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authorPeter Zijlstra <peterz@infradead.org>2009-09-16 12:31:31 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-17 10:17:25 +0200
commitad4b78bbcbab66998b05d422ac6106b645796e54 (patch)
tree45f3561f4bd6b886948a3b0eea64edab9bab9eda /include/linux/sched.h
parenteb24073bc1fe3e569a855cf38d529fb650c35524 (diff)
downloadop-kernel-dev-ad4b78bbcbab66998b05d422ac6106b645796e54.zip
op-kernel-dev-ad4b78bbcbab66998b05d422ac6106b645796e54.tar.gz
sched: Add new wakeup preemption mode: WAKEUP_RUNNING
Create a new wakeup preemption mode, preempt towards tasks that run shorter on avg. It sets next buddy to be sure we actually run the task we preempted for. Test results: root@twins:~# while :; do :; done & [1] 6537 root@twins:~# while :; do :; done & [2] 6538 root@twins:~# while :; do :; done & [3] 6539 root@twins:~# while :; do :; done & [4] 6540 root@twins:/home/peter# ./latt -c4 sleep 4 Entries: 48 (clients=4) Averages: ------------------------------ Max 4750 usec Avg 497 usec Stdev 737 usec root@twins:/home/peter# echo WAKEUP_RUNNING > /debug/sched_features root@twins:/home/peter# ./latt -c4 sleep 4 Entries: 48 (clients=4) Averages: ------------------------------ Max 14 usec Avg 5 usec Stdev 3 usec Disabled by default - needs more testing. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> LKML-Reference: <new-submission>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b4a39bb..8af3d24 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1113,6 +1113,8 @@ struct sched_entity {
u64 start_runtime;
u64 avg_wakeup;
+ u64 avg_running;
+
#ifdef CONFIG_SCHEDSTATS
u64 wait_start;
u64 wait_max;
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