- Restore dropping the priority of syncer down to PPAUSE when it is idle.

  This was lost when it was converted to using a condition variable instead
  of lbolt.
- Drop the priority of flowtable down to PPAUSE when it is idle as well
  since it is a similar background task.

MFC after:	2 weeks

2 files changed, 12 insertions, 0 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 92030fd..fc413a2 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -65,6 +65,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/namei.h>
 #include <sys/priv.h>
 #include <sys/reboot.h>
+#include <sys/sched.h>
 #include <sys/sleepqueue.h>
 #include <sys/stat.h>
 #include <sys/sysctl.h>
@@ -1880,6 +1881,12 @@ sched_sync(void)
 		 * matter as we are just trying to generally pace the
 		 * filesystem activity.
 		 */
+		if (syncer_state != SYNCER_RUNNING ||
+		    time_uptime == starttime) {
+			thread_lock(td);
+			sched_prio(td, PPAUSE);
+			thread_unlock(td);
+		}
 		if (syncer_state != SYNCER_RUNNING)
 			cv_timedwait(&sync_wakeup, &sync_mtx,
 			    hz / SYNCER_SHUTDOWN_SPEEDUP);
diff --git a/sys/net/flowtable.c b/sys/net/flowtable.c
index 1ba07f9..198c4c3 100644
--- a/sys/net/flowtable.c
+++ b/sys/net/flowtable.c
@@ -1549,9 +1549,11 @@ static void
 flowtable_cleaner(void)
 {
 	VNET_ITERATOR_DECL(vnet_iter);
+	struct thread *td;
 
 	if (bootverbose)
 		log(LOG_INFO, "flowtable cleaner started\n");
+	td = curthread;
 	while (1) {
 		VNET_LIST_RLOCK();
 		VNET_FOREACH(vnet_iter) {
@@ -1566,6 +1568,9 @@ flowtable_cleaner(void)
 		 * is arbitrary
 		 */
 		mtx_lock(&flowclean_lock);
+		thread_lock(td);
+		sched_prio(td, PPAUSE);
+		thread_unlock(td);
 		flowclean_cycles++;
 		cv_broadcast(&flowclean_f_cv);
 		cv_timedwait(&flowclean_c_cv, &flowclean_lock, flowclean_freq);