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time: track accurate idle time with tick_sched.idle_sleeptime

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Current idle time in kstat is based on jiffies and is coarse grained.
tick_sched.idle_sleeptime is making some attempt to keep track of idle time
in a fine grained manner.  But, it is not handling the time spent in
interrupts fully.

Make tick_sched.idle_sleeptime accurate with respect to time spent on
handling interrupts and also add tick_sched.idle_lastupdate, which keeps
track of last time when idle_sleeptime was updated.

This statistics will be crucial for cpufreq-ondemand governor, which can
shed some conservative gaurd band that is uses today while setting the
frequency.  The ondemand changes that uses the exact idle time is coming
soon.

Signed-off-by: Venkatesh Pallipadi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Venki Pallipadi 2008-01-30 13:30:04 +01:00 • committed by Ingo Molnar
commit 6378ddb592
3 changed files with 60 additions and 23 deletions
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7
kernel/softirq.c
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@ -280,9 +280,14 @@ asmlinkage void do_softirq(void)
*/
void irq_enter(void)
{
#ifdef CONFIG_NO_HZ
int cpu = smp_processor_id();
if (idle_cpu(cpu) && !in_interrupt())
tick_nohz_stop_idle(cpu);
#endif
__irq_enter();
#ifdef CONFIG_NO_HZ
if (idle_cpu(smp_processor_id()))
if (idle_cpu(cpu))
tick_nohz_update_jiffies();
#endif
}