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| author | Yuval Pavel Zholkover <paulzhol@gmail.com> | 2018-02-05 17:11:27 +0200 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2018-04-18 21:54:26 +0000 |
| commit | 744ccbb852f18241c637b2c6314b35fce7359916 (patch) | |
| tree | 7201dea7cc3ce21462c40af6a646f7ff0c0427db /src/runtime/defs_freebsd.go | |
| parent | 236c567ba9b7767b6f1ebe32eb2d8f0018de8780 (diff) | |
| download | go-744ccbb852f18241c637b2c6314b35fce7359916.tar.gz go-744ccbb852f18241c637b2c6314b35fce7359916.zip | |
runtime: fast clock_gettime call on FreeBSD
Use AT_TIMEKEEP ELF aux entry to access a kernel mapped ring of timehands structs.
The timehands are updated by the kernel periodically, but for accurate measure the
timecounter still needs to be queried.
Currently the fast path is used only when kern.timecounter.hardware==TSC-low
or kern.timecounter.hardware=='ARM MPCore Timecounter',
other timecounters revert back to regular system call.
TODO: add support for HPET timecounter on 386/amd64.
Change-Id: I321ca4e92be63ba21a2574b758ef5c1e729086ad
Reviewed-on: https://go-review.googlesource.com/93156
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src/runtime/defs_freebsd.go')
| -rw-r--r-- | src/runtime/defs_freebsd.go | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/runtime/defs_freebsd.go b/src/runtime/defs_freebsd.go index 9d55111786..f8eaf4167c 100644 --- a/src/runtime/defs_freebsd.go +++ b/src/runtime/defs_freebsd.go @@ -31,6 +31,7 @@ package runtime #include <sys/sysctl.h> #include <sys/cpuset.h> #include <sys/param.h> +#include <sys/vdso.h> */ import "C" @@ -62,6 +63,7 @@ const ( SA_ONSTACK = C.SA_ONSTACK CLOCK_MONOTONIC = C.CLOCK_MONOTONIC + CLOCK_REALTIME = C.CLOCK_REALTIME UMTX_OP_WAIT_UINT = C.UMTX_OP_WAIT_UINT UMTX_OP_WAIT_UINT_PRIVATE = C.UMTX_OP_WAIT_UINT_PRIVATE @@ -147,3 +149,14 @@ type Itimerval C.struct_itimerval type Umtx_time C.struct__umtx_time type Kevent C.struct_kevent + +type bintime C.struct_bintime +type vdsoTimehands C.struct_vdso_timehands +type vdsoTimekeep C.struct_vdso_timekeep + +const ( + _VDSO_TK_VER_CURR = C.VDSO_TK_VER_CURR + + vdsoTimehandsSize = C.sizeof_struct_vdso_timehands + vdsoTimekeepSize = C.sizeof_struct_vdso_timekeep +) |