Peter Zijlstra
b421b22b00
x86/tsc, sched/clock, clocksource: Use clocksource watchdog to provide stable sync points ...
Currently we keep sched_clock_tick() active for stable TSC in order to
keep the per-CPU state semi up-to-date. The (obvious) problem is that
by the time we detect TSC is borked, our per-CPU state is also borked.
So hook into the clocksource watchdog and call a method after we've
found it to still be stable.
There's the obvious race where the TSC goes wonky between finding it
stable and us running the callback, but closing that is too much work
and not really worth it, since we're already detecting TSC wobbles
after the fact, so we cannot, per definition, fully avoid funny clock
values.
And since the watchdog runs less often than the tick, this is also an
optimization.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-05-15 10:15:18 +02:00
time: Change k_clock nsleep() to use timespec64
2017-04-14 21:49:56 +02:00
clockevents: Make clockevents_config() static
2017-03-23 12:14:05 -07:00
x86/tsc, sched/clock, clocksource: Use clocksource watchdog to provide stable sync points
2017-05-15 10:15:18 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2017-05-02 19:09:35 -07:00
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
jiffies: Revert bogus conversion of NSEC_PER_SEC to TICK_NSEC
2017-03-07 11:03:28 +01:00
time: Remove CONFIG_TIMER_STATS
2017-02-10 11:15:08 +01:00
ktime: Get rid of the union
2016-12-25 17:21:22 +01:00
time: Change k_clock timer_set() and timer_get() to use timespec64
2017-04-14 21:49:56 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2017-05-05 11:08:43 -07:00
time: Change k_clock nsleep() to use timespec64
2017-04-14 21:49:56 +02:00
time: Change k_clock nsleep() to use timespec64
2017-04-14 21:49:56 +02:00
timers, sched_clock: Update timeout for clock wrap
2017-03-23 12:30:27 -07:00
time: Avoid timespec in udelay_test
2016-06-20 12:47:26 -07:00
ktime: Get rid of the union
2016-12-25 17:21:22 +01:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-02-20 10:06:32 -08:00
ktime: Cleanup ktime_set() usage
2016-12-25 17:21:22 +01:00
timers: Forward the wheel clock whenever possible
2016-07-07 10:35:11 +02:00
ktime: Get rid of the union
2016-12-25 17:21:22 +01:00
cpufreq: schedutil: Avoid reducing frequency of busy CPUs prematurely
2017-03-23 02:12:14 +01:00
Revert "nohz: Fix collision between tick and other hrtimers"
2017-02-16 12:19:18 -08:00
time: delete current_fs_time()
2017-05-12 15:57:15 -07:00
time: Introduce jiffies64_to_nsecs()
2017-02-01 09:13:45 +01:00
time: Add time64_to_tm()
2016-06-20 12:47:15 -07:00
clocksource: Use a plain u64 instead of cycle_t
2016-12-25 11:04:12 +01:00
timekeeping: Remove pointless conversion to bool
2017-03-31 10:26:56 +02:00
timekeeping: Remove unused timekeeping_{get,set}_tai_offset()
2017-01-06 16:47:28 -08:00
timekeeping: Use deferred printk() in debug code
2017-02-15 11:46:08 +01:00
clocksource: Use a plain u64 instead of cycle_t
2016-12-25 11:04:12 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2017-05-02 19:09:35 -07:00
sysrq: Reset the watchdog timers while displaying high-resolution timers
2017-03-23 12:46:53 -07:00
b421b22b00