From: Yang Jihong yangjihong1@huawei.com
[ Upstream commit 02f9b50e04812782fd006ed21c6da1c5e3e373da ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/builtin-record.c | 5 +++++ tools/perf/util/data.c | 2 -- 2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index b7f8c94d052d0..5d86aa5ff5367 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -2449,6 +2449,11 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) if (data->is_pipe && rec->evlist->core.nr_entries == 1) rec->opts.sample_id = true;
+ if (rec->timestamp_filename && perf_data__is_pipe(data)) { + rec->timestamp_filename = false; + pr_warning("WARNING: --timestamp-filename option is not available in pipe mode.\n"); + } + evlist__uniquify_name(rec->evlist);
/* Debug message used by test scripts */ diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c index c29d8a382b196..550675ce0b787 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;