Thomas Gleixner 868a3e915f hrtimer: Make offset update smarter ...

On every tick/hrtimer interrupt we update the offset variables of the
clock bases. That's silly because these offsets change very seldom.

Add a sequence counter to the time keeping code which keeps track of
the offset updates (clock_was_set()). Have a sequence cache in the
hrtimer cpu bases to evaluate whether the offsets must be updated or
not. This allows us later to avoid pointless cacheline pollution.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20150414203501.132820245@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>

2015-04-22 17:06:49 +02:00

..

alarmtimer.c

hrtimer: Get rid of hrtimer_get_res()

2015-04-22 17:06:49 +02:00

clockevents.c

clockevents: Cleanup dead cpu explicitely

2015-04-03 08:44:37 +02:00

clocksource.c

clocksource: Improve comment explaining clocks_calc_max_nsecs()'s 50% safety margin

2015-04-03 08:18:35 +02:00

hrtimer.c

hrtimer: Make offset update smarter

2015-04-22 17:06:49 +02:00

itimer.c

time/timers: Move all time(r) related files into kernel/time

2014-06-23 11:22:35 +02:00

jiffies.c

tick: Move clocksource related stuff to timekeeping.h

2015-04-01 14:22:58 +02:00

Kconfig

clockevents: Remove CONFIG_GENERIC_CLOCKEVENTS_BUILD

2015-04-01 14:22:57 +02:00

Makefile

clockevents: Remove CONFIG_GENERIC_CLOCKEVENTS_BUILD

2015-04-01 14:22:57 +02:00

ntp_internal.h

timekeeping: Convert timekeeping core to use timespec64s

2014-07-23 10:17:54 -07:00

ntp.c

time: Add y2038 safe update_persistent_clock64()

2015-04-03 08:18:20 +02:00

posix-clock.c

kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure

2011-10-31 19:30:05 -04:00

posix-cpu-timers.c

all arches, signal: move restart_block to struct task_struct

2015-02-12 18:54:12 -08:00

posix-timers.c

hrtimer: Get rid of hrtimer_get_res()

2015-04-22 17:06:49 +02:00

sched_clock.c

timers, sched/clock: Clean up the code a bit

2015-03-27 08:34:01 +01:00

test_udelay.c

time: Rename udelay_test.c to test_udelay.c

2014-11-21 11:59:55 -08:00

tick-broadcast-hrtimer.c

timers/tick/broadcast-hrtimer: Fix suspicious RCU usage in idle loop

2015-03-23 10:50:05 +01:00

tick-broadcast.c

clockevents: Cleanup dead cpu explicitely

2015-04-03 08:44:37 +02:00

tick-common.c

timers/PM: Drop unnecessary braces from tick_freeze()

2015-04-03 15:15:52 +02:00

tick-internal.h

clockevents: Cleanup dead cpu explicitely

2015-04-03 08:44:37 +02:00

tick-oneshot.c

clockevents: Manage device's state separately for the core

2015-03-27 10:26:19 +01:00

tick-sched.c

tick: Move core only declarations and functions to core

2015-04-01 14:22:58 +02:00

tick-sched.h

arm/bL_switcher: Kill tick suspend hackery

2015-04-01 14:23:00 +02:00

time.c

Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-01-25 17:47:34 -08:00

timeconst.bc

time/timers: Move all time(r) related files into kernel/time

2014-06-23 11:22:35 +02:00

timeconv.c

time: add function to convert between calendar time and broken-down time for universal use

2009-09-24 07:20:56 -07:00

timecounter.c

timecounter: keep track of accumulated fractional nanoseconds

2014-12-30 18:29:27 -05:00

timekeeping_debug.c

timekeeping: Convert timekeeping core to use timespec64s

2014-07-23 10:17:54 -07:00

timekeeping_internal.h

clocksource: Move cycle_last validation to core code

2014-07-23 15:01:51 -07:00

timekeeping.c

hrtimer: Make offset update smarter

2015-04-22 17:06:49 +02:00

timekeeping.h

hrtimer: Make offset update smarter

2015-04-22 17:06:49 +02:00

timer_list.c

hrtimer: Make the statistics fields smaller

2015-04-22 17:06:49 +02:00

timer_stats.c

timer stats: Add a 'Collection: active/inactive' line to timer usage statistics

2013-10-10 09:59:25 +02:00

timer.c

timer: Further simplify the SMP and HOTPLUG logic

2015-04-02 17:46:21 +02:00