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Code Issues Releases Activity

- Fix an error that occurs when mp_ncpu is an odd number. steal_thresh

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is calculated as 0 which causes errors elsewhere.

Submitted by:	KOIE Hidetaka <koie@suri.co.jp>

 - When sched_affinity() is called with a thread that is not curthread we
   need to handle the ON_RUNQ() case by adding the thread to the correct
   run queue.

Submitted by:	Justin Teller <justin.teller@gmail.com>

MFC after:	1 Week
This commit is contained in:
Jeff Roberson 2009-03-14 11:41:36 +00:00
parent 3b2dc2ac52
commit 53a6c8b3ac
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=189787
1 changed files with 9 additions and 4 deletions
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13
sys/kern/sched_ule.c
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@ -1337,11 +1337,11 @@ sched_initticks(void *dummy)
*/
balance_interval = realstathz;
/*
* Set steal thresh to log2(mp_ncpu) but no greater than 4. This
* prevents excess thrashing on large machines and excess idle on
* smaller machines.
* Set steal thresh to roughly log2(mp_ncpu) but no greater than 4.
* This prevents excess thrashing on large machines and excess idle
* on smaller machines.
*/
steal_thresh = min(ffs(mp_ncpus) - 1, 3);
steal_thresh = min(fls(mp_ncpus) - 1, 3);
affinity = SCHED_AFFINITY_DEFAULT;
#endif
}
@ -2417,6 +2417,11 @@ sched_affinity(struct thread *td)
ts = td->td_sched;
if (THREAD_CAN_SCHED(td, ts->ts_cpu))
return;
if (TD_ON_RUNQ(td)) {
sched_rem(td);
sched_add(td, SRQ_BORING);
return;
}
if (!TD_IS_RUNNING(td))
return;
td->td_flags |= TDF_NEEDRESCHED;