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runtime/metrics: clarify memory and GC metrics documentation

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Change-Id: I8940990a591a808ddd4b8613531f52453f85bde1
Reviewed-on: https://go-review.googlesource.com/c/go/+/271557
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
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Michael Anthony Knyszek 2020-11-19 15:01:34 +00:00 • committed by Michael Knyszek
parent 498d8d5371
commit add45938b5
2 changed files with 32 additions and 20 deletions
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23
src/runtime/metrics/doc.go
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@ -48,7 +48,7 @@ Supported metrics
Count of completed GC cycles generated by the Go runtime.
/gc/cycles/forced:gc-cycles
Count of completed forced GC cycles.
Count of completed GC cycles forced by the application.
/gc/cycles/total:gc-cycles
Count of all completed GC cycles.
@ -69,22 +69,29 @@ Supported metrics
Distribution individual GC-related stop-the-world pause latencies.
/memory/classes/heap/free:bytes
Memory that is available for allocation, and may be returned
to the underlying system.
Memory that is completely free and eligible to be returned to
the underlying system, but has not been. This metric is the
runtime's estimate of free address space that is backed by
physical memory.
/memory/classes/heap/objects:bytes
Memory occupied by live objects and dead objects that have
not yet been collected.
not yet been marked free by the garbage collector.
/memory/classes/heap/released:bytes
Memory that has been returned to the underlying system.
Memory that is completely free and has been returned to
the underlying system. This metric is the runtime's estimate of
free address space that is still mapped into the process, but
is not backed by physical memory.
/memory/classes/heap/stacks:bytes
Memory allocated from the heap that is occupied by stacks.
Memory allocated from the heap that is reserved for stack
space. Not all of it is necessarily simultaneously in use, but
it may not be used for any other purpose.
/memory/classes/heap/unused:bytes
Memory that is unavailable for allocation, but cannot be
returned to the underlying system.
Memory that is reserved for heap objects but is otherwise not
currently used to hold heap objects.
/memory/classes/metadata/mcache/free:bytes
Memory that is reserved for runtime mcache structures, but