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 09:59:45 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.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 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]


thanks,
jirka