diff options
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/vgetrandom_linux.go | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/src/runtime/vgetrandom_linux.go b/src/runtime/vgetrandom_linux.go index 1e8c8ceaf0..af0e9cad1e 100644 --- a/src/runtime/vgetrandom_linux.go +++ b/src/runtime/vgetrandom_linux.go @@ -6,7 +6,10 @@ package runtime -import "unsafe" +import ( + "internal/cpu" + "unsafe" +) func vgetrandom1(buf *byte, length uintptr, flags uint32, state uintptr, stateSize uintptr) int @@ -43,8 +46,9 @@ func vgetrandomGetState() uintptr { lock(&vgetrandomAlloc.statesLock) if len(vgetrandomAlloc.states) == 0 { num := uintptr(ncpu) // Just a reasonable size hint to start. - allocSize := (num*vgetrandomAlloc.stateSize + physPageSize - 1) &^ (physPageSize - 1) - num = (physPageSize / vgetrandomAlloc.stateSize) * (allocSize / physPageSize) + stateSizeCacheAligned := (vgetrandomAlloc.stateSize + cpu.CacheLineSize - 1) &^ (cpu.CacheLineSize - 1) + allocSize := (num*stateSizeCacheAligned + physPageSize - 1) &^ (physPageSize - 1) + num = (physPageSize / stateSizeCacheAligned) * (allocSize / physPageSize) p, err := mmap(nil, allocSize, vgetrandomAlloc.mmapProt, vgetrandomAlloc.mmapFlags, -1, 0) if err != 0 { unlock(&vgetrandomAlloc.statesLock) @@ -59,7 +63,7 @@ func vgetrandomGetState() uintptr { newBlock = (newBlock + physPageSize - 1) &^ (physPageSize - 1) } vgetrandomAlloc.states = append(vgetrandomAlloc.states, newBlock) - newBlock += vgetrandomAlloc.stateSize + newBlock += stateSizeCacheAligned } } state := vgetrandomAlloc.states[len(vgetrandomAlloc.states)-1] |