diff options
Diffstat (limited to 'src/runtime/mbitmap.go')
| -rw-r--r-- | src/runtime/mbitmap.go | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go index 30ec5f1cc9..71efe33741 100644 --- a/src/runtime/mbitmap.go +++ b/src/runtime/mbitmap.go @@ -1912,7 +1912,11 @@ Run: // The bitmask starts at s.startAddr. // The result must be deallocated with dematerializeGCProg. func materializeGCProg(ptrdata uintptr, prog *byte) *mspan { - s := mheap_.allocManual((ptrdata/(8*sys.PtrSize)+pageSize-1)/pageSize, &memstats.gc_sys) + // Each word of ptrdata needs one bit in the bitmap. + bitmapBytes := divRoundUp(ptrdata, 8*sys.PtrSize) + // Compute the number of pages needed for bitmapBytes. + pages := divRoundUp(bitmapBytes, pageSize) + s := mheap_.allocManual(pages, &memstats.gc_sys) runGCProg(addb(prog, 4), nil, (*byte)(unsafe.Pointer(s.startAddr)), 1) return s } |