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[Docs][llvm-exegesis] Add documentation on validation counters option (#82132)

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This patch documents the --validation-counter flag.
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Aiden Grossman 2024-02-19 01:39:01 -08:00 committed by GitHub
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llvm/docs/CommandGuide/llvm-exegesis.rst
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@ -443,6 +443,17 @@ OPTIONS
when performing latency measurements. By default, llvm-exegesis will repeat
a latency measurement enough times to balance run-time and noise reduction.
.. option:: --validation-counter=[instructions-retired,l1d-cache-load-misses,
l1d-cache-store-misses,l1i-cache-load-misses,data-tlb-load-misses,
data-tld-store-misses,instruction-tlb-load-misses]
This option enables the use of validation counters, which measure additional
microarchitectural events like cache misses to validate snippet execution
conditions. These events are measured using the perf subsystem in a group
with the performance counter used to measure the value of interest. This
flag can be specified multiple times to measure multiple events. The maximum
number of validation counters is platform dependent.
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