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/**
* @file timer_int.c
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/irq.h>
#include <linux/oprofile.h>
#include <linux/profile.h>
#include <asm/ptrace.h>
static int timer_notify(struct notifier_block * self, unsigned long val, void * data)
{
struct pt_regs * regs = (struct pt_regs *)data;
int cpu = smp_processor_id();
unsigned long pc = instruction_pointer(regs);
int is_kernel = !user_mode(regs);
oprofile_add_sample(pc, is_kernel, 0, cpu);
return 0;
}
static struct notifier_block timer_notifier = {
.notifier_call = timer_notify,
};
static int timer_start(void)
{
return register_profile_notifier(&timer_notifier);
}
static void timer_stop(void)
{
unregister_profile_notifier(&timer_notifier);
}
static struct oprofile_operations timer_ops = {
.start = timer_start,
.stop = timer_stop,
.cpu_type = "timer"
};
void __init timer_init(struct oprofile_operations ** ops)
{
*ops = &timer_ops;
printk(KERN_INFO "oprofile: using timer interrupt.\n");
}
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