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x86/tsc: Feed refined TSC calibration into sched_clock() 

For the (older) CPUs that still need the refined TSC calibration, also
update the sched_clock() rate.

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>
This commit is contained in:
Peter Zijlstra 2017-04-21 11:32:46 +02:00 committed by Ingo Molnar
parent 615cd03373
commit aa7b630ea0
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/tsc.c
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@ -1161,6 +1161,7 @@ static void tsc_refine_calibration_work(struct work_struct *work)
static int hpet;
u64 tsc_stop, ref_stop, delta;
unsigned long freq;
int cpu;
/* Don't bother refining TSC on unstable systems */
if (check_tsc_unstable())
@ -1211,6 +1212,10 @@ static void tsc_refine_calibration_work(struct work_struct *work)
/* Inform the TSC deadline clockevent devices about the recalibration */
lapic_update_tsc_freq();
/* Update the sched_clock() rate to match the clocksource one */
for_each_possible_cpu(cpu)
__set_cyc2ns_scale(tsc_khz, cpu, tsc_stop);
out:
if (boot_cpu_has(X86_FEATURE_ART))
art_related_clocksource = &clocksource_tsc;