[RFC][PATCH 2/8] mm: pcp: consolidate percpu_pagelist_fraction code

[Dave Hansen]

From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>

pageset_set_high_and_batch() and percpu_pagelist_fraction_sysctl_handler()
both do the same calculation for establishing pcp->high:

	high = zone->managed_pages / percpu_pagelist_fraction;

pageset_set_high_and_batch() also knows when it should be
using the sysctl-provided value or the boot-time default
behavior.  There's no reason to keep
percpu_pagelist_fraction_sysctl_handler()'s copy separate.
So, consolidate them.

The only bummer here is that pageset_set_high_and_batch() is
currently __meminit.  So, axe that and make it available at
runtime.

Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
---

 linux.git-davehans/mm/page_alloc.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff -puN mm/page_alloc.c~consolidate-percpu_pagelist_fraction-code mm/page_alloc.c
--- linux.git/mm/page_alloc.c~consolidate-percpu_pagelist_fraction-code	2013-10-15 09:57:06.143624213 -0700
+++ linux.git-davehans/mm/page_alloc.c	2013-10-15 09:57:06.148624435 -0700
@@ -4183,7 +4183,7 @@ static void pageset_setup_from_high_mark
 	pageset_update(&p->pcp, high, batch);
 }
 
-static void __meminit pageset_set_high_and_batch(struct zone *zone,
+static void pageset_set_high_and_batch(struct zone *zone,
 		struct per_cpu_pageset *pcp)
 {
 	if (percpu_pagelist_fraction)
@@ -5785,14 +5785,10 @@ int percpu_pagelist_fraction_sysctl_hand
 		return ret;
 
 	mutex_lock(&pcp_batch_high_lock);
-	for_each_populated_zone(zone) {
-		unsigned long  high;
-		high = zone->managed_pages / percpu_pagelist_fraction;
+	for_each_populated_zone(zone)
 		for_each_possible_cpu(cpu)
-			pageset_setup_from_high_mark(
-					per_cpu_ptr(zone->pageset, cpu),
-					high);
-	}
+			pageset_set_high_and_batch(zone,
+					per_cpu_ptr(zone->pageset, cpu));
 	mutex_unlock(&pcp_batch_high_lock);
 	return 0;
 }
_
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