sched: Remove avg_wakeup

Testing the load which led to this heuristic (nfs4 kbuild) shows that it has
outlived it's usefullness.  With intervening load balancing changes, I cannot
see any difference with/without, so recover there fastpath cycles.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301062.6785.29.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 31 deletions

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 8ad164bbdac1..6fc62854422c 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1592,42 +1592,11 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag
 }
 #endif /* CONFIG_SMP */
 
-/*
- * Adaptive granularity
- *
- * se->avg_wakeup gives the average time a task runs until it does a wakeup,
- * with the limit of wakeup_gran -- when it never does a wakeup.
- *
- * So the smaller avg_wakeup is the faster we want this task to preempt,
- * but we don't want to treat the preemptee unfairly and therefore allow it
- * to run for at least the amount of time we'd like to run.
- *
- * NOTE: we use 2*avg_wakeup to increase the probability of actually doing one
- *
- * NOTE: we use *nr_running to scale with load, this nicely matches the
- *       degrading latency on load.
- */
-static unsigned long
-adaptive_gran(struct sched_entity *curr, struct sched_entity *se)
-{
-        u64 this_run = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
-        u64 expected_wakeup = 2*se->avg_wakeup * cfs_rq_of(se)->nr_running;
-        u64 gran = 0;
-
-        if (this_run < expected_wakeup)
-                gran = expected_wakeup - this_run;
-
-        return min_t(s64, gran, sysctl_sched_wakeup_granularity);
-}
-
 static unsigned long
 wakeup_gran(struct sched_entity *curr, struct sched_entity *se)
 {
         unsigned long gran = sysctl_sched_wakeup_granularity;
 
-        if (cfs_rq_of(curr)->curr && sched_feat(ADAPTIVE_GRAN))
-                gran = adaptive_gran(curr, se);
-
         /*
          * Since its curr running now, convert the gran from real-time
          * to virtual-time in his units.