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[PATCH] Use ZVC for free_pages

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This is again simplifies some of the VM counter calculations through the use
of the ZVC consolidated counters.

[michal.k.k.piotrowski@gmail.com: build fix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-02-10 01:43:02 -08:00 committed by Linus Torvalds
parent c878538598
commit d23ad42324
6 changed files with 25 additions and 46 deletions
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2
include/linux/mmzone.h
View File

@ -47,6 +47,7 @@ struct zone_padding {
#endif
enum zone_stat_item {
NR_FREE_PAGES,
NR_INACTIVE,
NR_ACTIVE,
NR_ANON_PAGES, /* Mapped anonymous pages */
@ -157,7 +158,6 @@ enum zone_type {
struct zone {
/* Fields commonly accessed by the page allocator */
unsigned long free_pages;
unsigned long pages_min, pages_low, pages_high;
/*
* We don't know if the memory that we're going to allocate will be freeable

4
kernel/power/snapshot.c
View File

@ -591,7 +591,7 @@ static unsigned int count_free_highmem_pages(void)
for_each_zone(zone)
if (populated_zone(zone) && is_highmem(zone))
cnt += zone->free_pages;
cnt += zone_page_state(zone, NR_FREE_PAGES);
return cnt;
}
@ -869,7 +869,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
for_each_zone(zone) {
meta += snapshot_additional_pages(zone);
if (!is_highmem(zone))
free += zone->free_pages;
free += zone_page_state(zone, NR_FREE_PAGES);
}
nr_pages += count_pages_for_highmem(nr_highmem);

5
kernel/power/swsusp.c
View File

@ -230,9 +230,10 @@ int swsusp_shrink_memory(void)
for_each_zone (zone)
if (populated_zone(zone)) {
if (is_highmem(zone)) {
highmem_size -= zone->free_pages;
highmem_size -=
zone_page_state(zone, NR_FREE_PAGES);
} else {
tmp -= zone->free_pages;
tmp -= zone_page_state(zone, NR_FREE_PAGES);
tmp += zone->lowmem_reserve[ZONE_NORMAL];
tmp += snapshot_additional_pages(zone);
}

3
mm/highmem.c
View File

@ -47,7 +47,8 @@ unsigned int nr_free_highpages (void)
unsigned int pages = 0;
for_each_online_pgdat(pgdat)
pages += pgdat->node_zones[ZONE_HIGHMEM].free_pages;
pages += zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
NR_FREE_PAGES);
return pages;
}

37
mm/page_alloc.c
View File

@ -395,7 +395,7 @@ static inline void __free_one_page(struct page *page,
VM_BUG_ON(page_idx & (order_size - 1));
VM_BUG_ON(bad_range(zone, page));
zone->free_pages += order_size;
__mod_zone_page_state(zone, NR_FREE_PAGES, order_size);
while (order < MAX_ORDER-1) {
unsigned long combined_idx;
struct free_area *area;
@ -631,7 +631,7 @@ static struct page *__rmqueue(struct zone *zone, unsigned int order)
list_del(&page->lru);
rmv_page_order(page);
area->nr_free--;
zone->free_pages -= 1UL << order;
__mod_zone_page_state(zone, NR_FREE_PAGES, - (1UL << order));
expand(zone, page, order, current_order, area);
return page;
}
@ -989,7 +989,8 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
int classzone_idx, int alloc_flags)
{
/* free_pages my go negative - that's OK */
long min = mark, free_pages = z->free_pages - (1 << order) + 1;
long min = mark;
long free_pages = zone_page_state(z, NR_FREE_PAGES) - (1 << order) + 1;
int o;
if (alloc_flags & ALLOC_HIGH)
@ -1444,13 +1445,7 @@ EXPORT_SYMBOL(free_pages);
*/
unsigned int nr_free_pages(void)
{
unsigned int sum = 0;
struct zone *zone;
for_each_zone(zone)
sum += zone->free_pages;
return sum;
return global_page_state(NR_FREE_PAGES);
}
EXPORT_SYMBOL(nr_free_pages);
@ -1458,13 +1453,7 @@ EXPORT_SYMBOL(nr_free_pages);
#ifdef CONFIG_NUMA
unsigned int nr_free_pages_pgdat(pg_data_t *pgdat)
{
unsigned int sum = 0;
enum zone_type i;
for (i = 0; i < MAX_NR_ZONES; i++)
sum += pgdat->node_zones[i].free_pages;
return sum;
return node_page_state(pgdat->node_id, NR_FREE_PAGES);
}
#endif
@ -1514,7 +1503,7 @@ void si_meminfo(struct sysinfo *val)
{
val->totalram = totalram_pages;
val->sharedram = 0;
val->freeram = nr_free_pages();
val->freeram = global_page_state(NR_FREE_PAGES);
val->bufferram = nr_blockdev_pages();
val->totalhigh = totalhigh_pages;
val->freehigh = nr_free_highpages();
@ -1529,10 +1518,11 @@ void si_meminfo_node(struct sysinfo *val, int nid)
pg_data_t *pgdat = NODE_DATA(nid);
val->totalram = pgdat->node_present_pages;
val->freeram = nr_free_pages_pgdat(pgdat);
val->freeram = node_page_state(nid, NR_FREE_PAGES);
#ifdef CONFIG_HIGHMEM
val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;
val->freehigh = pgdat->node_zones[ZONE_HIGHMEM].free_pages;
val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
NR_FREE_PAGES);
#else
val->totalhigh = 0;
val->freehigh = 0;
@ -1580,13 +1570,13 @@ void show_free_areas(void)
get_zone_counts(&active, &inactive, &free);
printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n"
" free:%u slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
active,
inactive,
global_page_state(NR_FILE_DIRTY),
global_page_state(NR_WRITEBACK),
global_page_state(NR_UNSTABLE_NFS),
nr_free_pages(),
global_page_state(NR_FREE_PAGES),
global_page_state(NR_SLAB_RECLAIMABLE) +
global_page_state(NR_SLAB_UNRECLAIMABLE),
global_page_state(NR_FILE_MAPPED),
@ -1612,7 +1602,7 @@ void show_free_areas(void)
" all_unreclaimable? %s"
"\n",
zone->name,
K(zone->free_pages),
K(zone_page_state(zone, NR_FREE_PAGES)),
K(zone->pages_min),
K(zone->pages_low),
K(zone->pages_high),
@ -2675,7 +2665,6 @@ static void __meminit free_area_init_core(struct pglist_data *pgdat,
spin_lock_init(&zone->lru_lock);
zone_seqlock_init(zone);
zone->zone_pgdat = pgdat;
zone->free_pages = 0;
zone->prev_priority = DEF_PRIORITY;

20
mm/vmstat.c
View File

@ -16,30 +16,17 @@
void __get_zone_counts(unsigned long *active, unsigned long *inactive,
unsigned long *free, struct pglist_data *pgdat)
{
struct zone *zones = pgdat->node_zones;
int i;
*active = node_page_state(pgdat->node_id, NR_ACTIVE);
*inactive = node_page_state(pgdat->node_id, NR_INACTIVE);
*free = 0;
for (i = 0; i < MAX_NR_ZONES; i++) {
*free += zones[i].free_pages;
}
*free = node_page_state(pgdat->node_id, NR_FREE_PAGES);
}
void get_zone_counts(unsigned long *active,
unsigned long *inactive, unsigned long *free)
{
struct pglist_data *pgdat;
*active = global_page_state(NR_ACTIVE);
*inactive = global_page_state(NR_INACTIVE);
*free = 0;
for_each_online_pgdat(pgdat) {
unsigned long l, m, n;
__get_zone_counts(&l, &m, &n, pgdat);
*free += n;
}
*free = global_page_state(NR_FREE_PAGES);
}
#ifdef CONFIG_VM_EVENT_COUNTERS
@ -454,6 +441,7 @@ const struct seq_operations fragmentation_op = {
static const char * const vmstat_text[] = {
/* Zoned VM counters */
"nr_free_pages",
"nr_active",
"nr_inactive",
"nr_anon_pages",
@ -534,7 +522,7 @@ static int zoneinfo_show(struct seq_file *m, void *arg)
"\n scanned %lu (a: %lu i: %lu)"
"\n spanned %lu"
"\n present %lu",
zone->free_pages,
zone_page_state(zone, NR_FREE_PAGES),
zone->pages_min,
zone->pages_low,
zone->pages_high,