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- When choosing a thread on the run queue, check to see if its nice is

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outside of the nice threshold due to a recently awoken thread with a
   lower nice value.  This further reduces the amount of time a positively
   niced thread gets while running in conjunction with a workload that has
   many short sleeps (ie buildworld).
This commit is contained in:
Jeff Roberson 2004-10-30 12:19:15 +00:00
parent ab5c14d828
commit 0516c8dd4a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=137067
1 changed files with 4 additions and 2 deletions
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6
sys/kern/sched_ule.c
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@ -867,8 +867,9 @@ kseq_transfer(struct kseq *kseq, struct kse *ke, int class)
static struct kse *
kseq_choose(struct kseq *kseq)
{
struct kse *ke;
struct runq *swap;
struct kse *ke;
int nice;
mtx_assert(&sched_lock, MA_OWNED);
swap = NULL;
@ -891,7 +892,8 @@ kseq_choose(struct kseq *kseq)
* TIMESHARE kse group and its nice was too far out
* of the range that receives slices.
*/
if (ke->ke_slice == 0) {
nice = ke->ke_proc->p_nice + (0 - kseq->ksq_nicemin);
if (ke->ke_slice == 0 || nice > SCHED_SLICE_NTHRESH) {
runq_remove(ke->ke_runq, ke);
sched_slice(ke);
ke->ke_runq = kseq->ksq_next;