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perf Documentation: Add tip for hybrid event merging

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Add informative text outlining the IPC imbalances associated with
merging cross-hybrid core events like cycles.

Signed-off-by: Ian Rogers <irogers@google.com>
Assisted-by: Antigravity:gemini-3.1-pro
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Ian Rogers 2026-09-16 22:07:03 -07:00 committed by Arnaldo Carvalho de Melo
parent 6fa291f805
commit aa2bad59fd
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tools/perf/Documentation/tips.txt
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@ -66,3 +66,4 @@ For latency profiling, try: perf record/report --latency
For parallelism histogram, try: perf report --hierarchy --sort latency,parallelism,comm,symbol
To analyze particular parallelism levels, try: perf report --latency --parallelism=32-64
To see how parallelism changes over time, try: perf report -F time,latency,parallelism --time-quantum=1s
When merging events like cycles, different core frequencies and instructions per cycle mean the counts may not fairly reflect time spent in a function.