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runtime: update and access scavengeGoal atomically

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The first step toward acquiring the heap lock less frequently in the
scavenger.

Change-Id: Idc69fd8602be2c83268c155951230d60e20b42fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/353973
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 2021-10-04 19:52:48 +00:00 • committed by Michael Knyszek
parent 9b2dd1f771
commit fc5e8cd6c9
2 changed files with 9 additions and 6 deletions
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7
src/runtime/mheap.go
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@ -111,6 +111,8 @@ type mheap struct {
// scavengeGoal is the amount of total retained heap memory (measured by
// heapRetained) that the runtime will try to maintain by returning memory
// to the OS.
//
// Accessed atomically.
scavengeGoal uint64
// Page reclaimer state
@ -1399,9 +1401,10 @@ func (h *mheap) grow(npage uintptr) bool {
// By scavenging inline we deal with the failure to allocate out of
// memory fragments by scavenging the memory fragments that are least
// likely to be re-used.
if retained := heapRetained(); retained+uint64(totalGrowth) > h.scavengeGoal {
scavengeGoal := atomic.Load64(&h.scavengeGoal)
if retained := heapRetained(); retained+uint64(totalGrowth) > scavengeGoal {
todo := totalGrowth
if overage := uintptr(retained + uint64(totalGrowth) - h.scavengeGoal); todo > overage {
if overage := uintptr(retained + uint64(totalGrowth) - scavengeGoal); todo > overage {
todo = overage
}
h.pages.scavenge(todo, false)