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SubjectRe: [PATCHSET 0/5] perf tools: Show per-event lost sample count (v2)
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On 1/09/22 22:57, Namhyung Kim wrote:
> 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.
>
> Changes in v2)
> * fix id_hdr_size calculation (Adrian)
> * fix a memory leak
> * display lost samples even if no samples
>
>
> 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-v2' 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

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>

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