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| author | Dmitry Adamushko <dmitry.adamushko@gmail.com> | 2007-10-15 17:00:13 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:13 +0200 |
| commit | a4ec24b48ddef1e93f7578be53270f0b95ad666c (patch) | |
| tree | cad14ba03ec8647761396e23e693328c5db40991 /kernel/sched_rt.c | |
| parent | a9957449b08ab561a33e1e038df06843b8d8dd9f (diff) | |
sched: tidy up SCHED_RR
- make timeslices of SCHED_RR tasks constant and not
dependent on task's static_prio [1] ;
- remove obsolete code (timeslice related bits);
- make sched_rr_get_interval() return something more
meaningful [2] for SCHED_OTHER tasks.
[1] according to the following link, it's not compliant with SUSv3
(not sure though, what is the reference for us :-)
http://lkml.org/lkml/2007/3/7/656
[2] the interval is dynamic and can be depicted as follows "should a
task be one of the runnable tasks at this particular moment, it would
expect to run for this interval of time before being re-scheduled by the
scheduler tick".
(i.e. it's more precise if a task is runnable at the moment)
yeah, this seems to require task_rq_lock/unlock() but this is not a hot
path.
results:
(SCHED_FIFO)
dimm@earth:~/storage/prog$ sudo chrt -f 10 ./rr_interval
time_slice: 0 : 0
(SCHED_RR)
dimm@earth:~/storage/prog$ sudo chrt 10 ./rr_interval
time_slice: 0 : 99984800
(SCHED_NORMAL)
dimm@earth:~/storage/prog$ ./rr_interval
time_slice: 0 : 19996960
(SCHED_NORMAL + a cpu_hog of similar 'weight' on the same CPU --- so should be a half of the previous result)
dimm@earth:~/storage/prog$ taskset 1 ./rr_interval
time_slice: 0 : 9998480
Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_rt.c')
| -rw-r--r-- | kernel/sched_rt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index 2f26c3d73506..d0097a0634e5 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -206,7 +206,7 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p) if (--p->time_slice) return; - p->time_slice = static_prio_timeslice(p->static_prio); + p->time_slice = DEF_TIMESLICE; /* * Requeue to the end of queue if we are not the only element |