Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c18a17329b3389315e8a138d998b217077509c13
Commit: c18a17329b3389315e8a138d998b217077509c13
Parent: f2ac58ee617fd9f6cd9922fbcd291b661d7c9954
Author: Ingo Molnar <[EMAIL PROTECTED]>
AuthorDate: Mon Jul 9 18:51:59 2007 +0200
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Mon Jul 9 18:51:59 2007 +0200
sched: remove expired_starving()
remove the expired_starving() heuristics from the core scheduler.
CFS does not need it, and this did not really work well in practice
anyway, due to the rq->nr_running multiplier to STARVATION_LIMIT.
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
kernel/sched.c | 23 +----------------------
1 files changed, 1 insertions(+), 22 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 26795ad..8e44da6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3241,27 +3241,6 @@ unsigned long long task_sched_runtime(struct task_struct
*p)
}
/*
- * We place interactive tasks back into the active array, if possible.
- *
- * To guarantee that this does not starve expired tasks we ignore the
- * interactivity of a task if the first expired task had to wait more
- * than a 'reasonable' amount of time. This deadline timeout is
- * load-dependent, as the frequency of array switched decreases with
- * increasing number of running tasks. We also ignore the interactivity
- * if a better static_prio task has expired:
- */
-static inline int expired_starving(struct rq *rq)
-{
- if (rq->curr->static_prio > rq->best_expired_prio)
- return 1;
- if (!STARVATION_LIMIT || !rq->expired_timestamp)
- return 0;
- if (jiffies - rq->expired_timestamp > STARVATION_LIMIT * rq->nr_running)
- return 1;
- return 0;
-}
-
-/*
* Account user cpu time to a process.
* @p: the process that the cpu time gets accounted to
* @hardirq_offset: the offset to subtract from hardirq_count()
@@ -3373,7 +3352,7 @@ static void task_running_tick(struct rq *rq, struct
task_struct *p)
if (!rq->expired_timestamp)
rq->expired_timestamp = jiffies;
- if (!TASK_INTERACTIVE(p) || expired_starving(rq)) {
+ if (!TASK_INTERACTIVE(p)) {
enqueue_task(p, rq->expired);
if (p->static_prio < rq->best_expired_prio)
rq->best_expired_prio = p->static_prio;
-
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