linux-sg2042/kernel/time
Venki Pallipadi 6378ddb592 time: track accurate idle time with tick_sched.idle_sleeptime
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 <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30 13:30:04 +01:00
..
Kconfig clockevents: Allow build w/o run-tine usage for migration purposes 2007-10-12 23:04:05 +02:00
Makefile clockevents: Allow build w/o run-tine usage for migration purposes 2007-10-12 23:04:05 +02:00
clockevents.c x86: make clockevents more robust 2008-01-30 13:30:03 +01:00
clocksource.c clocksource: add unregister function to disable unusable clocksources 2008-01-30 13:30:02 +01:00
jiffies.c [PATCH] fix jiffies clocksource inittime 2007-04-04 21:12:47 -07:00
ntp.c time: add ADJ_OFFSET_SS_READ 2007-11-26 20:42:19 +01:00
tick-broadcast.c timer: clean up tick-broadcast.c 2008-01-30 13:30:01 +01:00
tick-common.c clockevents: introduce force broadcast notifier 2007-10-14 22:57:45 +02:00
tick-internal.h timer: clean up tick-broadcast.c 2008-01-30 13:30:01 +01:00
tick-oneshot.c highres: improve debug output 2007-07-21 17:49:15 -07:00
tick-sched.c time: track accurate idle time with tick_sched.idle_sleeptime 2008-01-30 13:30:04 +01:00
timekeeping.c NTP: correct inconsistent ntp interval/tick_length usage 2008-01-30 13:30:03 +01:00
timer_list.c timer_list: Fix printk format strings 2007-10-29 09:39:38 +01:00
timer_stats.c time: more timer related cleanups 2008-01-30 13:30:00 +01:00