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cmd/go/internal/work: add telemetry counters for build cache hits/misses

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The following counters are added in this cl
    go/buildcache/hit
    go/buildcache/miss
    go/buildcache/stdlibrecompiled (incremented at most once per
        invocation)

Change-Id: Ia78e136feac8226cb35e554503b672343cc30262
Reviewed-on: https://go-review.googlesource.com/c/go/+/587577
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
This commit is contained in:
Michael Matloob 2024-05-22 15:53:38 -04:00
parent 4cac885741
commit d8b92c2e2d
1 changed files with 25 additions and 1 deletions
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26
src/cmd/go/internal/work/buildid.go
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@ -10,6 +10,7 @@ import (
"os"
"os/exec"
"strings"
"sync"
"cmd/go/internal/base"
"cmd/go/internal/cache"
@ -18,6 +19,7 @@ import (
"cmd/go/internal/str"
"cmd/internal/buildid"
"cmd/internal/quoted"
"cmd/internal/telemetry"
)
// Build IDs
@ -403,6 +405,14 @@ func (b *Builder) fileHash(file string) string {
return buildid.HashToString(sum)
}
var (
counterCacheHit = telemetry.NewCounter("go/buildcache/hit")
counterCacheMiss = telemetry.NewCounter("go/buildcache/miss")
onceIncStdlibRecompiled sync.Once
stdlibRecompiled = telemetry.NewCounter("go/buildcache/stdlib-recompiled")
)
// useCache tries to satisfy the action a, which has action ID actionHash,
// by using a cached result from an earlier build. At the moment, the only
// cached result is the installed package or binary at target.
@ -416,7 +426,7 @@ func (b *Builder) fileHash(file string) string {
// during a's work. The caller should defer b.flushOutput(a), to make sure
// that flushOutput is eventually called regardless of whether the action
// succeeds. The flushOutput call must happen after updateBuildID.
func (b *Builder) useCache(a *Action, actionHash cache.ActionID, target string, printOutput bool) bool {
func (b *Builder) useCache(a *Action, actionHash cache.ActionID, target string, printOutput bool) (ok bool) {
// The second half of the build ID here is a placeholder for the content hash.
// It's important that the overall buildID be unlikely verging on impossible
// to appear in the output by chance, but that should be taken care of by
@ -448,6 +458,20 @@ func (b *Builder) useCache(a *Action, actionHash cache.ActionID, target string,
return false
}
defer func() {
// Increment counters for cache hits and misses based on the return value
// of this function. Don't increment counters if we return early because of
// cfg.BuildA above because we don't even look at the cache in that case.
if ok {
counterCacheHit.Inc()
} else {
if a.Package != nil && a.Package.Standard {
onceIncStdlibRecompiled.Do(stdlibRecompiled.Inc)
}
counterCacheMiss.Inc()
}
}()
c := cache.Default()
if target != "" {