svn commit: r327316 - head/sys/vm

[Konstantin Belousov]

Author: kib
Date: Thu Dec 28 22:56:30 2017
New Revision: 327316
URL: https://svnweb.freebsd.org/changeset/base/327316

Log:
  In vm_swapout_map_deactivate_pages(), it is enough to lock the map for read.
  
  Reviewed by:	alc, markj (as part of the larger patch)
  Tested by:	pho (again, as part of the larger patch)
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week
  Differential revision:	https://reviews.freebsd.org/D13671

Modified:
  head/sys/vm/vm_swapout.c

Modified: head/sys/vm/vm_swapout.c
==============================================================================
--- head/sys/vm/vm_swapout.c	Thu Dec 28 22:03:08 2017	(r327315)
+++ head/sys/vm/vm_swapout.c	Thu Dec 28 22:56:30 2017	(r327316)
@@ -263,7 +263,7 @@ vm_swapout_map_deactivate_pages(vm_map_t map, long des
 	vm_object_t obj, bigobj;
 	int nothingwired;
 
-	if (!vm_map_trylock(map))
+	if (!vm_map_trylock_read(map))
 		return;
 
 	bigobj = NULL;
@@ -327,7 +327,7 @@ vm_swapout_map_deactivate_pages(vm_map_t map, long des
 		    vm_map_max(map));
 	}
 
-	vm_map_unlock(map);
+	vm_map_unlock_read(map);
 }
 
 /*