[PATCH] mm: set per-cpu-pages lower threshold to zero

Set the low water mark for hot pages in pcp to zero.

(akpm: for the life of me I cannot remember why we created pcp->low.  Neither
can Martin and the changelog is silent.  Maybe it was just a brainfart, but I
have this feeling that there was a reason.  If not, we should remove the
fields completely.  We'll see.)

Signed-off-by: Rohit Seth <rohit.seth@intel.com>
Cc: <linux-mm@kvack.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f799217dc2f3..60663232fbb2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1755,7 +1755,7 @@ inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
 
         pcp = &p->pcp[0];               /* hot */
         pcp->count = 0;
-        pcp->low = 2 * batch;
+        pcp->low = 0;
         pcp->high = 6 * batch;
         pcp->batch = max(1UL, 1 * batch);
         INIT_LIST_HEAD(&pcp->list);
@@ -1764,7 +1764,7 @@ inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
         pcp->count = 0;
         pcp->low = 0;
         pcp->high = 2 * batch;
-        pcp->batch = max(1UL, 1 * batch);
+        pcp->batch = max(1UL, batch/2);
         INIT_LIST_HEAD(&pcp->list);
 }