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authorPaul E. McKenney <paul.mckenney@linaro.org>2013-02-08 15:55:02 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-03-26 08:04:46 -0700
commit09c7b890622d72b5e004cc249bbe610e8b928ddf (patch)
tree4326a3d6baaebaeb3417f0593bb017c2477b973b /kernel/rcutree_plugin.h
parent21e7a6087480451804124cee27c0a7d0a7de1564 (diff)
rcu: Add event tracing for no-CBs CPUs' grace periods
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree_plugin.h')
-rw-r--r--kernel/rcutree_plugin.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 7225a5a14cef..e32236e83dda 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2201,6 +2201,9 @@ static int rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
wake_up_all(&rnp->nocb_gp_wq[c & 0x1]);
rnp->n_nocb_gp_requests[c & 0x1] = 0;
needmore = rnp->n_nocb_gp_requests[(c + 1) & 0x1];
+ trace_rcu_nocb_grace_period(rsp->name, rnp->gpnum, rnp->completed,
+ c, rnp->level, rnp->grplo, rnp->grphi,
+ needmore ? "CleanupMore" : "Cleanup");
return needmore;
}
@@ -2347,6 +2350,9 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
/* Count our request for a grace period. */
rnp->n_nocb_gp_requests[c & 0x1]++;
+ trace_rcu_nocb_grace_period(rdp->rsp->name, rnp->gpnum, rnp->completed,
+ c, rnp->level, rnp->grplo, rnp->grphi,
+ "Startleaf");
if (rnp->gpnum != rnp->completed) {
@@ -2355,6 +2361,10 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
* is in progress, so we are done. When this grace
* period ends, our request will be acted upon.
*/
+ trace_rcu_nocb_grace_period(rdp->rsp->name,
+ rnp->gpnum, rnp->completed, c,
+ rnp->level, rnp->grplo, rnp->grphi,
+ "Startedleaf");
raw_spin_unlock_irqrestore(&rnp->lock, flags);
} else {
@@ -2366,6 +2376,11 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
if (rnp != rnp_root)
raw_spin_lock(&rnp_root->lock); /* irqs disabled. */
if (rnp_root->gpnum != rnp_root->completed) {
+ trace_rcu_nocb_grace_period(rdp->rsp->name,
+ rnp->gpnum, rnp->completed,
+ c, rnp->level,
+ rnp->grplo, rnp->grphi,
+ "Startedleafroot");
raw_spin_unlock(&rnp_root->lock); /* irqs disabled. */
} else {
@@ -2381,6 +2396,11 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
c = rnp_root->completed + 1;
rnp->n_nocb_gp_requests[c & 0x1]++;
rnp_root->n_nocb_gp_requests[c & 0x1]++;
+ trace_rcu_nocb_grace_period(rdp->rsp->name,
+ rnp->gpnum, rnp->completed,
+ c, rnp->level,
+ rnp->grplo, rnp->grphi,
+ "Startedroot");
local_save_flags(flags1);
rcu_start_gp(rdp->rsp, flags1); /* Rlses ->lock. */
}
@@ -2396,6 +2416,9 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
* Wait for the grace period. Do so interruptibly to avoid messing
* up the load average.
*/
+ trace_rcu_nocb_grace_period(rdp->rsp->name, rnp->gpnum, rnp->completed,
+ c, rnp->level, rnp->grplo, rnp->grphi,
+ "StartWait");
for (;;) {
wait_event_interruptible(
rnp->nocb_gp_wq[c & 0x1],
@@ -2403,7 +2426,14 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
if (likely(d))
break;
flush_signals(current);
+ trace_rcu_nocb_grace_period(rdp->rsp->name,
+ rnp->gpnum, rnp->completed, c,
+ rnp->level, rnp->grplo, rnp->grphi,
+ "ResumeWait");
}
+ trace_rcu_nocb_grace_period(rdp->rsp->name, rnp->gpnum, rnp->completed,
+ c, rnp->level, rnp->grplo, rnp->grphi,
+ "EndWait");
smp_mb(); /* Ensure that CB invocation happens after GP end. */
}