inline void smp_local_timer_interrupt(struct pt_regs *regs)
{
int user = user_mode(regs);
int cpu = smp_processor_id();
/*
* The profiling function is SMP safe. (nothing can mess
* around with "current", and the profiling counters are
* updated with atomic operations). This is especially
* useful with a profiling multiplier != 1
*/
if (!user)
x86_do_profile(regs->rip);
if (--prof_counter[cpu] <= 0)
{
/*
* The multiplier may have changed since the last time we got
* to this point as a result of the user writing to
* /proc/profile. In this case we need to adjust the APIC
* timer accordingly.
*
* Interrupts are already masked off at this point.
*/
prof_counter[cpu] = prof_multiplier[cpu];
if (prof_counter[cpu] != prof_old_multiplier[cpu])
{
__setup_APIC_LVTT(calibration_result/prof_counter[cpu]);
prof_old_multiplier[cpu] = prof_counter[cpu];
}
#ifdef CONFIG_SMP
update_process_times(user);
#endif
}
/*
* We take the 'long' return path, and there every subsystem
* grabs the apropriate locks (kernel lock/ irq lock).
*
* we might want to decouple profiling from the 'long path',
* and do the profiling totally in assembly.
*
* Currently this isn't too much of an issue (performance wise),
* we can take more than 100K local irqs per second on a 100 MHz P5.
*/
}
inline void smp_local_timer_interrupt(struct pt_regs * regs)
{
int cpu = smp_processor_id();
x86_do_profile(regs);
if (--per_cpu(prof_counter, cpu) <= 0) {
/*
* The multiplier may have changed since the last time we got
* to this point as a result of the user writing to
* /proc/profile. In this case we need to adjust the APIC
* timer accordingly.
*
* Interrupts are already masked off at this point.
*/
per_cpu(prof_counter, cpu) = per_cpu(prof_multiplier, cpu);
if (per_cpu(prof_counter, cpu) !=
per_cpu(prof_old_multiplier, cpu)) {
__setup_APIC_LVTT(
calibration_result/
per_cpu(prof_counter, cpu));
per_cpu(prof_old_multiplier, cpu) =
per_cpu(prof_counter, cpu);
}
#ifdef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
}
/*
* We take the 'long' return path, and there every subsystem
* grabs the apropriate locks (kernel lock/ irq lock).
*
* we might want to decouple profiling from the 'long path',
* and do the profiling totally in assembly.
*
* Currently this isn't too much of an issue (performance wise),
* we can take more than 100K local irqs per second on a 100 MHz P5.
*/
}
