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| author | Than McIntosh <thanm@google.com> | 2023-07-24 10:58:26 -0400 |
|---|---|---|
| committer | Than McIntosh <thanm@google.com> | 2023-09-15 12:45:14 +0000 |
| commit | dab9c502c4192d90b6cef6c9e54dc98f2aee932f (patch) | |
| tree | aacfea6a741570e837ecf68e6e76a67b8d79d504 /src/cmd/compile/internal/base/debug.go | |
| parent | a278550c40ef3f01a5fcbef43414dc49009201f8 (diff) | |
| download | go-dab9c502c4192d90b6cef6c9e54dc98f2aee932f.tar.xz | |
cmd/compile/internal/inline: add callsite trace output debugging flag
Add a new debug flag "-d=dumpinlcallsitescores" that dumps out a
summary of all callsites in the package being compiled with info on
inlining heuristics, for human consumption. Sample output lines:
Score Adjustment Status Callee CallerPos ScoreFlags
...
115 40 DEMOTED cmd/compile/internal/abi.(*ABIParamAssignment).Offset expand_calls.go:1679:14|6 panicPathAdj
...
76 -5 PROMOTED runtime.persistentalloc mcheckmark.go:48:45|3 inLoopAdj
...
201 0 --- PGO unicode.DecodeRuneInString utf8.go:312:30|1
...
7 -5 --- PGO internal/abi.Name.DataChecked type.go:625:22|0 inLoopAdj
Here "Score" is the final score calculated for the callsite,
"Adjustment" is the amount added to or subtracted from the original
hairyness estimate to form the score. "Status" shows whether anything
changed with the site -- did the adjustment bump it down just below
the threshold ("PROMOTED") or instead bump it above the threshold
("DEMOTED") or did nothing happen as a result of the heuristics
("---"); "Status" also shows whether PGO was involved. "Callee" is the
name of the function called, "CallerPos" is the position of the
callsite, and "ScoreFlags" is a digest of the specific properties we
used to make adjustments to callsite score via heuristics.
Change-Id: Iea4b1cbfee038bc68df6ab81e9973f145636300b
Reviewed-on: https://go-review.googlesource.com/c/go/+/513455
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'src/cmd/compile/internal/base/debug.go')
| -rw-r--r-- | src/cmd/compile/internal/base/debug.go | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/base/debug.go b/src/cmd/compile/internal/base/debug.go index 21e8a31d1f..244ba1bc9d 100644 --- a/src/cmd/compile/internal/base/debug.go +++ b/src/cmd/compile/internal/base/debug.go @@ -22,6 +22,7 @@ type DebugFlags struct { Defer int `help:"print information about defer compilation"` DisableNil int `help:"disable nil checks" concurrent:"ok"` DumpInlFuncProps string `help:"dump function properties from inl heuristics to specified file"` + DumpInlCallSiteScores int `help:"dump scored callsites during inlining"` DumpPtrs int `help:"show Node pointers values in dump output"` DwarfInl int `help:"print information about DWARF inlined function creation"` EscapeMutationsCalls int `help:"print extra escape analysis diagnostics about mutations and calls" concurrent:"ok"` |