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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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10
src/runtime/metrics/description.go
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@ -91,6 +91,16 @@ var allDesc = []Description{
Description: "Number of objects, live or unswept, occupying heap memory.",
Kind: KindUint64,
},
{
Name: "/gc/heap/tiny/allocs:objects",
Description: "Count of small allocations that are packed together into blocks. " +
"These allocations are counted separately from other allocations " +
"because each individual allocation is not tracked by the runtime, " +
"only their block. Each block is already accounted for in " +
"allocs-by-size and frees-by-size.",
Kind: KindUint64,
Cumulative: true,
},
{
Name: "/gc/pauses:seconds",
Description: "Distribution individual GC-related stop-the-world pause latencies.",