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rcu: Add GP-kthread-starvation checks to CPU stall warnings

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This commit adds a message that is printed if the relevant grace-period
kthread has not been able to run for the two seconds preceding the
stall warning.  (The two seconds is double the maximum interval between
successive bouts of quiescent-state forcing.)

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2014-12-17 08:35:02 -08:00
parent 5cd37193ce
commit fb81a44b88
2 changed files with 29 additions and 1 deletions
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9
Documentation/RCU/stallwarn.txt
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@@ -152,6 +152,15 @@ no non-lazy callbacks ("." is printed otherwise, as shown above) and
"D" indicates that dyntick-idle processing is enabled ("." is printed
otherwise, for example, if disabled via the "nohz=" kernel boot parameter).
If the relevant grace-period kthread has been unable to run prior to
the stall warning, the following additional line is printed:
rcu_preempt kthread starved for 2023 jiffies!
Starving the grace-period kthreads of CPU time can of course result in
RCU CPU stall warnings even when all CPUs and tasks have passed through
the required quiescent states.
Multiple Warnings From One Stall