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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 /kernel/sched_debug.c
parenteb24073bc1fe3e569a855cf38d529fb650c35524 (diff)
downloadlinux-ad4b78bbcbab66998b05d422ac6106b645796e54.tar.bz2
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 'kernel/sched_debug.c')
-rw-r--r--kernel/sched_debug.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 5ddbd0891267..efb84409bc43 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -395,6 +395,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
PN(se.sum_exec_runtime);
PN(se.avg_overlap);
PN(se.avg_wakeup);
+ PN(se.avg_running);
nr_switches = p->nvcsw + p->nivcsw;