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Diffstat (limited to 'libgo/go/runtime/malloc.go')
| -rw-r--r-- | libgo/go/runtime/malloc.go | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libgo/go/runtime/malloc.go b/libgo/go/runtime/malloc.go index c0b4caa..68e5494 100644 --- a/libgo/go/runtime/malloc.go +++ b/libgo/go/runtime/malloc.go @@ -335,6 +335,23 @@ const ( // mallocinit. var physPageSize uintptr +// physHugePageSize is the size in bytes of the OS's default physical huge +// page size whose allocation is opaque to the application. It is assumed +// and verified to be a power of two. +// +// If set, this must be set by the OS init code (typically in osinit) before +// mallocinit. However, setting it at all is optional, and leaving the default +// value is always safe (though potentially less efficient). +// +// Since physHugePageSize is always assumed to be a power of two, +// physHugePageShift is defined as physHugePageSize == 1 << physHugePageShift. +// The purpose of physHugePageShift is to avoid doing divisions in +// performance critical functions. +var ( + physHugePageSize uintptr + physHugePageShift uint +) + // OS-defined helpers: // // sysAlloc obtains a large chunk of zeroed memory from the |