sched/balancing: Periodically decay max cost of idle balance

This patch builds on patch 2 and periodically decays that max value to
do idle balancing per sched domain by approximately 1% per second. Also
decay the rq's max_idle_balance_cost value.

Signed-off-by: Jason Low <jason.low2@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1379096813-3032-4-git-send-email-jason.low2@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/topology.h b/include/linux/topology.h
index e2a2c3da2929..12ae6ce997d6 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -107,6 +107,7 @@ int arch_update_cpu_topology(void);
         .balance_interval       = 1,                                    \
         .smt_gain               = 1178, /* 15% */                       \
         .max_newidle_lb_cost    = 0,                                    \
+        .next_decay_max_lb_cost = jiffies,                              \
 }
 #endif
 #endif /* CONFIG_SCHED_SMT */
@@ -137,6 +138,7 @@ int arch_update_cpu_topology(void);
         .last_balance           = jiffies,                              \
         .balance_interval       = 1,                                    \
         .max_newidle_lb_cost    = 0,                                    \
+        .next_decay_max_lb_cost = jiffies,                              \
 }
 #endif
 #endif /* CONFIG_SCHED_MC */
@@ -169,6 +171,7 @@ int arch_update_cpu_topology(void);
         .last_balance           = jiffies,                              \
         .balance_interval       = 1,                                    \
         .max_newidle_lb_cost    = 0,                                    \
+        .next_decay_max_lb_cost = jiffies,                              \
 }
 #endif