perf probe: Support SDT markers having reference counter (semaphore)
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 # ./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 Link: http://lkml.kernel.org/r/20180820044250.11659-5-ravi.bangoria@linux.ibm.com Acked-by:Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by:
Masami Hiramatsu <mhiramat@kernel.org> Acked-by:
Srikar Dronamraju <srikar@linux.vnet.ibm.com> Reviewed-by:
Song Liu <songliubraving@fb.com> Tested-by:
Song Liu <songliubraving@fb.com> Signed-off-by:
Ravi Bangoria <ravi.bangoria@linux.ibm.com> Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org>
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ccea8727
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