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SubjectRe: [PATCH v5 10/10] perf probe: Support SDT markers having reference counter (semaphore)
* Ravi Bangoria <ravi.bangoria@linux.ibm.com> [2018-06-28 10:52:09]:

> With this, perf buildid-cache will save SDT markers with reference
> counter in probe cache. Perf probe will be able to probe markers
> having reference counter. Ex,
>
> # readelf -n /tmp/tick | grep -A1 loop2
> Name: loop2
> ... Semaphore: 0x0000000010020036
>
> # ./perf buildid-cache --add /tmp/tick

Would this perf buildid-cache work if the executable is stripped of
symbols?

> # ./perf probe sdt_tick:loop2
> # ./perf stat -e sdt_tick:loop2 /tmp/tick
> hi: 0
> hi: 1
> hi: 2
> ^C
> Performance counter stats for '/tmp/tick':
> 3 sdt_tick:loop2
> 2.561851452 seconds time elapsed

Also can we document how to use SDT markers with perf under perf-probe
or perf-build-cache?

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