linux-kernel - [PATCH 2/2] x86-64: Inline vdso clock

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Message-Id: <5bc2d286c924b3fd520c82dacb8de7efb49c0c38.1332475308.git.luto@amacapital.net>
Date:	Thu, 22 Mar 2012 21:15:52 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, john.stultz@...aro.org,
	Andy Lutomirski <luto@....edu>,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH 2/2] x86-64: Inline vdso clock_gettime helpers

From: Andy Lutomirski <luto@....edu>

This is about a 3% speedup on Sandy Bridge.

Signed-off-by: Andy Lutomirski <luto@...capital.net>
---
 arch/x86/vdso/vclock_gettime.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/vdso/vclock_gettime.c b/arch/x86/vdso/vclock_gettime.c
index 6eea70b8..885eff4 100644
--- a/arch/x86/vdso/vclock_gettime.c
+++ b/arch/x86/vdso/vclock_gettime.c
@@ -94,7 +94,8 @@ notrace static inline long vgetns(void)
 	return (v * gtod->clock.mult) >> gtod->clock.shift;
 }
 
-notrace static noinline int do_realtime(struct timespec *ts)
+/* Code size doesn't matter (vdso is 4k anyway) and this is faster. */
+notrace static int __always_inline do_realtime(struct timespec *ts)
 {
 	unsigned long seq, ns;
 	int mode;
@@ -111,7 +112,7 @@ notrace static noinline int do_realtime(struct timespec *ts)
 	return mode;
 }
 
-notrace static noinline int do_monotonic(struct timespec *ts)
+notrace static int do_monotonic(struct timespec *ts)
 {
 	unsigned long seq, ns;
 	int mode;
@@ -128,7 +129,7 @@ notrace static noinline int do_monotonic(struct timespec *ts)
 	return mode;
 }
 
-notrace static noinline int do_realtime_coarse(struct timespec *ts)
+notrace static int do_realtime_coarse(struct timespec *ts)
 {
 	unsigned long seq;
 	do {
@@ -139,7 +140,7 @@ notrace static noinline int do_realtime_coarse(struct timespec *ts)
 	return 0;
 }
 
-notrace static noinline int do_monotonic_coarse(struct timespec *ts)
+notrace static int do_monotonic_coarse(struct timespec *ts)
 {
 	unsigned long seq;
 	do {
-- 
1.7.7.6

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