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runtime: count scavenged bits for new allocation for new page allocator

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This change makes it so that the new page allocator returns the number
of pages that are scavenged in a new allocation so that mheap can update
memstats appropriately.

The accounting could be embedded into pageAlloc, but that would make
the new allocator more difficult to test.

Updates #35112.

Change-Id: I0f94f563d7af2458e6d534f589d2e7dd6af26d12
Reviewed-on: https://go-review.googlesource.com/c/go/+/195698
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Michael Anthony Knyszek 2019-09-10 18:53:51 +00:00 • committed by Michael Knyszek
parent 73317080e1
commit e1ddf0507c
5 changed files with 281 additions and 76 deletions
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15
src/runtime/export_test.go
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@ -751,9 +751,10 @@ type PallocBits pallocBits
func (b *PallocBits) Find(npages uintptr, searchIdx uint) (uint, uint) {
return (*pallocBits)(b).find(npages, searchIdx)
}
func (b *PallocBits) AllocRange(i, n uint) { (*pallocBits)(b).allocRange(i, n) }
func (b *PallocBits) Free(i, n uint) { (*pallocBits)(b).free(i, n) }
func (b *PallocBits) Summarize() PallocSum { return PallocSum((*pallocBits)(b).summarize()) }
func (b *PallocBits) AllocRange(i, n uint) { (*pallocBits)(b).allocRange(i, n) }
func (b *PallocBits) Free(i, n uint) { (*pallocBits)(b).free(i, n) }
func (b *PallocBits) Summarize() PallocSum { return PallocSum((*pallocBits)(b).summarize()) }
func (b *PallocBits) PopcntRange(i, n uint) uint { return (*pageBits)(b).popcntRange(i, n) }
// SummarizeSlow is a slow but more obviously correct implementation
// of (*pallocBits).summarize. Used for testing.
@ -853,8 +854,12 @@ type ChunkIdx chunkIdx
// not in the heap, so is PageAlloc.
type PageAlloc pageAlloc
func (p *PageAlloc) Alloc(npages uintptr) uintptr { return (*pageAlloc)(p).alloc(npages) }
func (p *PageAlloc) Free(base, npages uintptr) { (*pageAlloc)(p).free(base, npages) }
func (p *PageAlloc) Alloc(npages uintptr) (uintptr, uintptr) {
return (*pageAlloc)(p).alloc(npages)
}
func (p *PageAlloc) Free(base, npages uintptr) {
(*pageAlloc)(p).free(base, npages)
}
func (p *PageAlloc) Bounds() (ChunkIdx, ChunkIdx) {
return ChunkIdx((*pageAlloc)(p).start), ChunkIdx((*pageAlloc)(p).end)
}