rcu: Document failing tick as cause of RCU CPU stall warning
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Mon, 3 Oct 2011 00:21:18 +0000 (17:21 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Sun, 11 Dec 2011 18:31:26 +0000 (10:31 -0800)
commit2c01531f08f8ba663a20d8472a3032f6df133b6e
tree3a6c5ce1fc95258e5431968a0011f6e80f3c431e
parent91afaf300269aa99a4d646969b3258b74294ac4d
rcu: Document failing tick as cause of RCU CPU stall warning

One of lclaudio's systems was seeing RCU CPU stall warnings from idle.
These turned out to be caused by a bug that stopped scheduling-clock
tick interrupts from being sent to a given CPU for several hundred seconds.
This commit therefore updates the documentation to call this out as a
possible cause for RCU CPU stall warnings.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Documentation/RCU/stallwarn.txt