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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-02-27 12:00:46 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-03-07 16:43:00 +0100 |
| commit | 2692a2406b9262bbb101708815be99ec2988e48b (patch) | |
| tree | 5f956c6f28e7e83f5a1c57e2724b1739da25da30 | |
| parent | sched: fix the wrong time slice value for SCHED_FIFO tasks (diff) | |
| download | linux-2692a2406b9262bbb101708815be99ec2988e48b.tar.xz linux-2692a2406b9262bbb101708815be99ec2988e48b.zip | |
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>
| -rw-r--r-- | kernel/sched.c | 10 |
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); |