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Run softclock threads at a hardware ithread priority.

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Add a new PI_SOFTCLOCK for use by softclock threads.  Currently this
maps to PI_AV which is the second-highest ithread priority.

Reviewed by:	mav, kib
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D33693
This commit is contained in:
John Baldwin 2022-04-21 10:40:01 -07:00
parent 1ac10fa429
commit c7aa0304d5
2 changed files with 2 additions and 1 deletions
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2
sys/kern/kern_timeout.c
View file

@ -393,7 +393,7 @@ start_softclock(void *dummy)
cc->cc_thread = td;
thread_lock(td);
sched_class(td, PRI_ITHD);
sched_prio(td, PI_SWI(SWI_CLOCK));
sched_prio(td, PI_SOFTCLOCK);
TD_SET_IWAIT(td);
thread_lock_set(td, (struct mtx *)&cc->cc_lock);
thread_unlock(td);

1
sys/sys/priority.h
View file

@ -87,6 +87,7 @@
#define PI_REALTIME (PRI_MIN_ITHD + 0)
#define PI_AV (PRI_MIN_ITHD + 4)
#define PI_SOFTCLOCK PI_AV
#define PI_NET (PRI_MIN_ITHD + 8)
#define PI_DISK (PRI_MIN_ITHD + 12)
#define PI_TTY (PRI_MIN_ITHD + 16)