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rcu: Update documentation to flag RCU_BOOST trace information

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Call out the RCU_TRACE information that is provided only in kernels
built with RCU_BOOST.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-06-15 23:07:55 -07:00 committed by Paul E. McKenney
parent 1eb521210a
commit d5988af531
1 changed files with 4 additions and 0 deletions
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Documentation/RCU/trace.txt
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@ -184,10 +184,14 @@ o "kt" is the per-CPU kernel-thread state. The digit preceding
The number after the final slash is the CPU that the kthread The number after the final slash is the CPU that the kthread
is actually running on. is actually running on.
This field is displayed only for CONFIG_RCU_BOOST kernels.
o "ktl" is the low-order 16 bits (in hexadecimal) of the count of o "ktl" is the low-order 16 bits (in hexadecimal) of the count of
the number of times that this CPU's per-CPU kthread has gone the number of times that this CPU's per-CPU kthread has gone
through its loop servicing invoke_rcu_cpu_kthread() requests. through its loop servicing invoke_rcu_cpu_kthread() requests.
This field is displayed only for CONFIG_RCU_BOOST kernels.
o "b" is the batch limit for this CPU. If more than this number o "b" is the batch limit for this CPU. If more than this number
of RCU callbacks is ready to invoke, then the remainder will of RCU callbacks is ready to invoke, then the remainder will
be deferred. be deferred.