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runtime: change GNU/Linux usleep to use nanosleep

Browse Source 
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>
This commit is contained in:
Ian Lance Taylor 2018-04-20 15:30:52 -07:00
parent a3c75d9b31
commit 665b9b3476
8 changed files with 36 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/runtime/sys_linux_386.s
View File

@ -39,6 +39,7 @@
#define SYS_setittimer 104
#define SYS_clone 120
#define SYS_sched_yield 158
#define SYS_nanosleep 162
#define SYS_rt_sigreturn 173
#define SYS_rt_sigaction 174
#define SYS_rt_sigprocmask 175
@ -56,7 +57,6 @@
#define SYS_epoll_ctl 255
#define SYS_epoll_wait 256
#define SYS_clock_gettime 265
#define SYS_pselect6 308
#define SYS_epoll_create1 329
TEXT runtime·exit(SB),NOSPLIT,$0
@ -141,14 +141,10 @@ TEXT runtime·usleep(SB),NOSPLIT,$8
MULL DX
MOVL AX, 4(SP)
// pselect6(0, 0, 0, 0, &ts, 0)
MOVL $SYS_pselect6, AX
MOVL $0, BX
// nanosleep(&ts, 0)
MOVL $SYS_nanosleep, AX
LEAL 0(SP), BX
MOVL $0, CX
MOVL $0, DX
MOVL $0, SI
LEAL 0(SP), DI
MOVL $0, BP
INVOKE_SYSCALL
RET

12
src/runtime/sys_linux_amd64.s
View File

@ -24,6 +24,7 @@
#define SYS_sched_yield 24
#define SYS_mincore 27
#define SYS_madvise 28
#define SYS_nanosleep 35
#define SYS_setittimer 38
#define SYS_getpid 39
#define SYS_socket 41
@ -43,7 +44,6 @@
#define SYS_epoll_ctl 233
#define SYS_openat 257
#define SYS_faccessat 269
#define SYS_pselect6 270
#define SYS_epoll_pwait 281
#define SYS_epoll_create1 291
@ -123,14 +123,10 @@ TEXT runtime·usleep(SB),NOSPLIT,$16
MULL DX
MOVQ AX, 8(SP)
// pselect6(0, 0, 0, 0, &ts, 0)
MOVL $0, DI
// nanosleep(&ts, 0)
MOVQ SP, DI
MOVL $0, SI
MOVL $0, DX
MOVL $0, R10
MOVQ SP, R8
MOVL $0, R9
MOVL $SYS_pselect6, AX
MOVL $SYS_nanosleep, AX
SYSCALL
RET

10
src/runtime/sys_linux_arm.s
View File

@ -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

14
src/runtime/sys_linux_arm64.s
View File

@ -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

12
src/runtime/sys_linux_mips64x.s
View File

@ -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

13
src/runtime/sys_linux_mipsx.s
View File

@ -26,8 +26,8 @@
#define SYS_munmap 4091
#define SYS_setitimer 4104
#define SYS_clone 4120
#define SYS_newselect 4142
#define SYS_sched_yield 4162
#define SYS_nanosleep 4166
#define SYS_rt_sigreturn 4193
#define SYS_rt_sigaction 4194
#define SYS_rt_sigprocmask 4195
@ -115,19 +115,16 @@ TEXT runtime·usleep(SB),NOSPLIT,$28-4
DIVU R4, R3
MOVW LO, R3
MOVW R3, 24(R29)
MOVW $1000, R4
MULU R3, R4
MOVW LO, R4
SUBU R4, R5
MOVW R5, 28(R29)
// select(0, 0, 0, 0, &tv)
MOVW $0, R4
// nanosleep(&ts, 0)
ADDU $24, R29, R4
MOVW $0, R5
MOVW $0, R6
MOVW $0, R7
ADDU $24, R29, R8
MOVW R8, 16(R29)
MOVW $SYS_newselect, R2
MOVW $SYS_nanosleep, R2
SYSCALL
RET

12
src/runtime/sys_linux_ppc64x.s
View File

@ -27,8 +27,8 @@
#define SYS_munmap 91
#define SYS_setitimer 104
#define SYS_clone 120
#define SYS_newselect 142
#define SYS_sched_yield 158
#define SYS_nanosleep 162
#define SYS_rt_sigreturn 172
#define SYS_rt_sigaction 173
#define SYS_rt_sigprocmask 174
@ -106,17 +106,15 @@ TEXT runtime·usleep(SB),NOSPLIT,$16-4
MOVW $1000000, R4
DIVD R4, R3
MOVD R3, 8(R1)
MOVW $1000, R4
MULLD R3, R4
SUB R4, R5
MOVD R5, 16(R1)
// select(0, 0, 0, 0, &tv)
MOVW $0, R3
// nanosleep(&ts, 0)
ADD $8, R1, R3
MOVW $0, R4
MOVW $0, R5
MOVW $0, R6
ADD $8, R1, R7
SYSCALL $SYS_newselect
SYSCALL $SYS_nanosleep
RET
TEXT runtime·gettid(SB),NOSPLIT,$0-4

12
src/runtime/sys_linux_s390x.s
View File

@ -22,8 +22,8 @@
#define SYS_munmap 91
#define SYS_setitimer 104
#define SYS_clone 120
#define SYS_select 142
#define SYS_sched_yield 158
#define SYS_nanosleep 162
#define SYS_rt_sigreturn 173
#define SYS_rt_sigaction 174
#define SYS_rt_sigprocmask 175
@ -110,17 +110,15 @@ TEXT runtime·usleep(SB),NOSPLIT,$16-4
MOVW $1000000, R3
DIVD R3, R2
MOVD R2, 8(R15)
MOVW $1000, R3
MULLD R2, R3
SUB R3, R4
MOVD R4, 16(R15)
// select(0, 0, 0, 0, &tv)
MOVW $0, R2
// nanosleep(&ts, 0)
ADD $8, R15, R2
MOVW $0, R3
MOVW $0, R4
MOVW $0, R5
ADD $8, R15, R6
MOVW $SYS_select, R1
MOVW $SYS_nanosleep, R1
SYSCALL
RET