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runtime: skip sysmon workaround on NetBSD >= 9.2

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Detect the NetBSD version in osinit and only enable the workaround for
the kernel bug identified in #42515 for NetBSD versions older than 9.2.

For #42515
For #46495

Change-Id: I808846c7f8e47e5f7cc0a2f869246f4bd90d8e22
Reviewed-on: https://go-review.googlesource.com/c/go/+/324472
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Tobias Klauser 2021-06-03 16:57:54 +02:00 committed by Tobias Klauser
parent a05a7d49a9
commit 6406227d71
2 changed files with 16 additions and 1 deletions
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11
src/runtime/os_netbsd.go
View file

@ -101,6 +101,9 @@ var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)
// From NetBSD's <sys/sysctl.h>
const (
_CTL_KERN = 1
_KERN_OSREV = 3
_CTL_HW = 6
_HW_NCPU = 3
_HW_PAGESIZE = 7
@ -138,6 +141,13 @@ func getPageSize() uintptr {
return 0
}
func getOSRev() int {
if osrev, ok := sysctlInt([]uint32{_CTL_KERN, _KERN_OSREV}); ok {
return int(osrev)
}
return 0
}
//go:nosplit
func semacreate(mp *m) {
}
@ -252,6 +262,7 @@ func osinit() {
if physPageSize == 0 {
physPageSize = getPageSize()
}
needSysmonWorkaround = getOSRev() < 902000000 // NetBSD 9.2
}
var urandom_dev = []byte("/dev/urandom\x00")

6
src/runtime/proc.go
View file

@ -5229,6 +5229,10 @@ func checkdead() {
// This is a variable for testing purposes. It normally doesn't change.
var forcegcperiod int64 = 2 * 60 * 1e9
// needSysmonWorkaround is true if the workaround for
// golang.org/issue/42515 is needed on NetBSD.
var needSysmonWorkaround bool = false
// Always runs without a P, so write barriers are not allowed.
//
//go:nowritebarrierrec
@ -5337,7 +5341,7 @@ func sysmon() {
}
}
mDoFixup()
if GOOS == "netbsd" {
if GOOS == "netbsd" && needSysmonWorkaround {
// netpoll is responsible for waiting for timer
// expiration, so we typically don't have to worry
// about starting an M to service timers. (Note that