Update Doc and remove FIXME comment from fork.c now accounting right.
--- vmacct6/Documentation/vm/overcommit-accounting Mon Jul 29 11:48:01 2002
+++ vmacct7/Documentation/vm/overcommit-accounting Mon Jul 29 19:23:46 2002
@@ -37,13 +37,13 @@
The overcommit is based on the following rules
For a file backed map
- SHARED or READ only - 0 cost (the file is the map not swap)
+ SHARED or READ-only - 0 cost (the file is the map not swap)
+ PRIVATE WRITABLE - size of mapping per instance
- WRITABLE SHARED - size of mapping per instance
-
-For a direct map
- SHARED or READ only - size of mapping
- PRIVATE WRITEABLE - size of mapping per instance
+For an anonymous or /dev/zero map
+ SHARED - size of mapping
+ PRIVATE READ-only - 0 cost (but of little use)
+ PRIVATE WRITABLE - size of mapping per instance
Additional accounting
Pages made writable copies by mmap
@@ -66,5 +66,3 @@
To Do
-----
o Account ptrace pages (this is hard)
-o Account for shared anonymous mappings properly
- - right now we account them per instance
--- vmacct6/kernel/fork.c Mon Jul 29 11:48:04 2002
+++ vmacct7/kernel/fork.c Mon Jul 29 19:23:46 2002
@@ -210,17 +210,12 @@
retval = -ENOMEM;
if(mpnt->vm_flags & VM_DONTCOPY)
continue;
-
- /*
- * FIXME: shared writable map accounting should be one off
- */
if (mpnt->vm_flags & VM_ACCOUNT) {
unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
if (!vm_enough_memory(len))
goto fail_nomem;
charge += len;
}
-
tmp = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
if (!tmp)
goto fail_nomem;
-
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This archive was generated by hypermail 2b29 : Tue Jul 30 2002 - 14:00:34 EST