diff options
| author | Shenghou Ma <minux.ma@gmail.com> | 2012-12-18 22:57:25 +0800 |
|---|---|---|
| committer | Shenghou Ma <minux.ma@gmail.com> | 2012-12-18 22:57:25 +0800 |
| commit | 7777bac6e4570ffe485f736e79f0631a460171f4 (patch) | |
| tree | cb2fc50b5982cf329e3cbf6fef0501f0fa77dcc5 /src/pkg/runtime/sys_linux_arm.s | |
| parent | 5b46fc417fdc908fd41d1e88a909d8e92a29504c (diff) | |
| download | go-7777bac6e4570ffe485f736e79f0631a460171f4.tar.xz | |
runtime: use clock_gettime to get ns resolution for time.now & runtime.nanotime
For Linux/{386,arm}, FreeBSD/{386,amd64,arm}, NetBSD/{386,amd64}, OpenBSD/{386,amd64}.
Note: our Darwin implementation already has ns resolution.
Linux/386 (Core i7-2600 @ 3.40GHz, kernel 3.5.2-gentoo)
benchmark old ns/op new ns/op delta
BenchmarkNow 110 118 +7.27%
Linux/ARM (ARM Cortex-A8 @ 800MHz, kernel 2.6.32.28 android)
benchmark old ns/op new ns/op delta
BenchmarkNow 625 542 -13.28%
Linux/ARM (ARM Cortex-A9 @ 1GHz, Pandaboard)
benchmark old ns/op new ns/op delta
BenchmarkNow 992 909 -8.37%
FreeBSD 9-REL-p1/amd64 (Dell R610 Server with Xeon X5650 @ 2.67GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 699 695 -0.57%
FreeBSD 9-REL-p1/amd64 (Atom D525 @ 1.80GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 1553 1658 +6.76%
OpenBSD/amd64 (Dell E6410 with i5 CPU M 540 @ 2.53GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 1262 1236 -2.06%
OpenBSD/i386 (Asus eeePC 701 with Intel Celeron M 900MHz - locked to 631MHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 5089 5043 -0.90%
NetBSD/i386 (VMware VM with Core i5 CPU @ 2.7GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 277 278 +0.36%
NetBSD/amd64 (VMware VM with Core i5 CPU @ 2.7Ghz)
benchmark old ns/op new ns/op delta
BenchmarkNow 103 105 +1.94%
Thanks Maxim Khitrov, Joel Sing, and Dave Cheney for providing benchmark data.
R=jsing, dave, rsc
CC=golang-dev
https://golang.org/cl/6820120
Diffstat (limited to 'src/pkg/runtime/sys_linux_arm.s')
| -rw-r--r-- | src/pkg/runtime/sys_linux_arm.s | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/src/pkg/runtime/sys_linux_arm.s b/src/pkg/runtime/sys_linux_arm.s index 38bcebfa1a..ec5b0ca135 100644 --- a/src/pkg/runtime/sys_linux_arm.s +++ b/src/pkg/runtime/sys_linux_arm.s @@ -35,6 +35,7 @@ #define SYS_select (SYS_BASE + 142) // newselect #define SYS_ugetrlimit (SYS_BASE + 191) #define SYS_sched_getaffinity (SYS_BASE + 242) +#define SYS_clock_gettime (SYS_BASE + 263) #define ARM_BASE (SYS_BASE + 0x0f0000) #define SYS_ARM_cacheflush (ARM_BASE + 2) @@ -155,41 +156,37 @@ TEXT runtime·mincore(SB),7,$0 RET TEXT time·now(SB), 7, $32 - MOVW $8(R13), R0 // timeval - MOVW $0, R1 // zone - MOVW $SYS_gettimeofday, R7 + MOVW $0, R0 // CLOCK_REALTIME + MOVW $8(R13), R1 // timespec + MOVW $SYS_clock_gettime, R7 SWI $0 MOVW 8(R13), R0 // sec - MOVW 12(R13), R2 // usec + MOVW 12(R13), R2 // nsec MOVW R0, 0(FP) MOVW $0, R1 MOVW R1, 4(FP) - MOVW $1000, R3 - MUL R3, R2 MOVW R2, 8(FP) RET // int64 nanotime(void) so really // void nanotime(int64 *nsec) TEXT runtime·nanotime(SB),7,$32 - MOVW $8(R13), R0 // timeval - MOVW $0, R1 // zone - MOVW $SYS_gettimeofday, R7 + MOVW $0, R0 // CLOCK_REALTIME + MOVW $8(R13), R1 // timespec + MOVW $SYS_clock_gettime, R7 SWI $0 MOVW 8(R13), R0 // sec - MOVW 12(R13), R2 // usec + MOVW 12(R13), R2 // nsec MOVW $1000000000, R3 MULLU R0, R3, (R1, R0) - MOVW $1000, R3 MOVW $0, R4 - MUL R3, R2 ADD.S R2, R0 ADC R4, R1 - + MOVW 0(FP), R3 MOVW R0, 0(R3) MOVW R1, 4(R3) |