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mm/page_alloc: when handling percpu_pagelist_fraction, don't unneedly recalulate high

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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>
This commit is contained in:
Cody P Schafer 2013-07-03 15:01:34 -07:00 • committed by Linus Torvalds
parent 0a647f3811
commit 22a7f12b16
1 changed files with 4 additions and 6 deletions
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10
mm/page_alloc.c
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@ -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 * 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. * can have before it gets flushed back to buddy allocator.
*/ */
int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
void __user *buffer, size_t *length, loff_t *ppos) 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); mutex_lock(&pcp_batch_high_lock);
for_each_populated_zone(zone) { for_each_populated_zone(zone) {
for_each_possible_cpu(cpu) { unsigned long high;
unsigned long high; high = zone->managed_pages / percpu_pagelist_fraction;
high = zone->managed_pages / percpu_pagelist_fraction; for_each_possible_cpu(cpu)
setup_pagelist_highmark( setup_pagelist_highmark(
per_cpu_ptr(zone->pageset, cpu), high); per_cpu_ptr(zone->pageset, cpu), high);
}
} }
mutex_unlock(&pcp_batch_high_lock); mutex_unlock(&pcp_batch_high_lock);
return 0; return 0;