[PATCH] sched: balance timers
Do CPU load averaging over a number of different intervals. Allow each
interval to be chosen by sending a parameter to source_load and target_load.
0 is instantaneous, idx > 0 returns a decaying average with the most recent
sample weighted at 2^(idx-1). To a maximum of 3 (could be easily increased).
So generally a higher number will result in more conservative balancing.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2c69682..664981a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -488,6 +488,10 @@
unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
+ unsigned int busy_idx;
+ unsigned int idle_idx;
+ unsigned int newidle_idx;
+ unsigned int wake_idx;
int flags; /* See SD_* */
/* Runtime fields. */
diff --git a/include/linux/topology.h b/include/linux/topology.h
index d70e897..ae9c221 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -89,6 +89,10 @@
.cache_hot_time = 0, \
.cache_nice_tries = 0, \
.per_cpu_gain = 25, \
+ .busy_idx = 0, \
+ .idle_idx = 0, \
+ .newidle_idx = 0, \
+ .wake_idx = 0, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_NEWIDLE \
| SD_BALANCE_EXEC \
@@ -115,6 +119,10 @@
.cache_hot_time = (5*1000000/2), \
.cache_nice_tries = 1, \
.per_cpu_gain = 100, \
+ .busy_idx = 2, \
+ .idle_idx = 0, \
+ .newidle_idx = 1, \
+ .wake_idx = 1, \
.flags = SD_LOAD_BALANCE \
| SD_BALANCE_NEWIDLE \
| SD_BALANCE_EXEC \