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| author | Michael Petlan <mpetlan@redhat.com> | 2024-09-27 17:19:26 +0200 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2024-10-02 15:29:25 -0700 |
| commit | d29d92df410e2fb523f640478b18f70c1823e55e (patch) | |
| tree | a0a16cc1d3c2e123c15a566b54ad2d2307adb27a /tools/perf/builtin-trace.c | |
| parent | 5873de90315a13d211b1d50a1ba97f21a6f17516 (diff) | |
| download | lwn-d29d92df410e2fb523f640478b18f70c1823e55e.tar.gz lwn-d29d92df410e2fb523f640478b18f70c1823e55e.zip | |
perf trace: Keep exited threads for summary
Since 9ffa6c7512ca ("perf machine thread: Remove exited threads by
default") perf cleans exited threads up, but as said, sometimes they
are necessary to be kept. The mentioned commit does not cover all the
cases, we also need the information to construct the summary table in
perf-trace.
Before:
# perf trace -s true
Summary of events:
After:
# perf trace -s -- true
Summary of events:
true (383382), 64 events, 91.4%
syscall calls errors total min avg max stddev
(msec) (msec) (msec) (msec) (%)
--------------- -------- ------ -------- --------- --------- --------- ------
mmap 8 0 0.150 0.013 0.019 0.031 11.90%
mprotect 3 0 0.045 0.014 0.015 0.017 6.47%
openat 2 0 0.014 0.006 0.007 0.007 9.73%
munmap 1 0 0.009 0.009 0.009 0.009 0.00%
access 1 1 0.009 0.009 0.009 0.009 0.00%
pread64 4 0 0.006 0.001 0.001 0.002 4.53%
fstat 2 0 0.005 0.001 0.002 0.003 37.59%
arch_prctl 2 1 0.003 0.001 0.002 0.002 25.91%
read 1 0 0.003 0.003 0.003 0.003 0.00%
close 2 0 0.003 0.001 0.001 0.001 3.86%
brk 1 0 0.002 0.002 0.002 0.002 0.00%
rseq 1 0 0.001 0.001 0.001 0.001 0.00%
prlimit64 1 0 0.001 0.001 0.001 0.001 0.00%
set_robust_list 1 0 0.001 0.001 0.001 0.001 0.00%
set_tid_address 1 0 0.001 0.001 0.001 0.001 0.00%
execve 1 0 0.000 0.000 0.000 0.000 0.00%
[namhyung: simplified the condition]
Fixes: 9ffa6c7512ca ("perf machine thread: Remove exited threads by default")
Reported-by: Veronika Molnarova <vmolnaro@redhat.com>
Signed-off-by: Michael Petlan <mpetlan@redhat.com>
Link: https://lore.kernel.org/r/20240927151926.399474-1-mpetlan@redhat.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/builtin-trace.c')
| -rw-r--r-- | tools/perf/builtin-trace.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index f6e847529073..0b30297b4ecb 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -5449,6 +5449,10 @@ init_augmented_syscall_tp: if (trace.summary_only) trace.summary = trace.summary_only; + /* Keep exited threads, otherwise information might be lost for summary */ + if (trace.summary) + symbol_conf.keep_exited_threads = true; + if (output_name != NULL) { err = trace__open_output(&trace, output_name); if (err < 0) { |