sched: Kill WAKEUP_PREEMPT
Remove the WAKEUP_PREEMPT feature, disabling it doesn't make any sense
and its outlived its use by a long long while.
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Acked-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110729082033.GB12106@zhy
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index bc8ee99..241fc86 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1095,9 +1095,6 @@
* narrow margin doesn't have to wait for a full slice.
* This also mitigates buddy induced latencies under load.
*/
- if (!sched_feat(WAKEUP_PREEMPT))
- return;
-
if (delta_exec < sysctl_sched_min_granularity)
return;
@@ -1233,7 +1230,7 @@
return;
#endif
- if (cfs_rq->nr_running > 1 || !sched_feat(WAKEUP_PREEMPT))
+ if (cfs_rq->nr_running > 1)
check_preempt_tick(cfs_rq, curr);
}
@@ -1899,10 +1896,6 @@
if (unlikely(p->policy != SCHED_NORMAL))
return;
-
- if (!sched_feat(WAKEUP_PREEMPT))
- return;
-
find_matching_se(&se, &pse);
update_curr(cfs_rq_of(se));
BUG_ON(!pse);
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 2e74677..efa0a7b 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -12,11 +12,6 @@
SCHED_FEAT(START_DEBIT, 1)
/*
- * Should wakeups try to preempt running tasks.
- */
-SCHED_FEAT(WAKEUP_PREEMPT, 1)
-
-/*
* Based on load and program behaviour, see if it makes sense to place
* a newly woken task on the same cpu as the task that woke it --
* improve cache locality. Typically used with SYNC wakeups as