diff options
| author | Michael Pratt <mpratt@google.com> | 2020-08-07 16:28:35 +0000 |
|---|---|---|
| committer | Michael Pratt <mpratt@google.com> | 2021-04-23 13:48:10 +0000 |
| commit | bedfeed54a7a80123c07f83c325a0bcfe5c43398 (patch) | |
| tree | e3cd3332028b2bd64350701f5957b5cfbc0beb3d /src/runtime/histogram.go | |
| parent | 105a6e9518a5195950a2798769af6e86b6d87417 (diff) | |
| download | go-bedfeed54a7a80123c07f83c325a0bcfe5c43398.tar.gz go-bedfeed54a7a80123c07f83c325a0bcfe5c43398.zip | |
runtime,runtime/metrics: add metric to track scheduling latencies
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>
Diffstat (limited to 'src/runtime/histogram.go')
| -rw-r--r-- | src/runtime/histogram.go | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/runtime/histogram.go b/src/runtime/histogram.go index da4910d341..0cccbcca16 100644 --- a/src/runtime/histogram.go +++ b/src/runtime/histogram.go @@ -81,6 +81,10 @@ type timeHistogram struct { } // record adds the given duration to the distribution. +// +// Disallow preemptions and stack growths because this function +// may run in sensitive locations. +//go:nosplit func (h *timeHistogram) record(duration int64) { if duration < 0 { atomic.Xadd64(&h.underflow, 1) |