- Pass the priority argument from *sleep() into sleepq and down into

   sched_sleep().  This removes extra thread_lock() acquisition and
   allows the scheduler to decide what to do with the static boost.
 - Change the priority arguments to cv_* to match sleepq/msleep/etc.
   where 0 means no priority change.  Catch -1 in cv_broadcastpri() and
   convert it to 0 for now.
 - Set a flag when sleeping in a way that is compatible with swapping
   since direct priority comparisons are meaningless now.
 - Add a sysctl to ule, kern.sched.static_boost, that defaults to on which
   controls the boost behavior.  Turning it off gives better performance
   in some workloads but needs more investigation.
 - While we're modifying sleepq, change signal and broadcast to both
   return with the lock held as the lock was held on enter.

Reviewed by:	jhb, peter

1 files changed, 1 insertions, 2 deletions

diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c
index 258b886..2a0b516 100644
--- a/sys/vm/vm_glue.c
+++ b/sys/vm/vm_glue.c
@@ -917,8 +917,7 @@ retry:
 				 * This could be refined to support
 				 * swapping out a thread.
 				 */
-				if ((td->td_priority) < PSOCK ||
-				    !thread_safetoswapout(td)) {
+				if (!thread_safetoswapout(td)) {
 					thread_unlock(td);
 					goto nextproc;
 				}