[PATCH] mm acct accounting fix

This patch fixes mm->total_vm and mm->locked_vm acctounting in case when
move_page_tables() fails inside move_vma().

Signed-Off-By: Kirill Korotaev <dev@sw.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/mm/mremap.c b/mm/mremap.c
index 0dd7ace94e51..ec7238a78f36 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -224,6 +224,12 @@ static unsigned long move_vma(struct vm_area_struct *vma,
                         split = 1;
         }
 
+        /*
+         * if we failed to move page tables we still do total_vm increment
+         * since do_munmap() will decrement it by old_len == new_len
+         */
+        mm->total_vm += new_len >> PAGE_SHIFT;
+
         if (do_munmap(mm, old_addr, old_len) < 0) {
                 /* OOM: unable to split vma, just get accounts right */
                 vm_unacct_memory(excess >> PAGE_SHIFT);
@@ -237,7 +243,6 @@ static unsigned long move_vma(struct vm_area_struct *vma,
                         vma->vm_next->vm_flags |= VM_ACCOUNT;
         }
 
-        mm->total_vm += new_len >> PAGE_SHIFT;
         __vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT);
         if (vm_flags & VM_LOCKED) {
                 mm->locked_vm += new_len >> PAGE_SHIFT;