Some more ALLOC_MEMSET debug code

2f894520 · Silas Boyd-Wickizer · a184838e · 2f894520
--- a/kernel/kmalloc.cc
+++ b/kernel/kmalloc.cc
@@ -41,6 +41,9 @@ morecore(int c, int b)
  if(p == 0)
    return -1;

+  if (ALLOC_MEMSET)
+    memset(p, 3, PGSIZE);
+
  int sz = 1 << b;
  assert(sz >= sizeof(header));
  for(char *q = p; q + sz <= p + PGSIZE; q += sz){
@@ -105,8 +108,13 @@ kmalloc(u64 nbytes, const char *name)

  mtlabel(mtrace_label_heap, (void*) h, nbytes, name, strlen(name));

-  if (ALLOC_MEMSET)
+  if (ALLOC_MEMSET) {
+    char* chk = (char*)(h + 1);
+    for (int i = 0; i < (1<<b)-sizeof(*h); i++)
+      if (chk[i] != 3)
+        panic("kmalloc: oops %p+%x", chk, i);
    memset(h, 4, (1<<b));
+  }

  return h;
 }