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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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2
src/runtime/export_test.go
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@ -393,7 +393,7 @@ func ReadMemStatsSlow() (base, slow MemStats) {
bySize[i].Mallocs += uint64(m.smallFreeCount[i])
smallFree += uint64(m.smallFreeCount[i]) * uint64(class_to_size[i])
}
slow.Frees += memstats.tinyallocs + uint64(m.largeFreeCount)
slow.Frees += uint64(m.tinyAllocCount) + uint64(m.largeFreeCount)
slow.Mallocs += slow.Frees
slow.TotalAlloc = slow.Alloc + uint64(m.largeFree) + smallFree