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a382bf9344
linux/kernel/time
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Frederic Weisbecker a382bf9344 nohz: Assign timekeeping duty to a CPU outside the full dynticks range 
This way the full nohz CPUs can safely run with the tick
stopped with a guarantee that somebody else is taking
care of the jiffies and GTOD progression.

Once the duty is attributed to a CPU, it won't change. Also that
CPU can't enter into dyntick idle mode or be hot unplugged.

This may later be improved from a power consumption POV. At
least we should be able to share the duty amongst all CPUs
outside the full dynticks range. Then the duty could even be
shared with full dynticks CPUs when those can't stop their
tick for any reason.

But let's start with that very simple approach first.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
[fix have_nohz_full_mask offcase]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2013-03-21 15:55:45 +01:00
..
alarmtimer.c alarmtimer: Rename alarmtimer_remove to alarmtimer_dequeue 2012-09-24 12:38:03 -04:00
clockevents.c clockevents: export clockevents_config_and_register for module use 2013-01-14 10:12:37 -08:00
clocksource.c kernel-time: fix s/then/than/ spelling errors 2012-03-23 16:49:21 -07:00
jiffies.c time: Kill xtime_lock, replacing it with jiffies_lock 2012-11-13 14:08:23 -05:00
Kconfig nohz: Basic full dynticks interface 2013-03-21 15:38:33 +01:00
Makefile time: remove the timecompare code. 2012-11-01 11:41:35 -04:00
ntp.c Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-22 19:25:09 -08:00
posix-clock.c kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure 2011-10-31 19:30:05 -04:00
tick-broadcast.c nohz: Assign timekeeping duty to a CPU outside the full dynticks range 2013-03-21 15:55:45 +01:00
tick-common.c nohz: Assign timekeeping duty to a CPU outside the full dynticks range 2013-03-21 15:55:45 +01:00
tick-internal.h time: Kill xtime_lock, replacing it with jiffies_lock 2012-11-13 14:08:23 -05:00
tick-oneshot.c clockevents: Make minimum delay adjustments configurable 2011-09-08 11:10:56 +02:00
tick-sched.c nohz: Assign timekeeping duty to a CPU outside the full dynticks range 2013-03-21 15:55:45 +01:00
timeconv.c
timekeeping.c arm-soc: cleanups 2013-02-21 14:58:40 -08:00
timer_list.c nohz: Rename ts->idle_tick to ts->last_tick 2012-06-11 20:07:17 +02:00
timer_stats.c locking, timer_stats: Annotate table_lock as raw 2011-09-13 11:12:00 +02:00