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Subject[PATCH 3/7] RT: Only consider online CPUs when pushing rt tasks
Date
task->cpus_allowed can have bit positions that are set for CPUs that are
not currently online. So we optimze our search by ANDing against the online
set.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
---
kernel/sched.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 24b38b4..0ca3905 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1510,10 +1510,14 @@ static int push_rt_task(struct rq *this_rq)

/* Only try this algorithm three times */
for (tries = 0; tries < 3; tries++) {
+ cpumask_t mask;
+
+ cpus_and(mask, cpu_online_map, next_task->cpus_allowed);
+
/*
* Scan each rq for the lowest prio.
*/
- for_each_cpu_mask(cpu, next_task->cpus_allowed) {
+ for_each_cpu_mask(cpu, mask) {
struct rq *rq = &per_cpu(runqueues, cpu);

if (cpu == smp_processor_id())
-
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