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Message-ID: <20080522131026.GA16156@Krystal>
Date: Thu, 22 May 2008 09:10:26 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To: Paul McKenney <paulmck@...ibm.com>
Cc: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [RFC PATCH] Markers Use RCU sched
rcu_barrier_sched and call_rcu_sched has been introduced in 2.6.26 for the
Markers. Change the marker code to use them.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Paul McKenney <paulmck@...ibm.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
---
kernel/marker.c | 25 ++++++++-----------------
1 file changed, 8 insertions(+), 17 deletions(-)
Index: linux-2.6-sched-devel/kernel/marker.c
===================================================================
--- linux-2.6-sched-devel.orig/kernel/marker.c 2008-05-22 05:33:07.000000000 -0400
+++ linux-2.6-sched-devel/kernel/marker.c 2008-05-22 05:35:45.000000000 -0400
@@ -442,7 +442,7 @@
hlist_del(&e->hlist);
/* Make sure the call_rcu has been executed */
if (e->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
kfree(e);
return 0;
}
@@ -477,7 +477,7 @@
hlist_del(&(*entry)->hlist);
/* Make sure the call_rcu has been executed */
if ((*entry)->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
kfree(*entry);
*entry = e;
trace_mark(core_marker_format, "name %s format %s",
@@ -659,7 +659,7 @@
* make sure it's executed now.
*/
if (entry->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
old = marker_entry_add_probe(entry, probe, probe_private);
if (IS_ERR(old)) {
ret = PTR_ERR(old);
@@ -674,10 +674,7 @@
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
- synchronize_sched(); /* Until we have the call_rcu_sched() */
-#endif
- call_rcu(&entry->rcu, free_old_closure);
+ call_rcu_sched(&entry->rcu, free_old_closure);
end:
mutex_unlock(&markers_mutex);
return ret;
@@ -708,7 +705,7 @@
if (!entry)
goto end;
if (entry->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
old = marker_entry_remove_probe(entry, probe, probe_private);
mutex_unlock(&markers_mutex);
marker_update_probes(); /* may update entry */
@@ -720,10 +717,7 @@
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
- synchronize_sched(); /* Until we have the call_rcu_sched() */
-#endif
- call_rcu(&entry->rcu, free_old_closure);
+ call_rcu_sched(&entry->rcu, free_old_closure);
remove_marker(name); /* Ignore busy error message */
ret = 0;
end:
@@ -790,7 +784,7 @@
goto end;
}
if (entry->rcu_pending)
- rcu_barrier();
+ rcu_barrier_sched();
old = marker_entry_remove_probe(entry, NULL, probe_private);
mutex_unlock(&markers_mutex);
marker_update_probes(); /* may update entry */
@@ -801,10 +795,7 @@
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
smp_wmb();
-#ifdef CONFIG_PREEMPT_RCU
- synchronize_sched(); /* Until we have the call_rcu_sched() */
-#endif
- call_rcu(&entry->rcu, free_old_closure);
+ call_rcu_sched(&entry->rcu, free_old_closure);
remove_marker(entry->name); /* Ignore busy error message */
end:
mutex_unlock(&markers_mutex);
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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