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runtime: make gcSetTriggerRatio a method of gcControllerState

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gcSetTriggerRatio's purpose is to set a bunch of downstream values when
we choose to commit to a new trigger ratio computed by the gcController.
Now that almost all the inputs it uses to compute the downstream values
are in gcControllerState anyway, make it a method of gcControllerState.

For #44167.

Change-Id: I1b7ea709e8378566f812ae3450ab169d7fb66aea
Reviewed-on: https://go-review.googlesource.com/c/go/+/306599
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 2021-04-01 16:31:29 +00:00 committed by Michael Knyszek
parent eb433ed5a2
commit 728e3dc6f9
2 changed files with 12 additions and 12 deletions
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2
src/runtime/mgc.go
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@ -982,7 +982,7 @@ func gcMarkTermination(nextTriggerRatio float64) {
memstats.last_heap_inuse = memstats.heap_inuse
// Update GC trigger and pacing for the next cycle.
gcSetTriggerRatio(nextTriggerRatio)
gcController.commit(nextTriggerRatio)
// Update timing memstats
now := nanotime()

22
src/runtime/mgcpacer.go
View File

@ -606,7 +606,7 @@ func (c *gcControllerState) findRunnableGCWorker(_p_ *p) *g {
return gp
}
// gcSetTriggerRatio sets the trigger ratio and updates everything
// commit sets the trigger ratio and updates everything
// derived from it: the absolute trigger, the heap goal, mark pacing,
// and sweep pacing.
//
@ -617,7 +617,7 @@ func (c *gcControllerState) findRunnableGCWorker(_p_ *p) *g {
// gcController.heapLive. These must be up to date.
//
// mheap_.lock must be held or the world must be stopped.
func gcSetTriggerRatio(triggerRatio float64) {
func (c *gcControllerState) commit(triggerRatio float64) {
assertWorldStoppedOrLockHeld(&mheap_.lock)
// Compute the next GC goal, which is when the allocated heap
@ -625,7 +625,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
// cycle.
goal := ^uint64(0)
if gcPercent >= 0 {
goal = gcController.heapMarked + gcController.heapMarked*uint64(gcPercent)/100
goal = c.heapMarked + c.heapMarked*uint64(gcPercent)/100
}
// Set the trigger ratio, capped to reasonable bounds.
@ -663,7 +663,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
// certainly undesirable.
triggerRatio = 0
}
gcController.triggerRatio = triggerRatio
c.triggerRatio = triggerRatio
// Compute the absolute GC trigger from the trigger ratio.
//
@ -671,7 +671,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
// grown by the trigger ratio over the marked heap size.
trigger := ^uint64(0)
if gcPercent >= 0 {
trigger = uint64(float64(gcController.heapMarked) * (1 + triggerRatio))
trigger = uint64(float64(c.heapMarked) * (1 + triggerRatio))
// Don't trigger below the minimum heap size.
minTrigger := heapMinimum
if !isSweepDone() {
@ -680,7 +680,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
// that concurrent sweep has some heap growth
// in which to perform sweeping before we
// start the next GC cycle.
sweepMin := atomic.Load64(&gcController.heapLive) + sweepMinHeapDistance
sweepMin := atomic.Load64(&c.heapLive) + sweepMinHeapDistance
if sweepMin > minTrigger {
minTrigger = sweepMin
}
@ -689,7 +689,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
trigger = minTrigger
}
if int64(trigger) < 0 {
print("runtime: next_gc=", memstats.next_gc, " heapMarked=", gcController.heapMarked, " gcController.heapLive=", gcController.heapLive, " initialHeapLive=", work.initialHeapLive, "triggerRatio=", triggerRatio, " minTrigger=", minTrigger, "\n")
print("runtime: next_gc=", memstats.next_gc, " heapMarked=", c.heapMarked, " gcController.heapLive=", c.heapLive, " initialHeapLive=", work.initialHeapLive, "triggerRatio=", triggerRatio, " minTrigger=", minTrigger, "\n")
throw("trigger underflow")
}
if trigger > goal {
@ -701,7 +701,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
}
// Commit to the trigger and goal.
gcController.trigger = trigger
c.trigger = trigger
atomic.Store64(&memstats.next_gc, goal)
if trace.enabled {
traceNextGC()
@ -709,7 +709,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
// Update mark pacing.
if gcphase != _GCoff {
gcController.revise()
c.revise()
}
// Update sweep pacing.
@ -721,7 +721,7 @@ func gcSetTriggerRatio(triggerRatio float64) {
// trigger. Compute the ratio of in-use pages to sweep
// per byte allocated, accounting for the fact that
// some might already be swept.
heapLiveBasis := atomic.Load64(&gcController.heapLive)
heapLiveBasis := atomic.Load64(&c.heapLive)
heapDistance := int64(trigger) - int64(heapLiveBasis)
// Add a little margin so rounding errors and
// concurrent sweep are less likely to leave pages
@ -781,7 +781,7 @@ func setGCPercent(in int32) (out int32) {
gcPercent = in
heapMinimum = defaultHeapMinimum * uint64(gcPercent) / 100
// Update pacing in response to gcPercent change.
gcSetTriggerRatio(gcController.triggerRatio)
gcController.commit(gcController.triggerRatio)
unlock(&mheap_.lock)
})