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rcu/nocb: Rename and document no-CB CB kthread sleep trace event

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The nocb_cb_wait() function traces a "FollowerSleep" trace_rcu_nocb_wake()
event, which never was documented and is now misleading.  This commit
therefore changes "FollowerSleep" to "CBSleep", documents this, and
updates the documentation for "Sleep" as well.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney
2019-04-01 09:57:01 -07:00
parent 0bdc33daef
commit f7c9a9b664
2 changed files with 3 additions and 2 deletions
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2
kernel/rcu/tree_plugin.h
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@@ -1891,7 +1891,7 @@ static int rcu_nocb_gp_kthread(void *arg)
*/
static bool nocb_cb_wait(struct rcu_data *rdp)
{
trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("FollowerSleep"));
trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("CBSleep"));
swait_event_interruptible_exclusive(rdp->nocb_cb_wq,
READ_ONCE(rdp->nocb_cb_head));
if (smp_load_acquire(&rdp->nocb_cb_head)) { /* VVV */