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authorDiwakar Tundlam <dtundlam@nvidia.com>2012-03-07 14:44:26 -0800
committerIngo Molnar <mingo@elte.hu>2012-03-12 20:43:16 +0100
commit554cecaf733623b327eef9652b65965eb1081b81 (patch)
tree4e471c4689563d3a882667323ece2e581d8f17c8 /kernel/sched/fair.c
parent5fbd036b552f633abb394a319f7c62a5c86a9cd7 (diff)
sched/nohz: Correctly initialize 'next_balance' in 'nohz' idle balancer
The 'next_balance' field of 'nohz' idle balancer must be initialized to jiffies. Since jiffies is initialized to negative 300 seconds the 'nohz' idle balancer does not run for the first 300s (5mins) after bootup. If no new processes are spawed or no idle cycles happen, the load on the cpus will remain unbalanced for that duration. Signed-off-by: Diwakar Tundlam <dtundlam@nvidia.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1DD7BFEDD3147247B1355BEFEFE4665237994F30EF@HQMAIL04.nvidia.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched/fair.c')
-rw-r--r--kernel/sched/fair.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index def17aa302d..11f3979bad2 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5571,6 +5571,7 @@ __init void init_sched_fair_class(void)
open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);
#ifdef CONFIG_NO_HZ
+ nohz.next_balance = jiffies;
zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
cpu_notifier(sched_ilb_notifier, 0);
#endif