Re: [PATCH 13/13] sched: Account for the number of preferred tasksrunning on a node when selecting a preferred node
From: Peter Zijlstra
Date: Thu Jul 04 2013 - 10:07:05 EST
On Thu, Jul 04, 2013 at 02:54:15PM +0100, Mel Gorman wrote:
>
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>
index 9247345..387f28d 100644
>
--- a/kernel/sched/fair.c
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+++ b/kernel/sched/fair.c
>
@@ -863,9 +863,13 @@ find_idlest_cpu_node(int this_cpu, int nid)
>
load = weighted_cpuload(i);
>
>
if (load < min_load) {
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- /* Do not preempt a task running on a preferred node */
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+ /*
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+ * Do not preempt a task running on a preferred node or
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+ * tasks are are pinned to their current CPU
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+ */
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struct task_struct *p = cpu_rq(i)->curr;
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- if (p->numa_preferred_nid != nid) {
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+ if (p->numa_preferred_nid != nid &&
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+ cpumask_weight(tsk_cpus_allowed(p)) > 1) {
We have p->nr_cpus_allowed for that.
>
min_load = load;
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idlest_cpu = i;
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}
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