From: "tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
x86 <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [tip: timers/core] x86/vdso: Mark the TSC clocksource path likely
Date: Mon, 17 Feb 2020 15:12:00 -0000 [thread overview]
Message-ID: <158195232016.13786.8518739445057683116.tip-bot2@tip-bot2> (raw)
In-Reply-To: <20200207124402.328922847@linutronix.de>
The following commit has been merged into the timers/core branch of tip:
Commit-ID: 50e818715821b89c7abac90a97721f106e893d83
Gitweb: https://git.kernel.org/tip/50e818715821b89c7abac90a97721f106e893d83
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Fri, 07 Feb 2020 13:38:48 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Mon, 17 Feb 2020 14:40:19 +01:00
x86/vdso: Mark the TSC clocksource path likely
Jumping out of line for the TSC clcoksource read is creating awful
code. TSC is likely to be the clocksource at least on bare metal and the PV
interfaces are sufficiently more work that the jump over the TSC read is
just in the noise.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124402.328922847@linutronix.de
---
arch/x86/include/asm/vdso/gettimeofday.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h
index 6ee1f7d..264d4fd 100644
--- a/arch/x86/include/asm/vdso/gettimeofday.h
+++ b/arch/x86/include/asm/vdso/gettimeofday.h
@@ -243,7 +243,7 @@ static u64 vread_hvclock(void)
static inline u64 __arch_get_hw_counter(s32 clock_mode)
{
- if (clock_mode == VCLOCK_TSC)
+ if (likely(clock_mode == VCLOCK_TSC))
return (u64)rdtsc_ordered();
/*
* For any memory-mapped vclock type, we need to make sure that gcc
next prev parent reply other threads:[~2020-02-17 15:12 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-07 12:38 [patch V2 00/17] VDSO consolidation Thomas Gleixner
2020-02-07 12:38 ` [patch V2 01/17] x86/vdso: Mark the TSC clocksource path likely Thomas Gleixner
2020-02-14 12:00 ` Vincenzo Frascino
2020-02-17 15:12 ` tip-bot2 for Thomas Gleixner [this message]
2020-02-07 12:38 ` [patch V2 02/17] ARM: vdso: Remove unused function Thomas Gleixner
2020-02-14 10:21 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 03/17] lib/vdso: Allow the high resolution parts to be compiled out Thomas Gleixner
2020-02-14 11:54 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 04/17] ARM: vdso: Compile high resolution parts conditionally Thomas Gleixner
2020-02-14 11:55 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 05/17] MIPS: " Thomas Gleixner
2020-02-14 11:55 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 06/17] clocksource: Cleanup struct clocksource and documentation Thomas Gleixner
2020-02-14 11:57 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 07/17] x86/vdso: Move VDSO clocksource state tracking to callback Thomas Gleixner
2020-02-14 11:58 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 08/17] clocksource: Add common vdso clock mode storage Thomas Gleixner
2020-02-17 10:36 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 09/17] x86/vdso: Use generic VDSO " Thomas Gleixner
2020-02-14 10:32 ` Paolo Bonzini
2020-02-17 10:57 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 10/17] mips: vdso: " Thomas Gleixner
2020-02-17 10:52 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-17 19:18 ` tip-bot2 for Thomas Gleixner
2020-02-07 12:38 ` [patch V2 11/17] ARM/arm64: vdso: Use common vdso " Thomas Gleixner
2020-02-17 10:43 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-17 19:18 ` tip-bot2 for Thomas Gleixner
[not found] ` <CGME20200221115643eucas1p12ecb95c6161853a0e7dfe9207db079be@eucas1p1.samsung.com>
2020-02-21 11:56 ` [patch V2 11/17] " Marek Szyprowski
2020-02-21 13:08 ` Vincenzo Frascino
2020-02-21 18:24 ` Vincenzo Frascino
2020-02-07 12:38 ` [patch V2 12/17] lib/vdso: Cleanup clock mode storage leftovers Thomas Gleixner
2020-02-17 11:04 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-17 19:18 ` tip-bot2 for Thomas Gleixner
2020-02-07 12:39 ` [patch V2 13/17] lib/vdso: Avoid highres update if clocksource is not VDSO capable Thomas Gleixner
2020-02-17 11:07 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-17 19:18 ` tip-bot2 for Thomas Gleixner
2020-02-07 12:39 ` [patch V2 14/17] lib/vdso: Move VCLOCK_TIMENS to vdso_clock_modes Thomas Gleixner
2020-02-17 11:12 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Thomas Gleixner
2020-02-17 19:18 ` tip-bot2 for Thomas Gleixner
2020-02-07 12:39 ` [patch V2 15/17] lib/vdso: Allow fixed clock mode Thomas Gleixner
2020-02-17 11:14 ` Vincenzo Frascino
2020-02-17 15:11 ` [tip: timers/core] " tip-bot2 for Christophe Leroy
2020-02-17 19:18 ` tip-bot2 for Christophe Leroy
2020-02-07 12:39 ` [patch V2 16/17] lib/vdso: Allow architectures to override the ns shift operation Thomas Gleixner
2020-02-17 11:15 ` Vincenzo Frascino
2020-02-07 12:39 ` [patch V2 17/17] lib/vdso: Allow architectures to provide the vdso data pointer Thomas Gleixner
2020-02-17 12:09 ` Vincenzo Frascino
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