[PATCH] [5/45] x86_64: Use new shared sched_clock in x86-64 too

Andi Kleen
2007-09-21T20:46:41Z

arch/x86_64/kernel/Makefile | 3 ++-
arch/x86_64/kernel/time.c | 1 -
arch/x86_64/kernel/tsc.c | 29 +----------------------------
include/asm-x86_64/timer.h | 5 +++++
include/asm-x86_64/timex.h | 1 -
5 files changed, 8 insertions(+), 31 deletions(-)

Index: linux/arch/x86_64/kernel/tsc.c
===================================================================
--- linux.orig/arch/x86_64/kernel/tsc.c
+++ linux/arch/x86_64/kernel/tsc.c
@@ -8,6 +8,7 @@
#include <linux/cpufreq.h>

#include <asm/timex.h>
+#include <asm/tsc.h>

static int notsc __initdata = 0;

@@ -16,32 +17,6 @@ EXPORT_SYMBOL(cpu_khz);
unsigned int tsc_khz;
EXPORT_SYMBOL(tsc_khz);

-static unsigned int cyc2ns_scale __read_mostly;
-
-void set_cyc2ns_scale(unsigned long khz)
-{
- cyc2ns_scale = (NSEC_PER_MSEC << NS_SCALE) / khz;
-}
-
-static unsigned long long cycles_2_ns(unsigned long long cyc)
-{
- return (cyc * cyc2ns_scale) >> NS_SCALE;
-}
-
-unsigned long long sched_clock(void)
-{
- unsigned long a = 0;
-
- /* Could do CPU core sync here. Opteron can execute rdtsc speculatively,
- * which means it is not completely exact and may not be monotonous
- * between CPUs. But the errors should be too small to matter for
- * scheduling purposes.
- */
-
- rdtscll(a);
- return cycles_2_ns(a);
-}
-
static int tsc_unstable;

inline int check_tsc_unstable(void)
@@ -98,8 +73,6 @@ static int time_cpufreq_notifier(struct
mark_tsc_unstable("cpufreq changes");
}

- set_cyc2ns_scale(tsc_khz_ref);
-
return 0;
}

Index: linux/arch/x86_64/kernel/time.c
===================================================================
--- linux.orig/arch/x86_64/kernel/time.c
+++ linux/arch/x86_64/kernel/time.c
@@ -398,7 +398,6 @@ void __init time_init(void)
else
vgetcpu_mode = VGETCPU_LSL;

- set_cyc2ns_scale(tsc_khz);
printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n",
cpu_khz / 1000, cpu_khz % 1000);
init_tsc_clocksource();
Index: linux/include/asm-x86_64/timex.h
===================================================================
--- linux.orig/include/asm-x86_64/timex.h
+++ linux/include/asm-x86_64/timex.h
@@ -27,5 +27,4 @@ extern int read_current_timer(unsigned l
#define US_SCALE 32 /* 2^32, arbitralrily chosen */

extern void mark_tsc_unstable(char *msg);
-extern void set_cyc2ns_scale(unsigned long khz);
#endif
Index: linux/arch/x86_64/kernel/Makefile
===================================================================
--- linux.orig/arch/x86_64/kernel/Makefile
+++ linux/arch/x86_64/kernel/Makefile
@@ -9,7 +9,7 @@ obj-y := process.o signal.o entry.o trap
x8664_ksyms.o i387.o syscall.o vsyscall.o \
setup64.o bootflag.o e820.o reboot.o quirks.o i8237.o \
pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o bugs.o \
- perfctr-watchdog.o
+ perfctr-watchdog.o sched-clock.o

obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_X86_MCE) += mce.o therm_throt.o
@@ -62,3 +62,4 @@ msr-$(subst m,y,$(CONFIG_X86_MSR)) += .
alternative-y += ../../i386/kernel/alternative.o
pcspeaker-y += ../../i386/kernel/pcspeaker.o
perfctr-watchdog-y += ../../i386/kernel/cpu/perfctr-watchdog.o
+sched-clock-y += ../../i386/kernel/sched-clock.o
Index: linux/include/asm-x86_64/timer.h
===================================================================
--- /dev/null
+++ linux/include/asm-x86_64/timer.h
@@ -0,0 +1,5 @@
+#ifndef _ASM_TIMER_H
+#define _ASM_TIMER_H 1
+
+#endif
+