , Peter Zijlstra Subject: Re: [RFC] The -Og debugging experience Message-ID: <20151207141655.GA10910@krava.brq.redhat.com> References: <20151202164827.GA21124@krava.brq.redhat.com> <566563E7.9040706@suse.cz> <20151207134542.GB26191@krava.brq.redhat.com> <566591EB.5080404@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <566591EB.5080404@suse.cz> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 07, 2015 at 03:04:27PM +0100, Martin Liška wrote: SNIP > Hi. > > Unfortunately, running 'perf report' for a medium-size report is very fast a not if you use TUI ;-) > killing the process from other terminal produces: > > [Current thread is 1 (Thread 0x7ffff7fc5740 (LWP 7429))] > (gdb) bt > #0 0x00007ffff632d230 in __write_nocancel () from /lib64/libc.so.6 > #1 0x00007ffff62c4dff in _IO_new_file_write () from /lib64/libc.so.6 > #2 0x00007ffff62c4403 in new_do_write () from /lib64/libc.so.6 > #3 0x00007ffff62c5d09 in __GI__IO_do_write () from /lib64/libc.so.6 > #4 0x00007ffff62c5417 in __GI__IO_file_xsputn () from /lib64/libc.so.6 > #5 0x00007ffff6299cdb in vfprintf () from /lib64/libc.so.6 > #6 0x00007ffff62a03f7 in fprintf () from /lib64/libc.so.6 > #7 0x00000000004ef12c in hist_entry__fprintf (he=he@entry=0x1c62b30, size=, size@entry=0, hists=hists@entry=0x1813818, ^^^^^^^^^^^^^^ > bf=bf@entry=0x1d5cd40 " 0.08% cc1plus cc1plus", ' ' , "[.] _Z25number_of_iterations_exitP4loopP8edge_defP15tree_niter_descbb", ' ' ..., bfsz=bfsz@entry=479, fp=fp@entry=0x7ffff65f0640 <_IO_2_1_stdout_>) > at ui/stdio/hist.c:427 > #8 0x00000000004ef549 in hists__fprintf (hists=hists@entry=0x1813818, show_header=show_header@entry=true, max_rows=max_rows@entry=0, max_cols=max_cols@entry=0, min_pcnt=0, fp=0x7ffff65f0640 <_IO_2_1_stdout_>) at ui/stdio/hist.c:534 > #9 0x000000000042d6a3 in perf_evlist__tty_browse_hists (evlist=0x1812c90, rep=rep@entry=0x7fffffffc6e0, help=help@entry=0x515948 "For a higher level overview, try: perf report --sort comm,dso") at builtin-report.c:370 > #10 0x000000000042d7d2 in report__browse_hists (rep=rep@entry=0x7fffffffc6e0) at builtin-report.c:455 > #11 0x000000000042d992 in __cmd_report (rep=rep@entry=0x7fffffffc6e0) at builtin-report.c:571 > #12 0x000000000042ec1f in cmd_report (argc=0, argv=0x7fffffffde00, prefix=) at builtin-report.c:957 ^^^^^^^^^^^^^^ > #13 0x000000000046c496 in run_builtin (p=p@entry=0x7771a0 , argc=argc@entry=1, argv=argv@entry=0x7fffffffde00) at perf.c:387 > #14 0x000000000046c693 in handle_internal_command (argc=1, argv=0x7fffffffde00) at perf.c:448 > #15 0x000000000046c6fe in run_argv (argcp=argcp@entry=0x7fffffffdc6c, argv=argv@entry=0x7fffffffdc60) at perf.c:492 > #16 0x000000000046c94c in main (argc=1, argv=0x7fffffffde00) at perf.c:609 > > Which is fine. marked 2 instances of 'optimized out' cases above in your output > > I've been using GCC 5.2. What version are you using? 5.1.1 > I've also tried to run './perf test' and terminate the process at random places, but the back trace was OK. > > I would appreciate if you send me a patch that causes a segfault that is wrongly displayed. if you run TUI, you dont need to be fast ;-) make sure you compile with slang devel pkg thanks. jirka