watchdog/softlockup: Replace "watchdog/%u" threads with cpu_stop_work

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Oleg suggested to replace the "watchdog/%u" threads with
cpu_stop_work. That removes one thread per CPU while at the same time
fixes softlockup vs SCHED_DEADLINE.

But more importantly, it does away with the single
smpboot_update_cpumask_percpu_thread() user, which allows
cleanups/shrinkage of the smpboot interface.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
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 2018-06-07 10:52:03 +02:00 • committed by Ingo Molnar

parent 4520843dfa

commit 9cf57731b6

4 changed files with 71 additions and 77 deletions

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1

include/linux/cpuhotplug.h

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5

include/linux/nmi.h

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5

kernel/cpu.c

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145

kernel/watchdog.c

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