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| author | Ian Lance Taylor <iant@golang.org> | 2018-04-20 15:30:52 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2018-04-24 05:01:13 +0000 |
| commit | 665b9b3476ad0a6dc4e578e42e6c63012e23aaa0 (patch) | |
| tree | 4848606a8cb62e0a46e8f70983a2d32c75836ef3 /src/runtime/sys_linux_arm.s | |
| parent | a3c75d9b313cc9f06969125ff28501c081dac3b8 (diff) | |
| download | go-665b9b3476ad0a6dc4e578e42e6c63012e23aaa0.tar.gz go-665b9b3476ad0a6dc4e578e42e6c63012e23aaa0.zip | |
runtime: change GNU/Linux usleep to use nanosleep
Ever since we added sleep to the runtime back in 2008, we've
implemented it on GNU/Linux with the select (or pselect or pselect6)
system call. But the Linux kernel has a nanosleep system call,
which should be a tiny bit more efficient since it doesn't have to
check to see whether there are any file descriptors. So use it.
Change-Id: Icc3430baca46b082a4d33f97c6c47e25fa91cb9a
Reviewed-on: https://go-review.googlesource.com/108538
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'src/runtime/sys_linux_arm.s')
| -rw-r--r-- | src/runtime/sys_linux_arm.s | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s index 4dd773adce..fc9dc9bbb8 100644 --- a/src/runtime/sys_linux_arm.s +++ b/src/runtime/sys_linux_arm.s @@ -38,7 +38,7 @@ #define SYS_gettid (SYS_BASE + 224) #define SYS_tkill (SYS_BASE + 238) #define SYS_sched_yield (SYS_BASE + 158) -#define SYS_pselect6 (SYS_BASE + 335) +#define SYS_nanosleep (SYS_BASE + 162) #define SYS_sched_getaffinity (SYS_BASE + 242) #define SYS_clock_gettime (SYS_BASE + 263) #define SYS_epoll_create (SYS_BASE + 250) @@ -475,13 +475,9 @@ TEXT runtime·usleep(SB),NOSPLIT,$12 MOVW $1000, R0 // usec to nsec MUL R0, R1 MOVW R1, 8(R13) - MOVW $0, R0 + MOVW $4(R13), R0 MOVW $0, R1 - MOVW $0, R2 - MOVW $0, R3 - MOVW $4(R13), R4 - MOVW $0, R5 - MOVW $SYS_pselect6, R7 + MOVW $SYS_nanosleep, R7 SWI $0 RET |