* [PATCH] ARM: exynos: mct: cache mct upper count
@ 2012-09-05 21:36 Mandeep Singh Baines
0 siblings, 0 replies; 2+ messages in thread
From: Mandeep Singh Baines @ 2012-09-05 21:36 UTC (permalink / raw)
To: Kukjin Kim, linux-kernel
Cc: Mandeep Singh Baines, Sonny Rao, Olof Johansson, Russell King,
linux-arm-kernel, linux-samsung-soc
Saves one register read.
Before (perf report):
1.40% [k] exynos4_frc_read
|
|--87.20%-- ktime_get_ts
| |
| |--93.60%-- posix_ktime_get_ts
After (perf report):
1.00% [k] exynos4_frc_read
|
|--88.61%-- ktime_get_ts
| |
| |--92.70%-- posix_ktime_get_ts
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
CC: Sonny Rao <sonnyrao@chromium.org>
CC: Olof Johansson <olofj@chromium.org>
CC: Kukjin Kim <kgene.kim@samsung.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: linux-arm-kernel@lists.infradead.org
CC: linux-samsung-soc@vger.kernel.org
---
arch/arm/mach-exynos/mct.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
index b601fb8..2bbd533 100644
--- a/arch/arm/mach-exynos/mct.c
+++ b/arch/arm/mach-exynos/mct.c
@@ -128,8 +128,8 @@ static void exynos4_mct_frc_start(u32 hi, u32 lo)
static cycle_t exynos4_frc_read(struct clocksource *cs)
{
- unsigned int lo, hi;
- u32 hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U);
+ u32 lo, hi;
+ static u32 hi2;
do {
hi = hi2;
--
1.7.7.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] ARM: exynos: mct: cache mct upper count
@ 2012-09-05 21:34 Mandeep Singh Baines
0 siblings, 0 replies; 2+ messages in thread
From: Mandeep Singh Baines @ 2012-09-05 21:34 UTC (permalink / raw)
To: Kukjin Kim, linux-kernel
Cc: Mandeep Singh Baines, Sonny Rao, Olof Johansson, Russell King,
linux-arm-kernel, linux-samsung-soc
Saves one register read.
BUG=none
TEST=See below.
Before (perf report):
1.40% [k] exynos4_frc_read
|
|--87.20%-- ktime_get_ts
| |
| |--93.60%-- posix_ktime_get_ts
After (perf report):
1.00% [k] exynos4_frc_read
|
|--88.61%-- ktime_get_ts
| |
| |--92.70%-- posix_ktime_get_ts
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
CC: Sonny Rao <sonnyrao@chromium.org>
CC: Olof Johansson <olofj@chromium.org>
CC: Kukjin Kim <kgene.kim@samsung.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: linux-arm-kernel@lists.infradead.org
CC: linux-samsung-soc@vger.kernel.org
---
arch/arm/mach-exynos/mct.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
index b601fb8..2bbd533 100644
--- a/arch/arm/mach-exynos/mct.c
+++ b/arch/arm/mach-exynos/mct.c
@@ -128,8 +128,8 @@ static void exynos4_mct_frc_start(u32 hi, u32 lo)
static cycle_t exynos4_frc_read(struct clocksource *cs)
{
- unsigned int lo, hi;
- u32 hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U);
+ u32 lo, hi;
+ static u32 hi2;
do {
hi = hi2;
--
1.7.7.3
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