memcg: add zone_reclaim_stat
Introduce mem_cgroup_per_zone::reclaim_stat member and its statics
collecting function.
Now, get_scan_ratio() can calculate correct value on memcg reclaim.
[hugh@veritas.com: avoid reclaim_stat oops when disabled]
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d958d62..56fc7ab 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -133,6 +133,9 @@
static struct zone_reclaim_stat *get_reclaim_stat(struct zone *zone,
struct scan_control *sc)
{
+ if (!scan_global_lru(sc))
+ return mem_cgroup_get_reclaim_stat(sc->mem_cgroup, zone);
+
return &zone->reclaim_stat;
}
@@ -1087,17 +1090,14 @@
__mod_zone_page_state(zone, NR_INACTIVE_ANON,
-count[LRU_INACTIVE_ANON]);
- if (scan_global_lru(sc)) {
+ if (scan_global_lru(sc))
zone->pages_scanned += nr_scan;
- reclaim_stat->recent_scanned[0] +=
- count[LRU_INACTIVE_ANON];
- reclaim_stat->recent_scanned[0] +=
- count[LRU_ACTIVE_ANON];
- reclaim_stat->recent_scanned[1] +=
- count[LRU_INACTIVE_FILE];
- reclaim_stat->recent_scanned[1] +=
- count[LRU_ACTIVE_FILE];
- }
+
+ reclaim_stat->recent_scanned[0] += count[LRU_INACTIVE_ANON];
+ reclaim_stat->recent_scanned[0] += count[LRU_ACTIVE_ANON];
+ reclaim_stat->recent_scanned[1] += count[LRU_INACTIVE_FILE];
+ reclaim_stat->recent_scanned[1] += count[LRU_ACTIVE_FILE];
+
spin_unlock_irq(&zone->lru_lock);
nr_scanned += nr_scan;
@@ -1155,7 +1155,7 @@
SetPageLRU(page);
lru = page_lru(page);
add_page_to_lru_list(zone, page, lru);
- if (PageActive(page) && scan_global_lru(sc)) {
+ if (PageActive(page)) {
int file = !!page_is_file_cache(page);
reclaim_stat->recent_rotated[file]++;
}
@@ -1230,8 +1230,8 @@
*/
if (scan_global_lru(sc)) {
zone->pages_scanned += pgscanned;
- reclaim_stat->recent_scanned[!!file] += pgmoved;
}
+ reclaim_stat->recent_scanned[!!file] += pgmoved;
if (file)
__mod_zone_page_state(zone, NR_ACTIVE_FILE, -pgmoved);
@@ -1272,8 +1272,7 @@
* This helps balance scan pressure between file and anonymous
* pages in get_scan_ratio.
*/
- if (scan_global_lru(sc))
- reclaim_stat->recent_rotated[!!file] += pgmoved;
+ reclaim_stat->recent_rotated[!!file] += pgmoved;
while (!list_empty(&l_inactive)) {
page = lru_to_page(&l_inactive);