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[PATCH] mm: remove pcp low

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struct per_cpu_pages.low is useless.  Remove it.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-01-06 00:10:59 -08:00 committed by Linus Torvalds
parent 13e7444b0e
commit 2d92c5c915
2 changed files with 2 additions and 8 deletions
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1
include/linux/mmzone.h
View File

@ -46,7 +46,6 @@ struct zone_padding {
struct per_cpu_pages {
int count; /* number of pages in the list */
int low; /* low watermark, refill needed */
int high; /* high watermark, emptying needed */
int batch; /* chunk size for buddy add/remove */
struct list_head list; /* the list of pages */

9
mm/page_alloc.c
View File

@ -740,7 +740,7 @@ again:
page = NULL;
pcp = &zone_pcp(zone, get_cpu())->pcp[cold];
local_irq_save(flags);
if (pcp->count <= pcp->low)
if (!pcp->count)
pcp->count += rmqueue_bulk(zone, 0,
pcp->batch, &pcp->list);
if (likely(pcp->count)) {
@ -1345,10 +1345,9 @@ void show_free_areas(void)
pageset = zone_pcp(zone, cpu);
for (temperature = 0; temperature < 2; temperature++)
printk("cpu %d %s: low %d, high %d, batch %d used:%d\n",
printk("cpu %d %s: high %d, batch %d used:%d\n",
cpu,
temperature ? "cold" : "hot",
pageset->pcp[temperature].low,
pageset->pcp[temperature].high,
pageset->pcp[temperature].batch,
pageset->pcp[temperature].count);
@ -1790,14 +1789,12 @@ inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
pcp = &p->pcp[0]; /* hot */
pcp->count = 0;
pcp->low = 0;
pcp->high = 6 * batch;
pcp->batch = max(1UL, 1 * batch);
INIT_LIST_HEAD(&pcp->list);
pcp = &p->pcp[1]; /* cold*/
pcp->count = 0;
pcp->low = 0;
pcp->high = 2 * batch;
pcp->batch = max(1UL, batch/2);
INIT_LIST_HEAD(&pcp->list);
@ -2193,12 +2190,10 @@ static int zoneinfo_show(struct seq_file *m, void *arg)
seq_printf(m,
"\n cpu: %i pcp: %i"
"\n count: %i"
"\n low: %i"
"\n high: %i"
"\n batch: %i",
i, j,
pageset->pcp[j].count,
pageset->pcp[j].low,
pageset->pcp[j].high,
pageset->pcp[j].batch);
}