linux-kernel - Re: [PATCHSET 00/17] perf tools: Introduce new 'ftrace' command (v4)

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Message-ID: <20130809102306.GA1045@krava.brq.redhat.com>
Date:	Fri, 9 Aug 2013 12:23:06 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Jeremy Eder <jeder@...hat.com>
Subject: Re: [PATCHSET 00/17] perf tools: Introduce new 'ftrace' command (v4)

On Tue, Jul 30, 2013 at 06:18:57PM +0900, Namhyung Kim wrote:
> This patchset implements a front-end tool for kernel's ftrace.  It
> uses function_graph tracer by default and normal function tracer is
> also supported.  (Of course you need to enable those tracers in your
> kernel first.)
> 
> v4 changes:
>  * use pid instead of tid for -p option (David)
>  * not to poll() for reading ftrace pipes (Jiri)
>  * rename to create_perf_header() (Jiri)
>  * canonicalize directory name (Jiri)
>  * show more info when -D option was given (Jiri)
>  * update documentation (Jiri)
>  * and few more bug fixes
> 
> I pushed it out to 'perf/ftrace-v4' branch on my tree at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git

got following for record:

[root@...p-26-214 perf]# ./perf ftrace record kill
usage: kill [ -s signal | -p ] [ -a ] pid ...
       kill -l [ signal ]
recorder failed for some reason on cpu0
recorder failed for some reason on cpu1


afterwards 'perf ftrace report' gets stuck with 2 processes:

[jolsa@...p-26-214 perf]$ sudo pstack 1470
#0  0x00007f23ab61e997 in munmap () from /lib64/libc.so.6
#1  0x000000000047b5f7 in __perf_session__process_events ()
#2  0x000000000043f230 in do_ftrace_report ()
#3  0x0000000000440555 in cmd_ftrace ()
#4  0x000000000041aad3 in run_builtin ()
#5  0x000000000041a379 in main ()
[jolsa@...p-26-214 perf]$ sudo pstack 1471
#0  0x00007f23ab61b623 in __select_nocancel () from /lib64/libc.so.6
#1  0x000000000046a337 in pager_preexec ()
#2  0x000000000045f5a3 in start_command ()
#3  0x000000000046a4ab in setup_pager ()
#4  0x0000000000440535 in cmd_ftrace ()
#5  0x000000000041aad3 in run_builtin ()
#6  0x000000000041a379 in main ()


jirka
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