rcu: Dump rcuc kthread status for CPUs not reporting quiescent state

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If the rcutree.use_softirq kernel boot parameter is disabled, then it is
possible that a RCU CPU stall is due to the rcuc kthreads being starved of
CPU time.  There is currently no easy way to infer this from the RCU CPU
stall warning output.  This commit therefore adds a string of the form "
rcuc=%ld jiffies(starved)" to a given CPU's output if the corresponding
rcuc kthread has been starved for more than two seconds.

[ paulmck: Eliminate extraneous space characters. ]

Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Zqiang 2022-04-25 09:04:04 +08:00 • committed by Paul E. McKenney

parent a111daf0c5

commit 245a629825

1 changed files with 21 additions and 28 deletions

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49

kernel/rcu/tree_stall.h

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