svn commit: r326078 - user/jeff/numa/sys/vm

[Jeff Roberson]

Author: jeff
Date: Tue Nov 21 22:06:49 2017
New Revision: 326078
URL: https://svnweb.freebsd.org/changeset/base/326078

Log:
  Fix for r325754
  
  Limit UMA reclaim calls to once per-second.

Modified:
  user/jeff/numa/sys/vm/uma_core.c

Modified: user/jeff/numa/sys/vm/uma_core.c
==============================================================================
--- user/jeff/numa/sys/vm/uma_core.c	Tue Nov 21 21:18:04 2017	(r326077)
+++ user/jeff/numa/sys/vm/uma_core.c	Tue Nov 21 22:06:49 2017	(r326078)
@@ -3306,16 +3306,19 @@ void
 uma_reclaim_worker(void *arg __unused)
 {
 
-	sx_xlock(&uma_drain_lock);
 	for (;;) {
-		sx_sleep(uma_reclaim, &uma_drain_lock, PVM, "umarcl", 0);
-		if (uma_reclaim_needed) {
-			sx_xunlock(&uma_drain_lock);
-			EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_KMEM);
-			sx_xlock(&uma_drain_lock);
-			uma_reclaim_locked(true);
-			atomic_set_int(&uma_reclaim_needed, 0);
-		}
+		sx_xlock(&uma_drain_lock);
+		while (uma_reclaim_needed == 0)
+			sx_sleep(uma_reclaim, &uma_drain_lock, PVM, "umarcl",
+			    hz);
+		sx_xunlock(&uma_drain_lock);
+		EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_KMEM);
+		sx_xlock(&uma_drain_lock);
+		uma_reclaim_locked(true);
+		atomic_set_int(&uma_reclaim_needed, 0);
+		sx_xunlock(&uma_drain_lock);
+		/* Don't fire more than once per-second. */
+		pause("umarclslp", hz);
 	}
 }