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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-04 17:36:58 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-04 17:36:58 +0200 |
| commit | 148086bb64694cc91624bab2a550d50f800eb4b7 (patch) | |
| tree | 77e208ccee6fc97c608f6d827e2605345bf3b20d /kernel | |
| parent | Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/ker... (diff) | |
| parent | sched: Fix rebalance interval calculation (diff) | |
| download | linux-148086bb64694cc91624bab2a550d50f800eb4b7.tar.xz linux-148086bb64694cc91624bab2a550d50f800eb4b7.zip | |
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched: Fix rebalance interval calculation
sched, doc: Beef up load balancing description
sched: Leave sched_setscheduler() earlier if possible, do not disturb SCHED_FIFO tasks
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 11 | ||||
| -rw-r--r-- | kernel/sched_fair.c | 5 |
2 files changed, 14 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index f592ce6f8616..a8845516ace6 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -5011,6 +5011,17 @@ recheck: return -EINVAL; } + /* + * If not changing anything there's no need to proceed further: + */ + if (unlikely(policy == p->policy && (!rt_policy(policy) || + param->sched_priority == p->rt_priority))) { + + __task_rq_unlock(rq); + raw_spin_unlock_irqrestore(&p->pi_lock, flags); + return 0; + } + #ifdef CONFIG_RT_GROUP_SCHED if (user) { /* diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 3f7ec9e27ee1..c7ec5c8e7b44 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -22,6 +22,7 @@ #include <linux/latencytop.h> #include <linux/sched.h> +#include <linux/cpumask.h> /* * Targeted preemption latency for CPU-bound tasks: @@ -3850,8 +3851,8 @@ static void rebalance_domains(int cpu, enum cpu_idle_type idle) interval = msecs_to_jiffies(interval); if (unlikely(!interval)) interval = 1; - if (interval > HZ*NR_CPUS/10) - interval = HZ*NR_CPUS/10; + if (interval > HZ*num_online_cpus()/10) + interval = HZ*num_online_cpus()/10; need_serialize = sd->flags & SD_SERIALIZE; |