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From 61f3ae8298d1c503cbc31539e0f3a73446c7db9d Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Tue, 21 Mar 2023 15:33:56 +0100
Subject: [PATCH] [release-branch.go1.20] 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 | 4 ++--
src/runtime/sys_linux_mipsx.s | 2 +-
src/runtime/sys_linux_ppc64x.s | 2 +-
src/runtime/sys_linux_s390x.s | 2 +-
8 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
index 12a294153d..17e3524b40 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -352,13 +352,13 @@ 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 c7a89ba536..01f0a6a26e 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -255,7 +255,7 @@ noswitch:
SUBQ $16, SP // Space for results
ANDQ $~15, SP // Align for C code
- MOVL $1, DI // CLOCK_MONOTONIC
+ MOVL $7, DI // CLOCK_BOOTTIME
LEAQ 0(SP), SI
MOVQ runtime·vdsoClockgettimeSym(SB), AX
CMPQ AX, $0
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s
index 7b8c4f0e04..9798a1334e 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
@@ -374,7 +374,7 @@ finish:
// func nanotime1() int64
TEXT runtime·nanotime1(SB),NOSPLIT,$12-8
- MOVW $CLOCK_MONOTONIC, R0
+ MOVW $CLOCK_BOOTTIME, R0
MOVW $spec-12(SP), R1 // timespec
MOVW runtime·vdsoClockgettimeSym(SB), R4
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index 38ff6ac330..6b819c5441 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -14,7 +14,7 @@
#define AT_FDCWD -100
#define CLOCK_REALTIME 0
-#define CLOCK_MONOTONIC 1
+#define CLOCK_BOOTTIME 7
#define SYS_exit 93
#define SYS_read 63
@@ -338,7 +338,7 @@ 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 47f2da524d..a8b387f193 100644
--- a/src/runtime/sys_linux_mips64x.s
+++ b/src/runtime/sys_linux_mips64x.s
@@ -326,7 +326,7 @@ 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
@@ -336,7 +336,7 @@ noswitch:
// see walltime for detail
BEQ R2, R0, finish
MOVV R0, runtime·vdsoClockgettimeSym(SB)
- MOVW $1, R4 // CLOCK_MONOTONIC
+ MOVW $7, R4 // CLOCK_BOOTTIME
MOVV $0(R29), R5
JMP fallback
diff --git a/src/runtime/sys_linux_mipsx.s b/src/runtime/sys_linux_mipsx.s
index 5e6b6c1504..7f5fd2a80e 100644
--- a/src/runtime/sys_linux_mipsx.s
+++ b/src/runtime/sys_linux_mipsx.s
@@ -243,7 +243,7 @@ TEXT runtime·walltime(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 d0427a4807..05ee9fede9 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -298,7 +298,7 @@ fallback:
JMP return
TEXT runtime·nanotime1(SB),NOSPLIT,$16-8
- 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 1448670b91..7d2ee3231c 100644
--- a/src/runtime/sys_linux_s390x.s
+++ b/src/runtime/sys_linux_s390x.s
@@ -296,7 +296,7 @@ fallback:
RET
TEXT runtime·nanotime1(SB),NOSPLIT,$32-8
- MOVW $1, R2 // CLOCK_MONOTONIC
+ MOVW $7, R2 // CLOCK_BOOTTIME
MOVD R15, R7 // Backup stack pointer
--
2.17.1
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