From 665b9b3476ad0a6dc4e578e42e6c63012e23aaa0 Mon Sep 17 00:00:00 2001 From: Ian Lance Taylor Date: Fri, 20 Apr 2018 15:30:52 -0700 Subject: 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 TryBot-Result: Gobot Gobot Reviewed-by: Brad Fitzpatrick --- src/runtime/sys_linux_mips64x.s | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'src/runtime/sys_linux_mips64x.s') diff --git a/src/runtime/sys_linux_mips64x.s b/src/runtime/sys_linux_mips64x.s index 25d13367ad..7632e06fbd 100644 --- a/src/runtime/sys_linux_mips64x.s +++ b/src/runtime/sys_linux_mips64x.s @@ -26,7 +26,7 @@ #define SYS_munmap 5011 #define SYS_setitimer 5036 #define SYS_clone 5055 -#define SYS_newselect 5022 +#define SYS_nanosleep 5034 #define SYS_sched_yield 5023 #define SYS_rt_sigreturn 5211 #define SYS_rt_sigaction 5013 @@ -117,18 +117,16 @@ TEXT runtime·usleep(SB),NOSPLIT,$16-4 DIVVU R4, R3 MOVV LO, R3 MOVV R3, 8(R29) + MOVW $1000, R4 MULVU R3, R4 MOVV LO, R4 SUBVU R4, R5 MOVV R5, 16(R29) - // select(0, 0, 0, 0, &tv) - MOVW $0, R4 + // nanosleep(&ts, 0) + ADDV $8, R29, R4 MOVW $0, R5 - MOVW $0, R6 - MOVW $0, R7 - ADDV $8, R29, R8 - MOVV $SYS_newselect, R2 + MOVV $SYS_nanosleep, R2 SYSCALL RET -- cgit v1.3-5-g9baa