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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-02-27 12:00:46 +0100
committerIngo Molnar <mingo@elte.hu>2008-03-07 16:43:00 +0100
commit2692a2406b9262bbb101708815be99ec2988e48b (patch)
tree5f956c6f28e7e83f5a1c57e2724b1739da25da30 /kernel
parent1868f958eb56fc41c5985c8732e564a400c5fdf5 (diff)
sched: rt-group: fixup schedulability constraints calculation
it was only possible to configure the rt-group scheduling parameters beyond the default value in a very small range. that's because div64_64() has a different calling convention than do_div() :/ fix a few untidies while we are here; sysctl_sched_rt_period may overflow due to that multiplication, so cast to u64 first. Also that RUNTIME_INF juggling makes little sense although its an effective NOP. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 5b13e4b0e009..b8ee864c7481 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7726,9 +7726,7 @@ static unsigned long to_ratio(u64 period, u64 runtime)
if (runtime == RUNTIME_INF)
return 1ULL << 16;
- runtime *= (1ULL << 16);
- div64_64(runtime, period);
- return runtime;
+ return div64_64(runtime << 16, period);
}
static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
@@ -7757,18 +7755,16 @@ int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us)
u64 rt_runtime, rt_period;
int err = 0;
- rt_period = sysctl_sched_rt_period * NSEC_PER_USEC;
+ rt_period = (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
rt_runtime = (u64)rt_runtime_us * NSEC_PER_USEC;
if (rt_runtime_us == -1)
- rt_runtime = rt_period;
+ rt_runtime = RUNTIME_INF;
mutex_lock(&rt_constraints_mutex);
if (!__rt_schedulable(tg, rt_period, rt_runtime)) {
err = -EINVAL;
goto unlock;
}
- if (rt_runtime_us == -1)
- rt_runtime = RUNTIME_INF;
tg->rt_runtime = rt_runtime;
unlock:
mutex_unlock(&rt_constraints_mutex);

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