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perf tools: Move timestamp creation to util

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Timestamp generation becomes a public available helper. Which will
be used by 'perf record', help it output to split output file based
on time.

For example:

 perf.data.2015122620363710
 perf.data.2015122620364092
 perf.data.2015122620365423
 ...

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1453715801-7732-27-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-01-25 09:56:13 +00:00 • committed by Arnaldo Carvalho de Melo
parent 8fd34e1cce
commit 37b20151ef
3 changed files with 19 additions and 13 deletions
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17
tools/perf/util/util.c
View file

@ -701,3 +701,20 @@ bool is_regular_file(const char *file)
return S_ISREG(st.st_mode);
}
int fetch_current_timestamp(char *buf, size_t sz)
{
struct timeval tv;
struct tm tm;
char dt[32];
if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm))
return -1;
if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm))
return -1;
scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000);
return 0;
}