documentation: Long-running irq handlers can stall RCU grace periods

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If a periodic interrupt's handler takes longer to execute than the period
between successive interrupts, RCU's kthreads and softirq handlers can
be prevented from executing, resulting in otherwise inexplicable RCU
CPU stall warnings.  This commit therefore calls out this possibility
in Documentation/RCU/stallwarn.txt.

Reported-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Paul E. McKenney 2017-08-09 10:16:29 -07:00

parent bb7e5ce7dd

commit dfa0ee48ef

1 changed files with 11 additions and 1 deletions

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Documentation/RCU/stallwarn.txt

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