[RFC,09/16,v3] Define and allocate a per CPU local cpumask for Workload Consolidation

Commit Message

Yuyang Du May 30, 2014, 6:36 a.m. UTC

We need these cpumasks to aid in cosolidated load balancing

Signed-off-by: Yuyang Du <[e-mail]>
---
 kernel/sched/fair.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Comments

Peter Zijlstra June 3, 2014, 12:15 p.m. UTC | #1

On Fri, May 30, 2014 at 02:36:05PM +0800, Yuyang Du wrote:
> We need these cpumasks to aid in cosolidated load balancing
> 

That's an entirely unsatisfactory changelog. Why would you need these?

Patch

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 96d6f64..5755746 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6638,6 +6638,8 @@  out:
 	return ld_moved;
 }
 
+static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
+
 /*
  * idle_balance is called by schedule() if this_cpu is about to become
  * idle. Attempts to pull tasks from other CPUs.
@@ -7692,6 +7694,12 @@  void print_cfs_stats(struct seq_file *m, int cpu)
 __init void init_sched_fair_class(void)
 {
 #ifdef CONFIG_SMP
+	unsigned int i;
+	for_each_possible_cpu(i) {
+		zalloc_cpumask_var_node(&per_cpu(local_cpu_mask, i),
+					GFP_KERNEL, cpu_to_node(i));
+	}
+
 	open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);
 
 #ifdef CONFIG_NO_HZ_COMMON