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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_arm64.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_arm64.s')
| -rw-r--r-- | src/runtime/sys_linux_arm64.s | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s index 8a56ba6bab..f930d1f044 100644 --- a/src/runtime/sys_linux_arm64.s +++ b/src/runtime/sys_linux_arm64.s @@ -21,7 +21,7 @@ #define SYS_openat 56 #define SYS_close 57 #define SYS_fcntl 25 -#define SYS_pselect6 72 +#define SYS_nanosleep 101 #define SYS_mmap 222 #define SYS_munmap 215 #define SYS_setitimer 103 @@ -129,14 +129,10 @@ TEXT runtime·usleep(SB),NOSPLIT,$24-4 MUL R4, R5 MOVD R5, 16(RSP) - // pselect6(0, 0, 0, 0, &ts, 0) - MOVD $0, R0 - MOVD R0, R1 - MOVD R0, R2 - MOVD R0, R3 - ADD $8, RSP, R4 - MOVD R0, R5 - MOVD $SYS_pselect6, R8 + // nanosleep(&ts, 0) + ADD $8, RSP, R0 + MOVD $0, R1 + MOVD $SYS_nanosleep, R8 SVC RET |