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Allow scheduling during early boot.

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- Send IPI wakeups once SMP is started even if cold is true.
- Permit preemptions when cold is true.

These changes are needed for EARLY_AP_STARTUP.

MFC after:	2 weeks
Sponsored by:	Netflix
This commit is contained in:
John Baldwin 2016-11-12 00:23:09 +00:00
parent a6b91f0f45
commit 892f0ab0ab
1 changed files with 2 additions and 3 deletions
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5
sys/kern/sched_4bsd.c
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@ -326,7 +326,6 @@ maybe_preempt(struct thread *td)
* - The current thread has a higher (numerically lower) or
* equivalent priority. Note that this prevents curthread from
* trying to preempt to itself.
* - It is too early in the boot for context switches (cold is set).
* - The current thread has an inhibitor set or is in the process of
* exiting. In this case, the current thread is about to switch
* out anyways, so there's no point in preempting. If we did,
@ -347,7 +346,7 @@ maybe_preempt(struct thread *td)
("maybe_preempt: trying to run inhibited thread"));
pri = td->td_priority;
cpri = ctd->td_priority;
if (panicstr != NULL || pri >= cpri || cold /* || dumping */ ||
if (panicstr != NULL || pri >= cpri /* || dumping */ ||
TD_IS_INHIBITED(ctd))
return (0);
#ifndef FULL_PREEMPTION
@ -1105,7 +1104,7 @@ forward_wakeup(int cpunum)
if ((!forward_wakeup_enabled) ||
(forward_wakeup_use_mask == 0 && forward_wakeup_use_loop == 0))
return (0);
if (!smp_started || cold || panicstr)
if (!smp_started || panicstr)
return (0);
forward_wakeups_requested++;