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thp: fix anon memory statistics with transparent hugepages

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Count each transparent hugepage as HPAGE_PMD_NR pages in the LRU
statistics, so the Active(anon) and Inactive(anon) statistics in
/proc/meminfo are correct.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel 2011-01-13 15:47:13 -08:00 committed by Linus Torvalds
parent 97562cd243
commit 2c888cfbc1
5 changed files with 30 additions and 9 deletions
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8
include/linux/huge_mm.h
View file

@ -117,11 +117,19 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
return;
__vma_adjust_trans_huge(vma, start, end, adjust_next);
}
static inline int hpage_nr_pages(struct page *page)
{
if (unlikely(PageTransHuge(page)))
return HPAGE_PMD_NR;
return 1;
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
#define HPAGE_PMD_MASK ({ BUG(); 0; })
#define HPAGE_PMD_SIZE ({ BUG(); 0; })
#define hpage_nr_pages(x) 1
#define transparent_hugepage_enabled(__vma) 0
#define transparent_hugepage_flags 0UL

8
include/linux/mm_inline.h
View file

@ -1,6 +1,8 @@
#ifndef LINUX_MM_INLINE_H
#define LINUX_MM_INLINE_H
#include <linux/huge_mm.h>
/**
* page_is_file_cache - should the page be on a file LRU or anon LRU?
* @page: the page to test
@ -24,7 +26,7 @@ __add_page_to_lru_list(struct zone *zone, struct page *page, enum lru_list l,
struct list_head *head)
{
list_add(&page->lru, head);
__inc_zone_state(zone, NR_LRU_BASE + l);
__mod_zone_page_state(zone, NR_LRU_BASE + l, hpage_nr_pages(page));
mem_cgroup_add_lru_list(page, l);
}
@ -38,7 +40,7 @@ static inline void
del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l)
{
list_del(&page->lru);
__dec_zone_state(zone, NR_LRU_BASE + l);
__mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
mem_cgroup_del_lru_list(page, l);
}
@ -73,7 +75,7 @@ del_page_from_lru(struct zone *zone, struct page *page)
l += LRU_ACTIVE;
}
}
__dec_zone_state(zone, NR_LRU_BASE + l);
__mod_zone_page_state(zone, NR_LRU_BASE + l, -hpage_nr_pages(page));
mem_cgroup_del_lru_list(page, l);
}

10
mm/huge_memory.c
View file

@ -1143,6 +1143,7 @@ static void __split_huge_page_refcount(struct page *page)
int i;
unsigned long head_index = page->index;
struct zone *zone = page_zone(page);
int zonestat;
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock_irq(&zone->lru_lock);
@ -1207,6 +1208,15 @@ static void __split_huge_page_refcount(struct page *page)
__dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
__mod_zone_page_state(zone, NR_ANON_PAGES, HPAGE_PMD_NR);
/*
* A hugepage counts for HPAGE_PMD_NR pages on the LRU statistics,
* so adjust those appropriately if this page is on the LRU.
*/
if (PageLRU(page)) {
zonestat = NR_LRU_BASE + page_lru(page);
__mod_zone_page_state(zone, zonestat, -(HPAGE_PMD_NR-1));
}
ClearPageCompound(page);
compound_unlock(page);
spin_unlock_irq(&zone->lru_lock);

2
mm/memcontrol.c
View file

@ -1091,7 +1091,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
case 0:
list_move(&page->lru, dst);
mem_cgroup_del_lru(page);
nr_taken++;
nr_taken += hpage_nr_pages(page);
break;
case -EBUSY:
/* we don't affect global LRU but rotate in our LRU */

11
mm/vmscan.c
View file

@ -1045,7 +1045,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
case 0:
list_move(&page->lru, dst);
mem_cgroup_del_lru(page);
nr_taken++;
nr_taken += hpage_nr_pages(page);
break;
case -EBUSY:
@ -1103,7 +1103,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
if (__isolate_lru_page(cursor_page, mode, file) == 0) {
list_move(&cursor_page->lru, dst);
mem_cgroup_del_lru(cursor_page);
nr_taken++;
nr_taken += hpage_nr_pages(page);
nr_lumpy_taken++;
if (PageDirty(cursor_page))
nr_lumpy_dirty++;
@ -1158,14 +1158,15 @@ static unsigned long clear_active_flags(struct list_head *page_list,
struct page *page;
list_for_each_entry(page, page_list, lru) {
int numpages = hpage_nr_pages(page);
lru = page_lru_base_type(page);
if (PageActive(page)) {
lru += LRU_ACTIVE;
ClearPageActive(page);
nr_active++;
nr_active += numpages;
}
if (count)
count[lru]++;
count[lru] += numpages;
}
return nr_active;
@ -1483,7 +1484,7 @@ static void move_active_pages_to_lru(struct zone *zone,
list_move(&page->lru, &zone->lru[lru].list);
mem_cgroup_add_lru_list(page, lru);
pgmoved++;
pgmoved += hpage_nr_pages(page);
if (!pagevec_add(&pvec, page) || list_empty(list)) {
spin_unlock_irq(&zone->lru_lock);