summaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2015-07-07 16:43:04 +0200
committerThomas Gleixner <tglx@linutronix.de>2015-07-07 18:46:48 +0200
commitd5113e13a550bc9c2b53cc9944b8a06453c4a0a1 (patch)
tree56fa1b52407e6dfe931d8968a5be2209b998cd81 /kernel
parent0cc5281aa592d0020868f6ccaed359b4ad7b2684 (diff)
downloadlwn-d5113e13a550bc9c2b53cc9944b8a06453c4a0a1.tar.gz
lwn-d5113e13a550bc9c2b53cc9944b8a06453c4a0a1.zip
tick/broadcast: Check for hrtimer broadcast active early
If the current cpu is the one which has the hrtimer based broadcast queued then we better return busy immediately instead of going through loops and hoops to figure that out. [ Split out from a larger combo patch ] Tested-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Suzuki Poulose <Suzuki.Poulose@arm.com> Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com> Cc: Catalin Marinas <Catalin.Marinas@arm.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1507070929360.3916@nanos
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-broadcast.c36
1 files changed, 26 insertions, 10 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 70b47bc928b9..c8d731ac9563 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -706,6 +706,17 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
if (state == TICK_BROADCAST_ENTER) {
/*
+ * If the current CPU owns the hrtimer broadcast
+ * mechanism, it cannot go deep idle and we do not add
+ * the CPU to the broadcast mask. We don't have to go
+ * through the EXIT path as the local timer is not
+ * shutdown.
+ */
+ ret = broadcast_needs_cpu(bc, cpu);
+ if (ret)
+ goto out;
+
+ /*
* If the broadcast device is in periodic mode, we
* return.
*/
@@ -718,7 +729,10 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_oneshot_mask)) {
WARN_ON_ONCE(cpumask_test_cpu(cpu, tick_broadcast_pending_mask));
+
+ /* Conditionally shut down the local timer. */
broadcast_shutdown_local(bc, dev);
+
/*
* We only reprogram the broadcast timer if we
* did not mark ourself in the force mask and
@@ -733,18 +747,20 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
ret = -EBUSY;
} else if (dev->next_event.tv64 < bc->next_event.tv64) {
tick_broadcast_set_event(bc, cpu, dev->next_event);
+ /*
+ * In case of hrtimer broadcasts the
+ * programming might have moved the
+ * timer to this cpu. If yes, remove
+ * us from the broadcast mask and
+ * return busy.
+ */
+ ret = broadcast_needs_cpu(bc, cpu);
+ if (ret) {
+ cpumask_clear_cpu(cpu,
+ tick_broadcast_oneshot_mask);
+ }
}
}
- /*
- * If the current CPU owns the hrtimer broadcast
- * mechanism, it cannot go deep idle and we remove the
- * CPU from the broadcast mask. We don't have to go
- * through the EXIT path as the local timer is not
- * shutdown.
- */
- ret = broadcast_needs_cpu(bc, cpu);
- if (ret)
- cpumask_clear_cpu(cpu, tick_broadcast_oneshot_mask);
} else {
if (cpumask_test_and_clear_cpu(cpu, tick_broadcast_oneshot_mask)) {
clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT);