Messages in this thread Patch in this message | | | From | Gregory Haskins <> | Subject | [PATCH 3/7] RT: Only consider online CPUs when pushing rt tasks | Date | Thu, 11 Oct 2007 17:59:59 -0400 |
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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()) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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