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authorShaohua Li <shaohua.li@intel.com>2012-01-12 17:19:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-12 20:13:08 -0800
commit45676885b76237a4c236d26fe20a9b0cfdb2eb22 (patch)
treee1a5222c4c7b439cb6a27ace0e36e0280f8b7870 /mm/huge_memory.c
parentf21760b15dcd091e5afd38d0b97197b45f7ef2ea (diff)
thp: improve order in lru list for split huge page
Put the tail subpages of an isolated hugepage under splitting in the lru reclaim head as they supposedly should be isolated too next. Queues the subpages in physical order in the lru for non isolated hugepages under splitting. That might provide some theoretical cache benefit to the buddy allocator later. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Johannes Weiner <jweiner@redhat.com> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5a595554bd8..76cc3f7dd4f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1228,7 +1228,6 @@ static int __split_huge_page_splitting(struct page *page,
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;
int tail_count = 0;
@@ -1239,7 +1238,7 @@ static void __split_huge_page_refcount(struct page *page)
/* complete memcg works before add pages to LRU */
mem_cgroup_split_huge_fixup(page);
- for (i = 1; i < HPAGE_PMD_NR; i++) {
+ for (i = HPAGE_PMD_NR - 1; i >= 1; i--) {
struct page *page_tail = page + i;
/* tail_page->_mapcount cannot change */
@@ -1302,7 +1301,7 @@ static void __split_huge_page_refcount(struct page *page)
BUG_ON(page_tail->mapping);
page_tail->mapping = page->mapping;
- page_tail->index = ++head_index;
+ page_tail->index = page->index + i;
BUG_ON(!PageAnon(page_tail));
BUG_ON(!PageUptodate(page_tail));