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runtime: add eager scavenging details to GODEBUG=scavtrace=1

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Also, clean up atomics on released-per-cycle while we're here.

For #57069.

Change-Id: I14026e8281f01dea1e8c8de6aa8944712b7b24d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/495916
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Anthony Knyszek 2023-05-17 16:36:07 +00:00 • committed by Michael Knyszek
parent 0bbb54a02d
commit a3e90dc377
5 changed files with 34 additions and 17 deletions
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6
src/runtime/mheap.go
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@ -1323,10 +1323,12 @@ HaveSpan:
track := pp.limiterEvent.start(limiterEventScavengeAssist, start)
// Scavenge, but back out if the limiter turns on.
h.pages.scavenge(bytesToScavenge, func() bool {
released := h.pages.scavenge(bytesToScavenge, func() bool {
return gcCPULimiter.limiting()
}, forceScavenge)
mheap_.pages.scav.releasedEager.Add(released)
// Finish up accounting.
now = nanotime()
if track {
@ -1658,7 +1660,7 @@ func (h *mheap) scavengeAll() {
gp.m.mallocing--
if debug.scavtrace > 0 {
printScavTrace(released, true)
printScavTrace(0, released, true)
}
}