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Message-Id: <200702060352.l163qeAf000727@zach-dev.vmware.com>
Date: Mon, 5 Feb 2007 19:52:40 -0800
From: Zachary Amsden <zach@...are.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
Rusty Russell <rusty@...tcorp.com.au>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Chris Wright <chrisw@...s-sol.org>,
Zachary Amsden <zach@...are.com>
Subject: [PATCH 2/11] Sched clock paravirt op
diff -r 3e746c0ebcdf arch/i386/kernel/paravirt.c
--- a/arch/i386/kernel/paravirt.c Fri Feb 02 13:54:53 2007 -0800
+++ b/arch/i386/kernel/paravirt.c Fri Feb 02 15:27:50 2007 -0800
@@ -32,6 +32,7 @@
#include <asm/fixmap.h>
#include <asm/apic.h>
#include <asm/tlbflush.h>
+#include <asm/timer.h>
/* nop stub */
static void native_nop(void)
@@ -523,6 +524,8 @@ struct paravirt_ops paravirt_ops = {
.write_msr = native_write_msr,
.read_tsc = native_read_tsc,
.read_pmc = native_read_pmc,
+ .get_scheduled_cycles = native_read_tsc,
+ .get_cpu_khz = native_calculate_cpu_khz,
.load_tr_desc = native_load_tr_desc,
.set_ldt = native_set_ldt,
.load_gdt = native_load_gdt,
diff -r 3e746c0ebcdf arch/i386/kernel/tsc.c
--- a/arch/i386/kernel/tsc.c Fri Feb 02 13:54:53 2007 -0800
+++ b/arch/i386/kernel/tsc.c Fri Feb 02 13:54:53 2007 -0800
@@ -14,6 +14,7 @@
#include <asm/delay.h>
#include <asm/tsc.h>
#include <asm/io.h>
+#include <asm/timer.h>
#include "mach_timer.h"
@@ -102,9 +103,6 @@ unsigned long long sched_clock(void)
{
unsigned long long this_offset;
- if (unlikely(custom_sched_clock))
- return (*custom_sched_clock)();
-
/*
* Fall back to jiffies if there's no TSC available:
*/
@@ -113,13 +111,13 @@ unsigned long long sched_clock(void)
return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);
/* read the Time Stamp Counter: */
- rdtscll(this_offset);
+ get_scheduled_cycles(this_offset);
/* return the value in ns */
return cycles_2_ns(this_offset);
}
-static unsigned long calculate_cpu_khz(void)
+unsigned long native_calculate_cpu_khz(void)
{
unsigned long long start, end;
unsigned long count;
diff -r 3e746c0ebcdf arch/i386/kernel/vmi.c
--- a/arch/i386/kernel/vmi.c Fri Feb 02 13:54:53 2007 -0800
+++ b/arch/i386/kernel/vmi.c Fri Feb 02 15:32:20 2007 -0800
@@ -880,7 +880,7 @@ static int __init activate_vmi(void)
paravirt_ops.setup_boot_clock = vmi_timer_setup_boot_alarm;
paravirt_ops.setup_secondary_clock = vmi_timer_setup_secondary_alarm;
#endif
- custom_sched_clock = vmi_sched_clock;
+ paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles;
}
/*
diff -r 3e746c0ebcdf include/asm-i386/paravirt.h
--- a/include/asm-i386/paravirt.h Fri Feb 02 13:54:53 2007 -0800
+++ b/include/asm-i386/paravirt.h Fri Feb 02 15:27:50 2007 -0800
@@ -94,6 +94,8 @@ struct paravirt_ops
u64 (fastcall *read_tsc)(void);
u64 (fastcall *read_pmc)(void);
+ u64 (*get_scheduled_cycles)(void);
+ unsigned long (*get_cpu_khz)(void);
void (fastcall *load_tr_desc)(void);
void (fastcall *load_gdt)(const struct Xgt_desc_struct *);
@@ -273,6 +275,9 @@ static inline void halt(void)
#define rdtscll(val) (val = paravirt_ops.read_tsc())
+#define get_scheduled_cycles(val) (val = paravirt_ops.get_scheduled_cycles())
+#define calculate_cpu_khz() (paravirt_ops.get_cpu_khz())
+
#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
#define rdpmc(counter,low,high) do { \
diff -r 3e746c0ebcdf include/asm-i386/time.h
--- a/include/asm-i386/time.h Fri Feb 02 13:54:53 2007 -0800
+++ b/include/asm-i386/time.h Fri Feb 02 15:27:50 2007 -0800
@@ -30,7 +30,6 @@ static inline int native_set_wallclock(u
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
-extern unsigned long long native_sched_clock(void);
#else /* !CONFIG_PARAVIRT */
#define get_wallclock() native_get_wallclock()
diff -r 3e746c0ebcdf include/asm-i386/timer.h
--- a/include/asm-i386/timer.h Fri Feb 02 13:54:53 2007 -0800
+++ b/include/asm-i386/timer.h Fri Feb 02 13:54:53 2007 -0800
@@ -4,13 +4,21 @@
#include <linux/pm.h>
#define TICK_SIZE (tick_nsec / 1000)
+
void setup_pit_timer(void);
+unsigned long long native_sched_clock(void);
+unsigned long native_calculate_cpu_khz(void);
+
/* Modifiers for buggy PIT handling */
extern int pit_latch_buggy;
extern int timer_ack;
extern int no_timer_check;
-extern unsigned long long (*custom_sched_clock)(void);
extern int no_sync_cmos_clock;
extern int recalibrate_cpu_khz(void);
+#ifndef CONFIG_PARAVIRT
+#define get_scheduled_cycles(val) rdtscll(val)
+#define calculate_cpu_khz() native_calculate_cpu_khz()
#endif
+
+#endif
diff -r 3e746c0ebcdf arch/i386/kernel/vmitime.c
--- a/arch/i386/kernel/vmitime.c Fri Feb 02 13:54:53 2007 -0800
+++ b/arch/i386/kernel/vmitime.c Fri Feb 02 15:31:35 2007 -0800
@@ -170,7 +170,7 @@ int vmi_set_wallclock(unsigned long now)
return -1;
}
-unsigned long long vmi_sched_clock(void)
+unsigned long long vmi_get_sched_cycles(void)
{
return read_available_cycles();
}
diff -r 3e746c0ebcdf include/asm-i386/vmi_time.h
--- a/include/asm-i386/vmi_time.h Fri Feb 02 13:54:53 2007 -0800
+++ b/include/asm-i386/vmi_time.h Fri Feb 02 15:31:53 2007 -0800
@@ -49,7 +49,7 @@ extern void __init vmi_time_init(void);
extern void __init vmi_time_init(void);
extern unsigned long vmi_get_wallclock(void);
extern int vmi_set_wallclock(unsigned long now);
-extern unsigned long long vmi_sched_clock(void);
+extern unsigned long long vmi_get_sched_cycles(void);
#ifdef CONFIG_X86_LOCAL_APIC
extern void __init vmi_timer_setup_boot_alarm(void);
-
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