Thomas Gleixner 0cf6cbf5c2 tick: Upstream fixes ... * Addresses the issue of timers being scheduled on offline CPUs. tick: Don't invoke tick_nohz_stop_sched_tick() if the cpu is offline commit 5b39939a4 (nohz: Move ts->idle_calls incrementation into strict idle logic) moved code out of tick_nohz_stop_sched_tick() and missed to bail out when the cpu is offline. That's causing subsequent failures as an offline CPU is supposed to die and not to fiddle with nohz magic. Return false in can_stop_idle_tick() if the cpu is offline. Reported-and-tested-by: Jiri Kosina <jkosina@suse.cz> Reported-and-tested-by: Prarit Bhargava <prarit@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Cc: x86@kernel.org Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1305132138160.2863@ionos Signed-off-by: Thomas Gleixner <tglx@linutronix.de> timers: Consolidate base->next_timer update Another bunch of mindlessly copied code. All callers of internal_add_timer() except the recascading code updates base->next_timer. Move this into internal_add_timer() and let the cascading code call __internal_add_timer(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20120525214819.189946224@linutronix.de timers: Create detach_if_pending() and use it Most callers of detach_timer() have the same pattern around them. Check whether the timer is pending and eventually updating base->next_timer. Create detach_if_pending() and replace the duplicated code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20120525214819.131246037@linutronix.de timers: Add accounting of non deferrable timers The code in get_next_timer_interrupt() is suboptimal as it has to run through the cascade to find the next expiring timer. On a completely idle core we should only do that when there is an active timer enqueued and base->next_timer does not give us a fast answer. Add accounting of the active timers to the now consolidated attach/detach code. I deliberately avoided sanity checks because the code is fully symetric and any fiddling with timers w/o using the API functions will lead to cute explosions anyway. ulong is big enough even on 32bit and if we really run into the situation to have more than 1<<32 timers enqueued there, then we are definitely not in a state to go idle and run through that code. This allows us to fix another shortcoming of get_next_timer_interrupt(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20120525214819.236377028@linutronix.de timers: Improve get_next_timer_interrupt() Gilad reported at http://lkml.kernel.org/r/1336056962-10465-2-git-send-email-gilad@benyossef.com "Current timer code fails to correctly return a value meaning that there is no future timer event, with the result that the timer keeps getting re-armed in HZ one shot mode even when we could turn it off, generating unneeded interrupts. What is happening is that when __next_timer_interrupt() wishes to return a value that signifies "there is no future timer event", it returns (base->timer_jiffies + NEXT_TIMER_MAX_DELTA). However, the code in tick_nohz_stop_sched_tick(), which called __next_timer_interrupt() via get_next_timer_interrupt(), compares the return value to (last_jiffies + NEXT_TIMER_MAX_DELTA) to see if the timer needs to be re-armed. base->timer_jiffies != last_jiffies and so tick_nohz_stop_sched_tick() interperts the return value as indication that there is a distant future event 12 days from now and programs the timer to fire next after KTIME_MAX nsecs instead of avoiding to arm it. This ends up causing a needless interrupt once every KTIME_MAX nsecs." Fix this by using the new active timer accounting. This avoids scans when no active timer is enqueued completely, so we don't have to rely on base->timer_next and base->timer_jiffies anymore. Change-Id: I874ee5e5f837a228cebf5e6a084baf520d33cd0f Reported-by: Gilad Ben-Yossef <gilad@benyossef.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20120525214819.317535385@linutronix.de		2017-08-25 20:00:22 +03:00
..
alarmtimer.c	kernel: alarm: Increase power-on alarm before alarm time to 300 sec	2017-08-25 20:00:10 +03:00
clockevents.c	Revert "clockevents: Set noop handler in clockevents_exchange_device()"	2011-12-30 13:24:40 -08:00
clocksource.c	clocksource: Fix abs() usage w/ 64bit values	2017-08-25 20:00:11 +03:00
jiffies.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
Kconfig	tick: Document TICK_ONESHOT config option	2012-03-31 12:45:43 +02:00
Makefile	Revert "HACK: time: Disable alarmtimer"	2017-08-25 16:03:46 +03:00
ntp.c	time: Prevent early expiry of hrtimers[CLOCK_REALTIME] at the leap second edge	2017-08-25 20:00:21 +03:00
posix-clock.c	kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure	2011-10-31 19:30:05 -04:00
tick-broadcast.c	tick: Dynamically set broadcast irq affinity	2017-08-25 16:04:02 +03:00
tick-common.c	clockevents: Make minimum delay adjustments configurable	2011-09-08 11:10:56 +02:00
tick-internal.h	clockevents: Make minimum delay adjustments configurable	2011-09-08 11:10:56 +02:00
tick-oneshot.c	clockevents: Make minimum delay adjustments configurable	2011-09-08 11:10:56 +02:00
tick-sched.c	tick: Upstream fixes	2017-08-25 20:00:22 +03:00
timecompare.c	time: Use ARRAY_SIZE macro in timecompare.c	2010-10-21 17:30:06 +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
timekeeping.c	time: Prevent early expiry of hrtimers[CLOCK_REALTIME] at the leap second edge	2017-08-25 20:00:21 +03:00
timer_list.c	time: Remove CONFIG_TIMER_STATS	2017-07-02 13:03:26 +03:00