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author | Yang Jihong <yangjihong1@huawei.com> | 2024-01-19 07:03:03 +0300 |
---|---|---|
committer | Namhyung Kim <namhyung@kernel.org> | 2024-01-22 23:08:20 +0300 |
commit | 02f9b50e04812782fd006ed21c6da1c5e3e373da (patch) | |
tree | 55acd9ecd0f741435a79819160a7af18537f4eff /tools/perf/util/data.c | |
parent | aff10a165201f6f60cff225083ce301ad3f5d8f1 (diff) | |
download | linux-02f9b50e04812782fd006ed21c6da1c5e3e373da.tar.xz |
perf record: Check conflict between '--timestamp-filename' option and pipe mode before recording
In pipe mode, no need to switch perf data output, therefore,
'--timestamp-filename' option should not take effect.
Check the conflict before recording and output WARNING.
In this case, the check pipe mode in perf_data__switch() can be removed.
Before:
# perf record --timestamp-filename -o- perf test -w noploop | perf report -i- --percent-limit=1
# To display the perf.data header info, please use --header/--header-only options.
#
[ perf record: Woken up 1 times to write data ]
[ perf record: Dump -.2024011812110182 ]
#
# Total Lost Samples: 0
#
# Samples: 4K of event 'cycles:P'
# Event count (approx.): 2176784359
#
# Overhead Command Shared Object Symbol
# ........ ....... .................... ......................................
#
97.83% perf perf [.] noploop
#
# (Tip: Print event counts in CSV format with: perf stat -x,)
#
After:
# perf record --timestamp-filename -o- perf test -w noploop | perf report -i- --percent-limit=1
WARNING: --timestamp-filename option is not available in pipe mode.
# To display the perf.data header info, please use --header/--header-only options.
#
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.000 MB - ]
#
# Total Lost Samples: 0
#
# Samples: 4K of event 'cycles:P'
# Event count (approx.): 2185575421
#
# Overhead Command Shared Object Symbol
# ........ ....... ..................... .............................................
#
97.75% perf perf [.] noploop
#
# (Tip: Profiling branch (mis)predictions with: perf record -b / perf report)
#
Fixes: ecfd7a9c044e ("perf record: Add '--timestamp-filename' option to append timestamp to output file name")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240119040304.3708522-3-yangjihong1@huawei.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/util/data.c')
-rw-r--r-- | tools/perf/util/data.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c index c29d8a382b19..550675ce0b78 100644 --- a/tools/perf/util/data.c +++ b/tools/perf/util/data.c @@ -430,8 +430,6 @@ int perf_data__switch(struct perf_data *data, { int ret; - if (check_pipe(data)) - return -EINVAL; if (perf_data__is_read(data)) return -EINVAL; |