From: "Seth, Rohit" 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 Cc: Signed-off-by: Andrew Morton --- mm/page_alloc.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff -puN mm/page_alloc.c~mm-set-per-cpu-pages-lower-threshold-to-zero mm/page_alloc.c --- devel/mm/page_alloc.c~mm-set-per-cpu-pages-lower-threshold-to-zero 2005-09-12 00:21:31.000000000 -0700 +++ devel-akpm/mm/page_alloc.c 2005-09-12 00:21:31.000000000 -0700 @@ -1772,7 +1772,7 @@ inline void setup_pageset(struct per_cpu 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); @@ -1781,7 +1781,7 @@ inline void setup_pageset(struct per_cpu 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); } _