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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched 

* git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched:
  sched: default to more agressive yield for SCHED_BATCH tasks
  sched: fix crash in sys_sched_rr_get_interval()
This commit is contained in:
Linus Torvalds 2007-12-04 09:28:23 -08:00
parent 220821028c db292ca302
commit 98f20fb6a9
2 changed files with 13 additions and 8 deletions
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14
kernel/sched.c
View File

@ -4850,17 +4850,21 @@ long sys_sched_rr_get_interval(pid_t pid, struct timespec __user *interval)
if (retval)
goto out_unlock;
if (p->policy == SCHED_FIFO)
time_slice = 0;
else if (p->policy == SCHED_RR)
/*
* Time slice is 0 for SCHED_FIFO tasks and for SCHED_OTHER
* tasks that are on an otherwise idle runqueue:
*/
time_slice = 0;
if (p->policy == SCHED_RR) {
time_slice = DEF_TIMESLICE;
else {
} else {
struct sched_entity *se = &p->se;
unsigned long flags;
struct rq *rq;
rq = task_rq_lock(p, &flags);
time_slice = NS_TO_JIFFIES(sched_slice(cfs_rq_of(se), se));
if (rq->cfs.load.weight)
time_slice = NS_TO_JIFFIES(sched_slice(&rq->cfs, se));
task_rq_unlock(rq, &flags);
}
read_unlock(&tasklist_lock);

7
kernel/sched_fair.c
View File

@ -799,8 +799,9 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep)
*/
static void yield_task_fair(struct rq *rq)
{
struct cfs_rq *cfs_rq = task_cfs_rq(rq->curr);
struct sched_entity *rightmost, *se = &rq->curr->se;
struct task_struct *curr = rq->curr;
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
struct sched_entity *rightmost, *se = &curr->se;
/*
* Are we the only task in the tree?
@ -808,7 +809,7 @@ static void yield_task_fair(struct rq *rq)
if (unlikely(cfs_rq->nr_running == 1))
return;
if (likely(!sysctl_sched_compat_yield)) {
if (likely(!sysctl_sched_compat_yield) && curr->policy != SCHED_BATCH) {
__update_rq_clock(rq);
/*
* Update run-time statistics of the 'current'.