thp: fix anon memory statistics with transparent hugepages
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>
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 8275952..9b48c24d 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -117,11 +117,19 @@
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
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 650f31e..8f7d247 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -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 @@
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 @@
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 @@
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);
}
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 892d8a17..f4f6041 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1143,6 +1143,7 @@
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 @@
__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);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a1bb59d..f4ea341 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1091,7 +1091,7 @@
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 */
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f5b762a..0882014 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1045,7 +1045,7 @@
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 @@
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 @@
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 @@
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);