Commit-ID: bea2de44ae647698dc848a671fdee6e53c192423
Gitweb: http://git.kernel.org/tip/bea2de44ae647698dc848a671fdee6e53c192423
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 28 Jan 2016 20:30:06 -0800
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 31 Mar 2016 13:34:06 -0700
rcu: Add funnel-locking tracing for expedited grace periods
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/tree.c | 31 +++++++++++++++++++++++++++----
kernel/rcu/tree_plugin.h | 3 +++
2 files changed, 30 insertions(+), 4 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 178575c..79e9206 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3584,10 +3584,18 @@ static bool sync_exp_work_done(struct rcu_state *rsp, struct rcu_node *rnp,
atomic_long_t *stat, unsigned long s)
{
if (rcu_exp_gp_seq_done(rsp, s)) {
- if (rnp)
+ if (rnp) {
mutex_unlock(&rnp->exp_funnel_mutex);
- else if (rdp)
+ trace_rcu_exp_funnel_lock(rsp->name, rnp->level,
+ rnp->grplo, rnp->grphi,
+ TPS("rel"));
+ } else if (rdp) {
mutex_unlock(&rdp->exp_funnel_mutex);
+ trace_rcu_exp_funnel_lock(rsp->name,
+ rdp->mynode->level + 1,
+ rdp->cpu, rdp->cpu,
+ TPS("rel"));
+ }
/* Ensure test happens before caller kfree(). */
smp_mb__before_atomic(); /* ^^^ */
atomic_long_inc(stat);
@@ -3619,6 +3627,9 @@ static struct rcu_node *exp_funnel_lock(struct rcu_state *rsp, unsigned long s)
if (sync_exp_work_done(rsp, rnp0, NULL,
&rdp->expedited_workdone0, s))
return NULL;
+ trace_rcu_exp_funnel_lock(rsp->name, rnp0->level,
+ rnp0->grplo, rnp0->grphi,
+ TPS("acq"));
return rnp0;
}
}
@@ -3634,16 +3645,28 @@ static struct rcu_node *exp_funnel_lock(struct rcu_state *rsp, unsigned long s)
if (sync_exp_work_done(rsp, NULL, NULL, &rdp->expedited_workdone1, s))
return NULL;
mutex_lock(&rdp->exp_funnel_mutex);
+ trace_rcu_exp_funnel_lock(rsp->name, rdp->mynode->level + 1,
+ rdp->cpu, rdp->cpu, TPS("acq"));
rnp0 = rdp->mynode;
for (; rnp0 != NULL; rnp0 = rnp0->parent) {
if (sync_exp_work_done(rsp, rnp1, rdp,
&rdp->expedited_workdone2, s))
return NULL;
mutex_lock(&rnp0->exp_funnel_mutex);
- if (rnp1)
+ trace_rcu_exp_funnel_lock(rsp->name, rnp0->level,
+ rnp0->grplo, rnp0->grphi, TPS("acq"));
+ if (rnp1) {
mutex_unlock(&rnp1->exp_funnel_mutex);
- else
+ trace_rcu_exp_funnel_lock(rsp->name, rnp1->level,
+ rnp1->grplo, rnp1->grphi,
+ TPS("rel"));
+ } else {
mutex_unlock(&rdp->exp_funnel_mutex);
+ trace_rcu_exp_funnel_lock(rsp->name,
+ rdp->mynode->level + 1,
+ rdp->cpu, rdp->cpu,
+ TPS("rel"));
+ }
rnp1 = rnp0;
}
if (sync_exp_work_done(rsp, rnp1, rdp,
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index a2ac262..cd2dae4 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -767,6 +767,9 @@ void synchronize_rcu_expedited(void)
/* Clean up and exit. */
rcu_exp_gp_seq_end(rsp);
mutex_unlock(&rnp_unlock->exp_funnel_mutex);
+ trace_rcu_exp_funnel_lock(rsp->name, rnp_unlock->level,
+ rnp_unlock->grplo, rnp_unlock->grphi,
+ TPS("rel"));
}
EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
--
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