c98da372cb
This change adds the support to compute and report the staleness metrics after stale profile matching so that we can know how effective the fuzzy matching is, i. e. how many callsites and samples are recovered by the matching. Some implementation notes: - The function checksum mismatch metrics are not applicable here as it's function-level metrics, checksum mismatch remains the same before and after matching, so we need to compute based on the callsite samples. - Added two new counters `NumRecoveredCallsites`, `RecoveredCallsiteSamples` for this and removed `TotalCallsiteSamples` as now the we can use the `TotalFuncHashSamples` as base, and renamed some counters. - In profile matching, we changed to use a state machine to represent the callsite's matching state changes. See the `MatchState` for the state, and used a new function `recordCallsiteMatchStates` to compute and record the callsite's match states changes before and after the matching, , the result is compressed and saved into a `FuncCallsiteMatchStates` map for later counting use. - Changed the counting function to run on module-level and moved it to the end of the whole process(`computeAndReportProfileStaleness`). The reason is before the callsite is only counted on top-level function, this change extends it to count(recursively) on the inlined functions and samples, which is more accurate.
11 lines
1.0 KiB
LLVM
11 lines
1.0 KiB
LLVM
; REQUIRES: x86_64-linux
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; RUN: opt < %S/pseudo-probe-stale-profile-matching-lto.ll -passes='thinlto<O2>' -pgo-kind=pgo-sample-use-pipeline -sample-profile-file=%S/Inputs/pseudo-probe-stale-profile-matching-lto.prof -report-profile-staleness -persist-profile-staleness -S 2>%t -o %t.ll
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; RUN: FileCheck %s --input-file %t
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; RUN: FileCheck %s --input-file %t.ll -check-prefix=CHECK-MD
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; CHECK: (1/1) of functions' profile are invalid and (6822/6822) of samples are discarded due to function hash mismatch.
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; CHECK: (4/4) of callsites' profile are invalid and (5026/6822) of samples are discarded due to callsite location mismatch.
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; CHECK: (4/4) of callsites and (5026/5026) of samples are recovered by stale profile matching.
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; CHECK-MD: ![[#]] = !{!"NumStaleProfileFunc", i64 1, !"TotalProfiledFunc", i64 1, !"MismatchedFunctionSamples", i64 6822, !"TotalFunctionSamples", i64 6822, !"NumMismatchedCallsites", i64 0, !"NumRecoveredCallsites", i64 4, !"TotalProfiledCallsites", i64 4, !"MismatchedCallsiteSamples", i64 0, !"RecoveredCallsiteSamples", i64 5026}
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