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Commit 22a7f12b authored by Cody P Schafer's avatar Cody P Schafer Committed by Linus Torvalds
Browse files

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: default avatarCody 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0a647f38

mm/page_alloc.c

+4 −6
Original line number Diff line number Diff line
@@ -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)

{
@@ -5589,13 +5588,12 @@ 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;

		for_each_possible_cpu(cpu)

			setup_pagelist_highmark(

					per_cpu_ptr(zone->pageset, cpu), high);

	}

	}

	mutex_unlock(&pcp_batch_high_lock);

	return 0;

}