[PATCHSET 0/5] perf tools: Show per-event lost sample count (v1)

Namhyung Kim
2022-08-31T21:04:02Z

Hello,

Now we have PERF_FORMAT_LOST support, add it to perf record and report so that
it can show number of lost samples per event. This can be useful if you want
to reconstruct number of events from the samples like when using -c option.

Currently it adds PERF_RECORD_LOST_SAMPLES at the end of perf data after reading
event values by read(2). The perf record unconditionally sets the lost bit if
the kernel supports it. Users can see the number with `perf report --stat`.

You can get the code from 'perf/report-lost-v1' brach on

git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git

Thanks,
Namhyung

Namhyung Kim (5):
perf tools: Print LOST read format in the verbose mode
perf record: Set PERF_FORMAT_LOST by default
perf record: Read and inject LOST_SAMPLES events
perf hist: Add nr_lost_samples to hist_stats
perf report: Show per-event LOST SAMPLES stat

tools/perf/builtin-record.c | 60 +++++++++++++++++++++++
tools/perf/builtin-report.c | 17 +++++++
tools/perf/util/events_stats.h | 1 +
tools/perf/util/evsel.c | 10 +++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/hist.c | 8 +++
tools/perf/util/hist.h | 1 +
tools/perf/util/perf_event_attr_fprintf.c | 2 +-
8 files changed, 98 insertions(+), 2 deletions(-)

base-commit: 2f4c2fbd2ff5e3176b0121443f995808ee498bd0
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2.37.2.789.g6183377224-goog