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runtime/metrics: add tiny allocs metric

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Currently tiny allocations are not represented in either MemStats or
runtime/metrics, but they're represented in MemStats (indirectly) via
Mallocs. Add them to runtime/metrics by first merging
memstats.tinyallocs into consistentHeapStats (just for simplicity; it's
monotonic so metrics would still be self-consistent if we just read it
atomically) and then adding /gc/heap/tiny/allocs:objects to the list of
supported metrics.

Change-Id: Ie478006ab942a3e877b4a79065ffa43569722f3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/312909
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Michael Anthony Knyszek 2021-04-21 23:50:58 +00:00 • committed by Michael Knyszek
parent 7d22c2181b
commit 0b9ca4d907
7 changed files with 64 additions and 13 deletions
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7
src/runtime/metrics.go
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@ -124,6 +124,13 @@ func initMetrics() {
out.scalar = in.heapStats.numObjects
},
},
"/gc/heap/tiny/allocs:objects": {
deps: makeStatDepSet(heapStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindUint64
out.scalar = uint64(in.heapStats.tinyAllocCount)
},
},
"/gc/pauses:seconds": {
compute: func(_ *statAggregate, out *metricValue) {
hist := out.float64HistOrInit(timeHistBuckets)