From 9bee78b4d54e42c90f606c98c50b3a0a45086973 Mon Sep 17 00:00:00 2001 From: Cody P Schafer Date: Thu, 23 May 2013 10:37:13 +1000 Subject: [PATCH] mm/page_alloc: when handling percpu_pagelist_fraction, don't unneedly recalulate high Simply moves calculation of the new 'high' value outside the for_each_possible_cpu() loop, as it does not depend on the cpu. Signed-off-by: Cody P Schafer Cc: Gilad Ben-Yossef Cc: KOSAKI Motohiro Cc: Mel Gorman Cc: Pekka Enberg Signed-off-by: Andrew Morton --- mm/page_alloc.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 8125263be60f..386de0f11bea 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5575,7 +5575,6 @@ int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write, * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist * can have before it gets flushed back to buddy allocator. */ - int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { @@ -5589,12 +5588,11 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, mutex_lock(&pcp_batch_high_lock); for_each_populated_zone(zone) { - for_each_possible_cpu(cpu) { - unsigned long high; - high = zone->managed_pages / percpu_pagelist_fraction; + unsigned long high; + high = zone->managed_pages / percpu_pagelist_fraction; + for_each_possible_cpu(cpu) setup_pagelist_highmark( - per_cpu_ptr(zone->pageset, cpu), high); - } + per_cpu_ptr(zone->pageset, cpu), high); } mutex_unlock(&pcp_batch_high_lock); return 0; -- 2.39.5