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Commit aa7b630e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: 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 615cd033

arch/x86/kernel/tsc.c

+5 −0
Original line number Diff line number Diff line
@@ -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;