use kmalloc for vmnodes

326974a8 · Frans Kaashoek · 9766fb7a · 326974a8 · 326974a8
--- a/proc.h
+++ b/proc.h
@@ -37,7 +37,6 @@ struct vmnode {
  uint npages;
  char *page[128];
  uint ref;
-  uint alloc;                  // in use?
  enum vmntype type;
  struct inode *ip;
  uint offset;

--- a/vm.c
+++ b/vm.c
@@ -258,9 +258,9 @@ struct {
 struct vmnode *
 vmn_alloc(uint npg, uint type)
 {
-  for(uint i = 0; i < NELEM(vmnodes.n); i++) {
+  struct vmnode *n = kmalloc(sizeof(struct vmnode));
-    struct vmnode *n = &vmnodes.n[i];
+  if (n == 0) 
-    if(n->alloc == 0 && __sync_bool_compare_and_swap(&n->alloc, 0, 1)) {
+    panic("out of vmnodes");
  if(npg > NELEM(n->page)) {
    panic("vmnode too big\n");
  }
@@ -271,9 +271,6 @@ vmn_alloc(uint npg, uint type)
  n->ip = 0;
  n->type = type;
  return n;
-    }
-  }
-  panic("out of vmnodes");
 }
 static int
@@ -310,7 +307,7 @@ vmn_free(struct vmnode *n)
  if (n->ip)
    iput(n->ip);
  n->ip = 0;
-  n->alloc = 0;
+  kmfree(n);
 }
 void