runtime: retype mheap.reclaimCredit as atomic.Uintptr
[git-generate]
cd src/runtime
mv export_test.go export.go
GOROOT=$(dirname $(dirname $PWD)) rf '
add mheap.reclaimCredit \
// reclaimCredit is spare credit for extra pages swept. Since \
// the page reclaimer works in large chunks, it may reclaim \
// more than requested. Any spare pages released go to this \
// credit pool. \
reclaimCredit_ atomic.Uintptr
ex {
import "runtime/internal/atomic"
var t mheap
var v, w uintptr
var d uintptr
t.reclaimCredit -> t.reclaimCredit_.Load()
t.reclaimCredit = v -> t.reclaimCredit_.Store(v)
atomic.Loaduintptr(&t.reclaimCredit) -> t.reclaimCredit_.Load()
atomic.LoadAcquintptr(&t.reclaimCredit) -> t.reclaimCredit_.LoadAcquire()
atomic.Storeuintptr(&t.reclaimCredit, v) -> t.reclaimCredit_.Store(v)
atomic.StoreReluintptr(&t.reclaimCredit, v) -> t.reclaimCredit_.StoreRelease(v)
atomic.Casuintptr(&t.reclaimCredit, v, w) -> t.reclaimCredit_.CompareAndSwap(v, w)
atomic.Xchguintptr(&t.reclaimCredit, v) -> t.reclaimCredit_.Swap(v)
atomic.Xadduintptr(&t.reclaimCredit, d) -> t.reclaimCredit_.Add(d)
}
rm mheap.reclaimCredit
mv mheap.reclaimCredit_ mheap.reclaimCredit
'
mv export.go export_test.go
Change-Id: I2c567781a28f5d8c2275ff18f2cf605b82f22d09
Reviewed-on: https://go-review.googlesource.com/c/go/+/356712
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
diff --git a/src/runtime/mgc.go b/src/runtime/mgc.go
index 56ef1c4..6f8463c 100644
--- a/src/runtime/mgc.go
+++ b/src/runtime/mgc.go
@@ -1460,7 +1460,7 @@
mheap_.pagesSwept.Store(0)
mheap_.sweepArenas = mheap_.allArenas
mheap_.reclaimIndex.Store(0)
- mheap_.reclaimCredit = 0
+ mheap_.reclaimCredit.Store(0)
unlock(&mheap_.lock)
sweep.centralIndex.clear()
diff --git a/src/runtime/mgcsweep.go b/src/runtime/mgcsweep.go
index aedd6c3..9c7f9d3 100644
--- a/src/runtime/mgcsweep.go
+++ b/src/runtime/mgcsweep.go
@@ -291,7 +291,7 @@
// Whole span was freed. Count it toward the
// page reclaimer credit since these pages can
// now be used for span allocation.
- atomic.Xadduintptr(&mheap_.reclaimCredit, npages)
+ mheap_.reclaimCredit.Add(npages)
} else {
// Span is still in-use, so this returned no
// pages to the heap and the span needs to
diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go
index fc86023..0e7694a 100644
--- a/src/runtime/mheap.go
+++ b/src/runtime/mheap.go
@@ -124,13 +124,12 @@
// If this is >= 1<<63, the page reclaimer is done scanning
// the page marks.
reclaimIndex atomic.Uint64
+
// reclaimCredit is spare credit for extra pages swept. Since
// the page reclaimer works in large chunks, it may reclaim
// more than requested. Any spare pages released go to this
// credit pool.
- //
- // This is accessed atomically.
- reclaimCredit uintptr
+ reclaimCredit atomic.Uintptr
// arenas is the heap arena map. It points to the metadata for
// the heap for every arena frame of the entire usable virtual
@@ -754,13 +753,13 @@
locked := false
for npage > 0 {
// Pull from accumulated credit first.
- if credit := atomic.Loaduintptr(&h.reclaimCredit); credit > 0 {
+ if credit := h.reclaimCredit.Load(); credit > 0 {
take := credit
if take > npage {
// Take only what we need.
take = npage
}
- if atomic.Casuintptr(&h.reclaimCredit, credit, credit-take) {
+ if h.reclaimCredit.CompareAndSwap(credit, credit-take) {
npage -= take
}
continue
@@ -786,7 +785,7 @@
npage -= nfound
} else {
// Put spare pages toward global credit.
- atomic.Xadduintptr(&h.reclaimCredit, nfound-npage)
+ h.reclaimCredit.Add(nfound - npage)
npage = 0
}
}