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[PATCH] mm: add populated_zone() helper 

There are numerous places we check whether a zone is populated or not.

Provide a helper function to check for populated zones and convert all
checks for zone->present_pages.

Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Con Kolivas 2006-01-06 00:11:15 -08:00 committed by Linus Torvalds
parent 80bfed904c
commit f3fe65122d
3 changed files with 13 additions and 8 deletions
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5
include/linux/mmzone.h
View File

@ -388,6 +388,11 @@ static inline struct zone *next_zone(struct zone *zone)
#define for_each_zone(zone) \
for (zone = pgdat_list->node_zones; zone; zone = next_zone(zone))
static inline int populated_zone(struct zone *zone)
{
return (!!zone->present_pages);
}
static inline int is_highmem_idx(int idx)
{
return (idx == ZONE_HIGHMEM);

8
mm/page_alloc.c
View File

@ -1358,7 +1358,7 @@ void show_free_areas(void)
show_node(zone);
printk("%s per-cpu:", zone->name);
if (!zone->present_pages) {
if (!populated_zone(zone)) {
printk(" empty\n");
continue;
} else
@ -1435,7 +1435,7 @@ void show_free_areas(void)
show_node(zone);
printk("%s: ", zone->name);
if (!zone->present_pages) {
if (!populated_zone(zone)) {
printk("empty\n");
continue;
}
@ -2134,7 +2134,7 @@ static int frag_show(struct seq_file *m, void *arg)
int order;
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
if (!zone->present_pages)
if (!populated_zone(zone))
continue;
spin_lock_irqsave(&zone->lock, flags);
@ -2167,7 +2167,7 @@ static int zoneinfo_show(struct seq_file *m, void *arg)
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
int i;
if (!zone->present_pages)
if (!populated_zone(zone))
continue;
spin_lock_irqsave(&zone->lock, flags);

8
mm/vmscan.c
View File

@ -897,7 +897,7 @@ shrink_caches(struct zone **zones, struct scan_control *sc)
for (i = 0; zones[i] != NULL; i++) {
struct zone *zone = zones[i];
if (zone->present_pages == 0)
if (!populated_zone(zone))
continue;
if (!cpuset_zone_allowed(zone, __GFP_HARDWALL))
@ -1069,7 +1069,7 @@ loop_again:
for (i = pgdat->nr_zones - 1; i >= 0; i--) {
struct zone *zone = pgdat->node_zones + i;
if (zone->present_pages == 0)
if (!populated_zone(zone))
continue;
if (zone->all_unreclaimable &&
@ -1106,7 +1106,7 @@ scan:
struct zone *zone = pgdat->node_zones + i;
int nr_slab;
if (zone->present_pages == 0)
if (!populated_zone(zone))
continue;
if (zone->all_unreclaimable && priority != DEF_PRIORITY)
@ -1258,7 +1258,7 @@ void wakeup_kswapd(struct zone *zone, int order)
{
pg_data_t *pgdat;
if (zone->present_pages == 0)
if (!populated_zone(zone))
return;
pgdat = zone->zone_pgdat;