diff options
| author |   Wang Nan <wangnan0@huawei.com> | 2016-04-20 18:59:51 +0000 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-04-28 09:58:59 -0300 |
| commit | eca857ab381858450ec2f91f5aaae7f2f7a7a180 (patch) | |
| tree | 84cfea69d6d0bc8af44ec420ab5c4afc804e479e /tools/perf/Documentation/perf-record.txt | |
| parent | perf record: Split output into multiple files via '--switch-output' (diff) | |
| download | linux-dev-eca857ab381858450ec2f91f5aaae7f2f7a7a180.tar.xz linux-dev-eca857ab381858450ec2f91f5aaae7f2f7a7a180.zip | |
perf record: Force enable --timestamp-filename when --switch-output is provided
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
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1461178794-40467-5-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
[ Updated man page, that also got an entry for --timestamp-filename ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-record.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index a77a431ca4ef..79a8a14f37b1 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -347,6 +347,9 @@ Configure all used events to run in kernel space. --all-user:: Configure all used events to run in user space. +--timestamp-filename +Append timestamp to output file name. + --switch-output:: Generate multiple perf.data files, timestamp prefixed, switching to a new one when receiving a SIGUSR2. @@ -355,6 +358,8 @@ A possible use case is to, given an external event, slice the perf.data file that gets then processed, possibly via a perf script, to decide if that particular perf.data snapshot should be kept or not. +Implies --timestamp-filename. + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] |