From e44f456f1d0e429e08afed64a161175ff493f3ac Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Wed, 27 Feb 2019 05:05:44 +0100 Subject: [PATCH] runtime: use CLOCK_BOOTTIME in nanotime on Linux This makes timers account for having expired while a computer was asleep, which is quite common on mobile devices. Note that BOOTTIME is identical to MONOTONIC, except that it takes into account time spent in suspend. In Linux 4.17, the kernel will actually make MONOTONIC act like BOOTTIME anyway, so this switch will additionally unify the timer behavior across kernels. BOOTTIME was introduced into Linux 2.6.39-rc1 with 70a08cca1227d in 2011. Fixes #24595 Change-Id: I7b2a6ca0c5bc5fce57ec0eeafe7b68270b429321 --- src/runtime/sys_linux_386.s | 4 ++-- src/runtime/sys_linux_amd64.s | 2 +- src/runtime/sys_linux_arm.s | 4 ++-- src/runtime/sys_linux_arm64.s | 4 ++-- src/runtime/sys_linux_mips64x.s | 2 +- src/runtime/sys_linux_mipsx.s | 2 +- src/runtime/sys_linux_ppc64x.s | 2 +- src/runtime/sys_linux_s390x.s | 2 +- 8 files changed, 11 insertions(+), 11 deletions(-) diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s index 1b28098ad9..46b7071ed8 100644 --- a/src/runtime/sys_linux_386.s +++ b/src/runtime/sys_linux_386.s @@ -317,13 +317,13 @@ noswitch: LEAL 8(SP), BX // &ts (struct timespec) MOVL BX, 4(SP) - MOVL $1, 0(SP) // CLOCK_MONOTONIC + MOVL $7, 0(SP) // CLOCK_BOOTTIME CALL AX JMP finish fallback: MOVL $SYS_clock_gettime, AX - MOVL $1, BX // CLOCK_MONOTONIC + MOVL $7, BX // CLOCK_BOOTTIME LEAL 8(SP), CX INVOKE_SYSCALL diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s index 58d3bc54b4..4bb9bde3d0 100644 --- a/src/runtime/sys_linux_amd64.s +++ b/src/runtime/sys_linux_amd64.s @@ -293,7 +293,7 @@ noswitch: MOVQ runtime·vdsoClockgettimeSym(SB), AX CMPQ AX, $0 JEQ fallback - MOVL $1, DI // CLOCK_MONOTONIC + MOVL $7, DI // CLOCK_BOOTTIME LEAQ 0(SP), SI CALL AX MOVQ 0(SP), AX // sec diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s index e103da56dc..0b872b90a6 100644 --- a/src/runtime/sys_linux_arm.s +++ b/src/runtime/sys_linux_arm.s @@ -11,7 +11,7 @@ #include "textflag.h" #define CLOCK_REALTIME 0 -#define CLOCK_MONOTONIC 1 +#define CLOCK_BOOTTIME 7 // for EABI, as we don't support OABI #define SYS_BASE 0x0 @@ -345,7 +345,7 @@ noswitch: SUB $24, R13 // Space for results BIC $0x7, R13 // Align for C code - MOVW $CLOCK_MONOTONIC, R0 + MOVW $CLOCK_BOOTTIME, R0 MOVW $8(R13), R1 // timespec MOVW runtime·vdsoClockgettimeSym(SB), R2 CMP $0, R2 diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s index b9588cec30..e444d50df4 100644 --- a/src/runtime/sys_linux_arm64.s +++ b/src/runtime/sys_linux_arm64.s @@ -13,7 +13,7 @@ #define AT_FDCWD -100 #define CLOCK_REALTIME 0 -#define CLOCK_MONOTONIC 1 +#define CLOCK_BOOTTIME 7 #define SYS_exit 93 #define SYS_read 63 @@ -297,7 +297,7 @@ noswitch: BIC $15, R1 MOVD R1, RSP - MOVW $CLOCK_MONOTONIC, R0 + MOVW $CLOCK_BOOTTIME, R0 MOVD runtime·vdsoClockgettimeSym(SB), R2 CBZ R2, fallback diff --git a/src/runtime/sys_linux_mips64x.s b/src/runtime/sys_linux_mips64x.s index 723cfe43d9..edd7a195eb 100644 --- a/src/runtime/sys_linux_mips64x.s +++ b/src/runtime/sys_linux_mips64x.s @@ -278,7 +278,7 @@ noswitch: AND $~15, R1 // Align for C code MOVV R1, R29 - MOVW $1, R4 // CLOCK_MONOTONIC + MOVW $7, R4 // CLOCK_BOOTTIME MOVV $0(R29), R5 MOVV runtime·vdsoClockgettimeSym(SB), R25 diff --git a/src/runtime/sys_linux_mipsx.s b/src/runtime/sys_linux_mipsx.s index 15893a7a28..f3edf9a83a 100644 --- a/src/runtime/sys_linux_mipsx.s +++ b/src/runtime/sys_linux_mipsx.s @@ -235,7 +235,7 @@ TEXT runtime·walltime1(SB),NOSPLIT,$8-12 RET TEXT runtime·nanotime1(SB),NOSPLIT,$8-8 - MOVW $1, R4 // CLOCK_MONOTONIC + MOVW $7, R4 // CLOCK_BOOTTIME MOVW $4(R29), R5 MOVW $SYS_clock_gettime, R2 SYSCALL diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s index 8629fe3233..2402e2623a 100644 --- a/src/runtime/sys_linux_ppc64x.s +++ b/src/runtime/sys_linux_ppc64x.s @@ -233,7 +233,7 @@ fallback: JMP finish TEXT runtime·nanotime1(SB),NOSPLIT,$16 - MOVD $1, R3 // CLOCK_MONOTONIC + MOVD $7, R3 // CLOCK_BOOTTIME MOVD R1, R15 // R15 is unchanged by C code MOVD g_m(g), R21 // R21 = m diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/sys_linux_s390x.s index c15a1d5364..f52c4d5098 100644 --- a/src/runtime/sys_linux_s390x.s +++ b/src/runtime/sys_linux_s390x.s @@ -207,7 +207,7 @@ TEXT runtime·walltime1(SB),NOSPLIT,$16 RET TEXT runtime·nanotime1(SB),NOSPLIT,$16 - MOVW $1, R2 // CLOCK_MONOTONIC + MOVW $7, R2 // CLOCK_BOOTTIME MOVD $tp-16(SP), R3 MOVW $SYS_clock_gettime, R1 SYSCALL -- 2.25.1