Profiling with Linux perf tool
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Linux perf tool can be used to do non-intrusive profiling.
h2. Adding dynamic tracepoints
One can add tracepoints at function entry/exit (and other locations too):
sudo perf probe -x /path/to/ha_rocksdb.so --add rocksdb_prepare sudo perf probe -x /path/to/ha_rocksdb.so --add rocksdb_prepare%return
h2. Viewing the tracepoints
sudo perf probe -l
h2. Running the profiler
Something like:
perf record -e 'probe_ha_rocksdb:*' -a sleep 60
(TODO: -a means system-wide. There's also -p $PID option but one can't select it?)
h2. Examining the trace
perf script
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