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Temporarily disable nice threshold detection code, as it can starve

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a thread holding critical resource, e.g mutex or other implicit
synchronous flags. Give thread which exceeds nice threshold a minimum
time slice.

PR: kern/86087
This commit is contained in:
David Xu 2005-09-22 01:19:37 +00:00
parent 44dbf79b0c
commit a861574011
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=150442
1 changed files with 3 additions and 1 deletions
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4
sys/kern/sched_ule.c
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@ -886,6 +886,7 @@ kseq_choose(struct kseq *kseq)
* of the range that receives slices.
*/
nice = ke->ke_proc->p_nice + (0 - kseq->ksq_nicemin);
#if 0
if (ke->ke_slice == 0 || (nice > SCHED_SLICE_NTHRESH &&
ke->ke_proc->p_nice != 0)) {
runq_remove(ke->ke_runq, ke);
@ -894,6 +895,7 @@ kseq_choose(struct kseq *kseq)
runq_add(ke->ke_runq, ke, 0);
continue;
}
#endif
return (ke);
}
@ -1088,7 +1090,7 @@ sched_slice(struct kse *ke)
else if (kg->kg_proc->p_nice == 0)
ke->ke_slice = SCHED_SLICE_MIN;
else
ke->ke_slice = 0;
ke->ke_slice = SCHED_SLICE_MIN; /* 0 */
} else
ke->ke_slice = SCHED_SLICE_INTERACTIVE;