Fix a minor swap leak.

Previously, the UPAGES/KSTACK area of processes/threads would leak memory
at the time that a previously swapped process was terminated.  Lukcily, the
leak was only 12K/proc, so it was unlikely to be a major problem unless you
had an undersized swap partition.

Submitted by:	dillon
Reviewed by:	silby
MFC after:	1 week

1 files changed, 20 insertions, 0 deletions

diff --git a/sys/alpha/alpha/pmap.c b/sys/alpha/alpha/pmap.c
index 1bee3dd..374adc1 100644
--- a/sys/alpha/alpha/pmap.c
+++ b/sys/alpha/alpha/pmap.c
@@ -990,6 +990,16 @@ pmap_dispose_proc(p)
 		vm_page_unwire(m, 0);
 		vm_page_free(m);
 	}
+
+	/*
+	 * If the process got swapped out some of its UPAGES might have gotten
+	 * swapped.  Just get rid of the object to clean up the swap use
+	 * proactively.  NOTE! might block waiting for paging I/O to complete.
+	 */
+	if (upobj->type == OBJT_SWAP) {
+		p->p_upages_obj = NULL;
+		vm_object_deallocate(upobj);
+	}
 }
 
 /*
@@ -1153,6 +1163,16 @@ pmap_dispose_thread(td)
 		vm_page_unwire(m, 0);
 		vm_page_free(m);
 	}
+
+	/*
+	 * If the thread got swapped out some of its KSTACK might have gotten
+	 * swapped.  Just get rid of the object to clean up the swap use
+	 * proactively.  NOTE! might block waiting for paging I/O to complete.
+	 */
+	if (ksobj->type == OBJT_SWAP) {
+		td->td_kstack_obj = NULL;
+		vm_object_deallocate(ksobj);
+	}
 }
 
 /*