From aa5368c1ecfd59ddcd4967e2fb9cf0420fe430d4 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 21 Jul 2015 00:05:52 +0200
Subject: yyy vm: destroy pages

---
 vm/vm_object.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'vm')

diff --git a/vm/vm_object.c b/vm/vm_object.c
index 3b7506d..344ce5e 100644
--- a/vm/vm_object.c
+++ b/vm/vm_object.c
@@ -756,7 +756,7 @@ void memory_object_release(
 void vm_object_abort_activity(
 	vm_object_t	object)
 {
-	vm_page_t	p;
+	vm_page_t	p, old_p;
 
 	assert(have_vm_object_lock(object));
 
@@ -770,6 +770,7 @@ void vm_object_abort_activity(
 	 */
 
 	struct rdxtree_iter iter;
+	old_p = NULL;
 	rdxtree_for_each(&object->memt, &iter, p) {
 		/*
 		 *	If it's being paged in, destroy it.
@@ -782,8 +783,16 @@ void vm_object_abort_activity(
 		 else {
 		 	if (p->unlock_request != VM_PROT_NONE)
 			 	p->unlock_request = VM_PROT_NONE;
-			PAGE_WAKEUP(p);
+			if (p == old_p)
+				/* We tried to wake this up last time.
+				   We must assume this failed, and
+				   destroy this page to avoid looping
+				   forever.  */
+				VM_PAGE_FREE(p);
+			else
+				PAGE_WAKEUP(p);
 		}
+		old_p = p;
 		rdxtree_iter_init(&iter);
 	}
 
-- 
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