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authorVenkatesh Pallipadi <venki@google.com>2010-10-04 17:03:22 -0700
committerIngo Molnar <mingo@elte.hu>2010-10-18 20:52:27 +0200
commitaa483808516ca5cacfa0e5849691f64fec25828e (patch)
tree38a1d9f1cb1157bd68dc2475447bacbb4b63c64a /kernel/sched_features.h
parent305e6835e05513406fa12820e40e4a8ecb63743c (diff)
sched: Remove irq time from available CPU power
The idea was suggested by Peter Zijlstra here: http://marc.info/?l=linux-kernel&m=127476934517534&w=2 irq time is technically not available to the tasks running on the CPU. This patch removes irq time from CPU power piggybacking on sched_rt_avg_update(). Tested this by keeping CPU X busy with a network intensive task having 75% oa a single CPU irq processing (hard+soft) on a 4-way system. And start seven cycle soakers on the system. Without this change, there will be two tasks on each CPU. With this change, there is a single task on irq busy CPU X and remaining 7 tasks are spread around among other 3 CPUs. Signed-off-by: Venkatesh Pallipadi <venki@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1286237003-12406-8-git-send-email-venki@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_features.h')
-rw-r--r--kernel/sched_features.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 83c66e8ad3e..185f920ec1a 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -61,3 +61,8 @@ SCHED_FEAT(ASYM_EFF_LOAD, 1)
* release the lock. Decreases scheduling overhead.
*/
SCHED_FEAT(OWNER_SPIN, 1)
+
+/*
+ * Decrement CPU power based on irq activity
+ */
+SCHED_FEAT(NONIRQ_POWER, 1)