[RFC][PATCH 3/3] use pte pages in OOM score

[Dave Hansen <dave@linux.vnet.ibm.com>]

PTE pages eat up memory just like anything else, but we do
not account for them in any way in the OOM scores.  They
are also _guaranteed_ to get freed up when a process is OOM
killed, while RSS is not.

Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
---

 linux-2.6.git-dave/mm/oom_kill.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff -puN mm/oom_kill.c~use-pte-pages-in-oom-scire mm/oom_kill.c
--- linux-2.6.git/mm/oom_kill.c~use-pte-pages-in-oom-scire	2011-04-15 10:37:13.184831585 -0700
+++ linux-2.6.git-dave/mm/oom_kill.c	2011-04-15 10:37:13.192831581 -0700
@@ -192,8 +192,10 @@ unsigned int oom_badness(struct task_str
 	 * The baseline for the badness score is the proportion of RAM that each
 	 * task's rss and swap space use.
 	 */
-	points = (get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS)) * 1000 /
-			totalpages;
+	points = (get_mm_rss(p->mm) +
+		  get_mm_counter(p->mm, MM_SWAPENTS) +
+		  get_mm_counter(p->mm, MM_PTEPAGES))
+		 * 1000 / totalpages;
 	task_unlock(p);
 
 	/*
_

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