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From 6f345a38d9533db388009d91d29981673dcf95b4 Mon Sep 17 00:00:00 2001
From: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Fri, 04 May 2018 03:48:23 +0200
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
---
diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
index 8d5a4ff..bfad064 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -285,13 +285,13 @@
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 62d8024..8510be4 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -257,7 +257,7 @@
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 aa39732..d29cb88 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
@@ -287,7 +287,7 @@
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 c6afd76..24294e8 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
@@ -243,7 +243,7 @@
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 8e64f1c..521062f 100644
--- a/src/runtime/sys_linux_mips64x.s
+++ b/src/runtime/sys_linux_mips64x.s
@@ -185,7 +185,7 @@
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 a6bca3b..920ed9a 100644
--- a/src/runtime/sys_linux_mipsx.s
+++ b/src/runtime/sys_linux_mipsx.s
@@ -189,7 +189,7 @@
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 483cb8e..11f3c49 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -164,7 +164,7 @@
RET
TEXT runtime·nanotime(SB),NOSPLIT,$16
- MOVW $1, R3 // CLOCK_MONOTONIC
+ MOVW $7, R3 // CLOCK_BOOTTIME
MOVD $0(R1), R4
SYSCALL $SYS_clock_gettime
MOVD 0(R1), R3 // sec
diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/sys_linux_s390x.s
index 1ff110c..e9049e0 100644
--- a/src/runtime/sys_linux_s390x.s
+++ b/src/runtime/sys_linux_s390x.s
@@ -176,7 +176,7 @@
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
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