diff options
Diffstat (limited to 'src/runtime/mpagealloc.go')
| -rw-r--r-- | src/runtime/mpagealloc.go | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/runtime/mpagealloc.go b/src/runtime/mpagealloc.go index 4c58fb6e02..83db005051 100644 --- a/src/runtime/mpagealloc.go +++ b/src/runtime/mpagealloc.go @@ -972,6 +972,45 @@ func (p *pageAlloc) free(base, npages uintptr) { p.update(base, npages, true, false) } +// markRandomPaddingPages marks the range of memory [base, base+npages*pageSize] +// as both allocated and scavenged. This is used for randomizing the base heap +// address. Both the alloc and scav bits are set so that the pages are not used +// and so the memory accounting stats are correctly calculated. +// +// Similar to allocRange, it also updates the summaries to reflect the +// newly-updated bitmap. +// +// p.mheapLock must be held. +func (p *pageAlloc) markRandomPaddingPages(base uintptr, npages uintptr) { + assertLockHeld(p.mheapLock) + + limit := base + npages*pageSize - 1 + sc, ec := chunkIndex(base), chunkIndex(limit) + si, ei := chunkPageIndex(base), chunkPageIndex(limit) + if sc == ec { + chunk := p.chunkOf(sc) + chunk.allocRange(si, ei+1-si) + p.scav.index.alloc(sc, ei+1-si) + chunk.scavenged.setRange(si, ei+1-si) + } else { + chunk := p.chunkOf(sc) + chunk.allocRange(si, pallocChunkPages-si) + p.scav.index.alloc(sc, pallocChunkPages-si) + chunk.scavenged.setRange(si, pallocChunkPages-si) + for c := sc + 1; c < ec; c++ { + chunk := p.chunkOf(c) + chunk.allocAll() + p.scav.index.alloc(c, pallocChunkPages) + chunk.scavenged.setAll() + } + chunk = p.chunkOf(ec) + chunk.allocRange(0, ei+1) + p.scav.index.alloc(ec, ei+1) + chunk.scavenged.setRange(0, ei+1) + } + p.update(base, npages, true, true) +} + const ( pallocSumBytes = unsafe.Sizeof(pallocSum(0)) |