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| author | Venkatesh Pallipadi <venki@google.com> | 2010-10-04 17:03:22 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-10-18 20:52:27 +0200 |
| commit | aa483808516ca5cacfa0e5849691f64fec25828e (patch) | |
| tree | 38a1d9f1cb1157bd68dc2475447bacbb4b63c64a /kernel/sched_features.h | |
| parent | 305e6835e05513406fa12820e40e4a8ecb63743c (diff) | |
| download | linux-aa483808516ca5cacfa0e5849691f64fec25828e.tar.gz linux-aa483808516ca5cacfa0e5849691f64fec25828e.tar.bz2 linux-aa483808516ca5cacfa0e5849691f64fec25828e.zip | |
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.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 83c66e8ad3ee..185f920ec1a2 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) |