clocksource: Enable TSC watchdog checking of HPET and PMTMR only when requested

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Unconditionally enabling TSC watchdog checking of the HPET and PMTMR
clocksources can degrade latency and performance.  Therefore, provide
a new "watchdog" option to the tsc= boot parameter that opts into such
checking.  Note that tsc=watchdog is overridden by a tsc=nowatchdog
regardless of their relative positions in the list of boot parameters.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Waiman Long <longman@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>

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Paul E. McKenney 2023-02-01 13:53:07 -08:00

parent efc8b329c7

commit 0051293c53

2 changed files with 22 additions and 2 deletions

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6

Documentation/admin-guide/kernel-parameters.txt

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18

arch/x86/kernel/tsc.c

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