linux-kernel - Re: [PATCH v5 3/6] perf record: Force enable --timestamp-filename when --switch-output is provided

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Date:	Wed, 20 Apr 2016 16:21:17 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	<acme@...nel.org>, <linux-kernel@...r.kernel.org>,
	<pi3orama@....com>, Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>, He Kuang <hekuang@...wei.com>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>
Subject: Re: [PATCH v5 3/6] perf record: Force enable --timestamp-filename
 when --switch-output is provided



On 2016/4/20 15:59, Jiri Olsa wrote:
> On Mon, Apr 18, 2016 at 02:55:29PM +0000, Wang Nan wrote:
>> Without this patch, the last output doesn't have timestamp appended if
>> --timestamp-filename is not explicitly provided. For example:
>>
>>    # perf record -a --switch-output &
>>    [1] 11224
>>    # kill -s SIGUSR2 11224
>>    [ perf record: dump data: Woken up 1 times ]
>>    # [ perf record: Dump perf.data.2015122622372823 ]
>>
>>    # fg
>>    perf record -a --switch-output
>>    ^C[ perf record: Woken up 1 times to write data ]
>>    [ perf record: Captured and wrote 0.027 MB perf.data (540 samples) ]
>>
>>    # ls -l
>>    total 836
>>    -rw------- 1 root root  33256 Dec 26 22:37 perf.data   <---- *Odd*
>>    -rw------- 1 root root 817156 Dec 26 22:37 perf.data.2015122622372823
> I'm getting this:
>
> [root@...va perf]# ./perf record -a --switch-output &
> [root@...va perf]# kill -s SIGUSR2 18974
> [ perf record: dump data: Woken up 4 times ]
> [ perf record: Dump perf.data.2016042009574314 ]
>
> [root@...va perf]# ./perf report -i perf.data.2016042009574314
> perf: Segmentation fault
> -------- backtrace --------
> ./perf[0x552b0b]
> /lib64/libc.so.6(+0x34a50)[0x7f711b434a50]
> /lib64/libc.so.6(strlen+0x2a)[0x7f711b48b33a]
> ./perf(perf_hpp__reset_sort_width+0x4f)[0x4e9b1f]
> ./perf[0x54b113]
> ./perf(perf_evlist__tui_browse_hists+0x91)[0x551361]
> ./perf(cmd_report+0x1a34)[0x434b44]
> ./perf[0x485681]
> ./perf(main+0x672)[0x424382]
> /lib64/libc.so.6(__libc_start_main+0xf0)[0x7f711b420700]
> ./perf(_start+0x29)[0x4244a9]
> [0x0]

Can't reproduce... Can you get reproduce problem without this patch (3/6)?

My local tree is based on newest perf/core (commit ccd62a8 "perf trace:
Fix build when DWARF unwind isn't available"). Could you please check your
source?

Thank you.

>
> thanks,
> jirka