Re: Rising io_load results Re: 2.5.63-mm1

[Hugh Dickins]

On Thu, 27 Feb 2003, Andrew Morton wrote:
> 
> No, it is still wrong.  Mapped cannot exceed MemTotal.

It needs this in addition to Dave's patch from yesterday:

--- 2.5.63-objfix-1/mm/rmap.c	Thu Feb 27 23:37:28 2003
+++ 2.5.63-objfix-2/mm/rmap.c	Fri Feb 28 12:33:58 2003
@@ -349,7 +349,8 @@
 			BUG();
 		if (atomic_read(&page->pte.mapcount) == 0)
 			BUG();
-		atomic_dec(&page->pte.mapcount);
+		if (atomic_dec_and_test(&page->pte.mapcount))
+			dec_page_state(nr_mapped);
 		return;
 	}