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Date: Tue, 31 Jul 2007 16:25:08 -0700
From: Christoph Lameter <clameter@....com>
To: linux-kernel@...r.kernel.org
Cc: Christoph Lameter <clameter@....com>
Subject: [PATCH 3/7] Simple Performance Counters: i386 support
Export a cycles_to_ns function
Signed-off-by: Christoph Lameter <clameter@....com>
---
arch/i386/kernel/tsc.c | 2 +-
include/asm-i386/timex.h | 8 ++++++++
2 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index debd7db..c150ac0 100644
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -118,7 +118,7 @@ unsigned long long native_sched_clock(void)
rdtscll(this_offset);
/* return the value in ns */
- return cycles_2_ns(this_offset);
+ return cycles_to_ns(this_offset);
}
/* We need to define a real function for sched_clock, to override the
diff --git a/include/asm-i386/timex.h b/include/asm-i386/timex.h
index 3666044..37b0338 100644
--- a/include/asm-i386/timex.h
+++ b/include/asm-i386/timex.h
@@ -19,4 +19,12 @@
extern int read_current_timer(unsigned long *timer_value);
#define ARCH_HAS_READ_CURRENT_TIMER 1
+extern long cyc2ns_scale;
+#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
+
+static inline unsigned long long cycles_to_ns(unsigned long long cyc)
+{
+ return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR;
+}
+
#endif
--
1.5.2.4
-
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