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Subject[PATCH] [3/48] x86_64: Use new shared sched_clock in x86-64 too
Date

Signed-off-by: Andi Kleen <ak@suse.de>

---
arch/x86_64/kernel/Makefile | 3 ++-
arch/x86_64/kernel/time.c | 1 -
arch/x86_64/kernel/tsc.c | 28 ----------------------------
include/asm-x86_64/timer.h | 1 +
include/asm-x86_64/timex.h | 1 -
5 files changed, 3 insertions(+), 31 deletions(-)
Index: linux/arch/x86_64/kernel/Makefile
===================================================================
--- linux.orig/arch/x86_64/kernel/Makefile
+++ linux/arch/x86_64/kernel/Makefile
@@ -8,7 +8,7 @@ obj-y := process.o signal.o entry.o trap
ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_x86_64.o \
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
+ pci-dma.o pci-nommu.o alternative.o hpet.o tsc.o sched-clock.o

obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_X86_MCE) += mce.o therm_throt.o
@@ -57,3 +57,4 @@ i8237-y += ../../i386/kernel/i8237.o
msr-$(subst m,y,$(CONFIG_X86_MSR)) += ../../i386/kernel/msr.o
alternative-y += ../../i386/kernel/alternative.o
pcspeaker-y += ../../i386/kernel/pcspeaker.o
+sched-clock-y += ../../i386/kernel/sched-clock.o
Index: linux/arch/x86_64/kernel/tsc.c
===================================================================
--- linux.orig/arch/x86_64/kernel/tsc.c
+++ linux/arch/x86_64/kernel/tsc.c
@@ -16,32 +16,6 @@ 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;

static inline int check_tsc_unstable(void)
@@ -114,8 +88,6 @@ static int time_cpufreq_notifier(struct
mark_tsc_unstable();
}

- set_cyc2ns_scale(tsc_khz_ref);
-
return 0;
}

Index: linux/include/asm-x86_64/timer.h
===================================================================
--- /dev/null
+++ linux/include/asm-x86_64/timer.h
@@ -0,0 +1 @@
+#define get_scheduled_cycles(x) rdtscll(x)
Index: linux/arch/x86_64/kernel/time.c
===================================================================
--- linux.orig/arch/x86_64/kernel/time.c
+++ linux/arch/x86_64/kernel/time.c
@@ -404,7 +404,6 @@ 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
@@ -28,5 +28,4 @@ extern int read_current_timer(unsigned l
#define US_SCALE 32 /* 2^32, arbitralrily chosen */

extern void mark_tsc_unstable(void);
-extern void set_cyc2ns_scale(unsigned long khz);
#endif
-
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