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runtime,runtime/metrics: add metric to track scheduling latencies

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This change adds a metric to track scheduling latencies, defined as the
cumulative amount of time a goroutine spends being runnable before
running again. The metric is an approximations and samples instead of
trying to record every goroutine scheduling latency.

This change was primarily authored by mknyszek@google.com.

Change-Id: Ie0be7e6e7be421572eb2317d3dd8dd6f3d6aa152
Reviewed-on: https://go-review.googlesource.com/c/go/+/308933
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Michael Pratt 2020-08-07 16:28:35 +00:00
parent 105a6e9518
commit bedfeed54a
7 changed files with 81 additions and 1 deletions
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4
src/runtime/metrics/doc.go
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@ -139,5 +139,9 @@ Below is the full list of supported metrics, ordered lexicographically.
/sched/goroutines:goroutines
Count of live goroutines.
/sched/latencies:seconds
Distribution of the time goroutines have spent in the scheduler
in a runnable state before actually running.
*/
package metrics