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rcu: Separate accounting of callbacks from callback-free CPUs

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Currently, callback invocations from callback-free CPUs are accounted to
the CPU that registered the callback, but using the same field that is
used for normal callbacks.  This makes it impossible to determine from
debugfs output whether callbacks are in fact being diverted.  This commit
therefore adds a separate ->n_nocbs_invoked field in the rcu_data structure
in which diverted callback invocations are counted.  RCU's debugfs tracing
still displays normal callback invocations using ci=, but displayed
diverted callbacks with nci=.

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
2012-10-29 07:29:20 -07:00
committed by Paul E. McKenney
parent 3fbfbf7a3b
commit c635a4e1c2
3 changed files with 5 additions and 3 deletions
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2
kernel/rcutree_plugin.h
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@@ -2406,7 +2406,7 @@ static int rcu_nocb_kthread(void *arg)
trace_rcu_batch_end(rdp->rsp->name, c, !!list, 0, 0, 1);
ACCESS_ONCE(rdp->nocb_p_count) -= c;
ACCESS_ONCE(rdp->nocb_p_count_lazy) -= cl;
rdp->n_cbs_invoked += c;
rdp->n_nocbs_invoked += c;
}
return 0;
}