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[S390] Add per-cpu idle time / idle count sysfs attributes.

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Add two new sysfs entries per cpu: idle_count and idle_time.
idle_count contains the number of times a cpu went into idle state.
idle_time contains the time a cpu spent in idle state in microseconds.
This can be used e.g. by powertop to tell how often idle state is
entered and left.

# cat /sys/devices/system/cpu/cpu0/idle_count
504
# cat /sys/devices/system/cpu/cpu0/idle_time
469734037 us

Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2007-10-22 12:52:39 +02:00
committed by Martin Schwidefsky
parent 32346f47dd
commit fae8b22d3e
3 changed files with 101 additions and 3 deletions
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16
arch/s390/kernel/process.c
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@ -44,6 +44,7 @@
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/timer.h>
#include <asm/cpu.h>
asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
@ -91,6 +92,14 @@ EXPORT_SYMBOL(unregister_idle_notifier);
void do_monitor_call(struct pt_regs *regs, long interruption_code)
{
struct s390_idle_data *idle;
idle = &__get_cpu_var(s390_idle);
spin_lock(&idle->lock);
idle->idle_time += get_clock() - idle->idle_enter;
idle->in_idle = 0;
spin_unlock(&idle->lock);
/* disable monitor call class 0 */
__ctl_clear_bit(8, 15);
@ -105,6 +114,7 @@ extern void s390_handle_mcck(void);
static void default_idle(void)
{
int cpu, rc;
struct s390_idle_data *idle;
/* CPU is going idle. */
cpu = smp_processor_id();
@ -142,6 +152,12 @@ static void default_idle(void)
return;
}
idle = &__get_cpu_var(s390_idle);
spin_lock(&idle->lock);
idle->idle_count++;
idle->in_idle = 1;
idle->idle_enter = get_clock();
spin_unlock(&idle->lock);
trace_hardirqs_on();
/* Wait for external, I/O or machine check interrupt. */
__load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |