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runtime: fetch physical page size from the OS

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Currently the physical page size assumed by the runtime is hard-coded.
On Linux the runtime at least fetches the OS page size during init and
sanity checks against the hard-coded value, but they may still differ.
On other OSes we wouldn't even notice.

Add support on all OSes to fetch the actual OS physical page size
during runtime init and lift the sanity check of PhysPageSize from the
Linux init code to general malloc init. Currently this is the only use
of the retrieved page size, but we'll add more shortly.

Updates #12480 and #10180.

Change-Id: I065f2834bc97c71d3208edc17fd990ec9058b6da
Reviewed-on: https://go-review.googlesource.com/25050
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2016-07-18 21:40:02 -04:00
parent d7de8b6d23
commit 276a52de55
14 changed files with 205 additions and 22 deletions
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17
src/runtime/os_netbsd.go
View file

@ -79,8 +79,9 @@ var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)
// From NetBSD's <sys/sysctl.h>
const (
_CTL_HW = 6
_HW_NCPU = 3
_CTL_HW = 6
_HW_NCPU = 3
_HW_PAGESIZE = 7
)
func getncpu() int32 {
@ -94,6 +95,17 @@ func getncpu() int32 {
return 1
}
func getPageSize() uintptr {
mib := [2]uint32{_CTL_HW, _HW_PAGESIZE}
out := uint32(0)
nout := unsafe.Sizeof(out)
ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
if ret >= 0 {
return uintptr(out)
}
return 0
}
//go:nosplit
func semacreate(mp *m) {
}
@ -186,6 +198,7 @@ func netbsdMstart() {
func osinit() {
ncpu = getncpu()
physPageSize = getPageSize()
}
var urandom_dev = []byte("/dev/urandom\x00")