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authorCody P Schafer <cody@linux.vnet.ibm.com>2013-07-03 15:01:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:27 -0700
commit22a7f12b1606327f0e11fcdf9043ae00bf9917df (patch)
treed1e34a4bafc4fd5c6bafa3c1db6de94fe2ec9da8 /mm/page_alloc.c
parent0a647f3811d6af56405a819341ceac23e31d4572 (diff)
downloadop-kernel-dev-22a7f12b1606327f0e11fcdf9043ae00bf9917df.zip
op-kernel-dev-22a7f12b1606327f0e11fcdf9043ae00bf9917df.tar.gz
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 <cody@linux.vnet.ibm.com> Cc: Gilad Ben-Yossef <gilad@benyossef.com> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8125263..386de0f 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;
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