diff options
Diffstat (limited to 'sys/kern/sched_4bsd.c')
| -rw-r--r-- | sys/kern/sched_4bsd.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c index 02c8f3c..a88e266 100644 --- a/sys/kern/sched_4bsd.c +++ b/sys/kern/sched_4bsd.c @@ -792,6 +792,12 @@ sched_switch(struct thread *td, struct thread *newtd, int flags) /* * The thread we are about to run needs to be counted as if it had been * added to the run queue and selected. + * it came from: + * A preemption + * An upcall + * A followon + * Do this before saving curthread so that the slot count + * doesn't give an overly optimistic view when that happens. */ if (newtd) { KASSERT((newtd->td_inhibitors == 0), @@ -1024,6 +1030,7 @@ sched_add(struct thread *td, int flags) } if ((td->td_proc->p_flag & P_NOLOAD) == 0) sched_tdcnt++; + td->td_ksegrp->kg_avail_opennings--; runq_add(ke->ke_runq, ke); ke->ke_ksegrp->kg_runq_kses++; ke->ke_state = KES_ONRUNQ; @@ -1044,12 +1051,17 @@ sched_rem(struct thread *td) if ((td->td_proc->p_flag & P_NOLOAD) == 0) sched_tdcnt--; + td->td_ksegrp->kg_avail_opennings++; runq_remove(ke->ke_runq, ke); ke->ke_state = KES_THREAD; - ke->ke_ksegrp->kg_runq_kses--; + td->td_ksegrp->kg_runq_kses--; } +/* + * Select threads to run. + * Notice that the running threads still consume a slot. + */ struct kse * sched_choose(void) { |
