Commit b421b22b authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent cf15ca8d

arch/x86/kernel/tsc.c

+10 −0
Original line number Diff line number Diff line
@@ -1033,6 +1033,15 @@ static void tsc_cs_mark_unstable(struct clocksource *cs) 
	pr_info("Marking TSC unstable due to clocksource watchdog\n");

}



static void tsc_cs_tick_stable(struct clocksource *cs)

{

	if (tsc_unstable)

		return;



	if (using_native_sched_clock())

		sched_clock_tick_stable();

}



/*

 * .mask MUST be CLOCKSOURCE_MASK(64). See comment above read_tsc()

 */
@@ -1046,6 +1055,7 @@ static struct clocksource clocksource_tsc = { 
	.archdata               = { .vclock_mode = VCLOCK_TSC },

	.resume			= tsc_resume,

	.mark_unstable		= tsc_cs_mark_unstable,

	.tick_stable		= tsc_cs_tick_stable,

};



void mark_tsc_unstable(char *reason)

include/linux/clocksource.h

+1 −0
Original line number Diff line number Diff line
@@ -96,6 +96,7 @@ struct clocksource { 
	void (*suspend)(struct clocksource *cs);

	void (*resume)(struct clocksource *cs);

	void (*mark_unstable)(struct clocksource *cs);

	void (*tick_stable)(struct clocksource *cs);



	/* private: */

#ifdef CONFIG_CLOCKSOURCE_WATCHDOG

include/linux/sched/clock.h

+1 −1
Original line number Diff line number Diff line
@@ -63,8 +63,8 @@ extern void clear_sched_clock_stable(void); 
 */

extern u64 __sched_clock_offset;





extern void sched_clock_tick(void);

extern void sched_clock_tick_stable(void);

extern void sched_clock_idle_sleep_event(void);

extern void sched_clock_idle_wakeup_event(u64 delta_ns);

kernel/sched/clock.c

+27 −9
Original line number Diff line number Diff line
@@ -366,22 +366,40 @@ void sched_clock_tick(void) 
{

	struct sched_clock_data *scd;



	if (sched_clock_stable())

		return;



	if (unlikely(!sched_clock_running))

		return;



	WARN_ON_ONCE(!irqs_disabled());



	/*

	 * Update these values even if sched_clock_stable(), because it can

	 * become unstable at any point in time at which point we need some

	 * values to fall back on.

	 *

	 * XXX arguably we can skip this if we expose tsc_clocksource_reliable

	 */

	scd = this_scd();

	__scd_stamp(scd);



	if (!sched_clock_stable() && likely(sched_clock_running))

	sched_clock_local(scd);

}



void sched_clock_tick_stable(void)

{

	u64 gtod, clock;



	if (!sched_clock_stable())

		return;



	/*

	 * Called under watchdog_lock.

	 *

	 * The watchdog just found this TSC to (still) be stable, so now is a

	 * good moment to update our __gtod_offset. Because once we find the

	 * TSC to be unstable, any computation will be computing crap.

	 */

	local_irq_disable();

	gtod = ktime_get_ns();

	clock = sched_clock();

	__gtod_offset = (clock + __sched_clock_offset) - gtod;

	local_irq_enable();

}



/*

 * We are going deep-idle (irqs are disabled):

 */

kernel/time/clocksource.c

+3 −0
Original line number Diff line number Diff line
@@ -233,6 +233,9 @@ static void clocksource_watchdog(unsigned long data) 
			continue;

		}



		if (cs == curr_clocksource && cs->tick_stable)

			cs->tick_stable(cs);



		if (!(cs->flags & CLOCK_SOURCE_VALID_FOR_HRES) &&

		    (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS) &&

		    (watchdog->flags & CLOCK_SOURCE_IS_CONTINUOUS)) {

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