Author: jeff
Date: Mon Mar 30 19:20:56 2009
New Revision: 190570
URL: http://svn.freebsd.org/changeset/base/190570
Log:
MFC SVN rev 189787.
- Fix steal_thresh calculation with odd numbers of cpus and sched_affinity()
for threads on runqueues.
Approved by: re
Modified:
stable/7/sys/kern/sched_ule.c
Modified: stable/7/sys/kern/sched_ule.c
==============================================================================
--- stable/7/sys/kern/sched_ule.c Mon Mar 30 18:47:13 2009
(r190569)
+++ stable/7/sys/kern/sched_ule.c Mon Mar 30 19:20:56 2009
(r190570)
@@ -1395,11 +1395,11 @@ 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, 4);
+ steal_thresh = min(fls(mp_ncpus) - 1, 3);
affinity = SCHED_AFFINITY_DEFAULT;
#endif
}
@@ -2549,6 +2549,11 @@ 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;
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