Remove vmnode avars from VM system

This have to do with implementation, not interface. Removing these unmasks the sharing on tlbflush_req, which is something we expected. Luckily, it doesn't expose any other sharing.

Remove vmnode avars from VM system
bbacc5e4 · Austin Clements · ab154d36 · bbacc5e4
--- a/kernel/vm.cc
+++ b/kernel/vm.cc
@@ -132,10 +132,7 @@ vmnode::copy()
 int
 vmnode::loadpg(off_t off)
 {
-#ifdef MTRACE 
  mtreadavar("inode:%x.%x", ip->dev, ip->inum);
-  mtwriteavar("vmnode:%p", this);
-#endif

  assert(off <= sz);

@@ -685,8 +682,6 @@ vmap::pagefault(uptr va, u32 err)
    *pte = v2p(m->n->page[npg]) | PTE_P | PTE_U | PTE_W;
  }

-  mtreadavar("vmnode:%p", m->n);
-
  return 1;
 }

@@ -736,7 +731,6 @@ vmap::pagelookup(uptr va)
      throw_bad_alloc();

  char* kptr = (char*)(m->n->page[npg]);
-  mtreadavar("vmnode:%p", m->n);
  return &kptr[va & (PGSIZE-1)];
 }