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authorIngo Molnar <mingo@elte.hu>2008-03-19 01:42:00 +0100
committerIngo Molnar <mingo@elte.hu>2008-03-19 04:27:53 +0100
commit4ae7d5cefd4aa3560e359a3b0f03e12adc8b5c86 (patch)
treec7517529ec199d3d9936b4049880a820534d2703 /kernel/sched_debug.c
parent6f3d09291b4982991680b61763b2541e53e2a95f (diff)
downloadop-kernel-dev-4ae7d5cefd4aa3560e359a3b0f03e12adc8b5c86.zip
op-kernel-dev-4ae7d5cefd4aa3560e359a3b0f03e12adc8b5c86.tar.gz
sched: improve affine wakeups
improve affine wakeups. Maintain the 'overlap' metric based on CFS's sum_exec_runtime - which means the amount of time a task executes after it wakes up some other task. Use the 'overlap' for the wakeup decisions: if the 'overlap' is short, it means there's strong workload coupling between this task and the woken up task. If the 'overlap' is large then the workload is decoupled and the scheduler will move them to separate CPUs more easily. ( Also slightly move the preempt_check within try_to_wake_up() - this has no effect on functionality but allows 'early wakeups' (for still-on-rq tasks) to be correctly accounted as well.) Signed-off-by: Ingo Molnar <mingo@elte.hu>
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 4b5e24c..ef358ba 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -288,6 +288,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
PN(se.exec_start);
PN(se.vruntime);
PN(se.sum_exec_runtime);
+ PN(se.avg_overlap);
nr_switches = p->nvcsw + p->nivcsw;
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