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From 6998a7866b8428fd49c31506795c9f8154826d13 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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 40b55a67eb..6105780ff4 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -288,13 +288,13 @@ 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 b709f77060..18a1f1d43a 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -261,7 +261,7 @@ 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 43a58335c8..8b93635f4f 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
@@ -291,7 +291,7 @@ 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), R11
CMP $0, R11
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index 8b344be8f8..daf142fba0 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
@@ -247,7 +247,7 @@ noswitch:
BIC $15, R1
MOVD R1, RSP
- MOVW $CLOCK_MONOTONIC, R0
+ MOVW $CLOCK_BOOTTIME, R0
MOVD runtime·vdsoClockgettimeSym(SB), R2
CBZ R2, fallback
BL (R2)
diff --git a/src/runtime/sys_linux_mips64x.s b/src/runtime/sys_linux_mips64x.s
index c45703d228..9842b596e7 100644
--- a/src/runtime/sys_linux_mips64x.s
+++ b/src/runtime/sys_linux_mips64x.s
@@ -189,7 +189,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$16
RET
TEXT runtime·nanotime(SB),NOSPLIT,$16
- MOVW $1, R4 // CLOCK_MONOTONIC
+ MOVW $7, R4 // CLOCK_BOOTTIME
MOVV $0(R29), R5
MOVV $SYS_clock_gettime, R2
SYSCALL
diff --git a/src/runtime/sys_linux_mipsx.s b/src/runtime/sys_linux_mipsx.s
index f362b0f3f1..5ab866e047 100644
--- a/src/runtime/sys_linux_mipsx.s
+++ b/src/runtime/sys_linux_mipsx.s
@@ -193,7 +193,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$8-12
RET
TEXT runtime·nanotime(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 6835f434de..46618b2d91 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -204,7 +204,7 @@ fallback:
JMP finish
TEXT runtime·nanotime(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 c79ceea751..44e3258e60 100644
--- a/src/runtime/sys_linux_s390x.s
+++ b/src/runtime/sys_linux_s390x.s
@@ -180,7 +180,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$16
RET
TEXT runtime·nanotime(SB),NOSPLIT,$16
- MOVW $1, R2 // CLOCK_MONOTONIC
+ MOVW $7, R2 // CLOCK_BOOTTIME
MOVD $tp-16(SP), R3
MOVW $SYS_clock_gettime, R1
SYSCALL
--
2.20.1
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