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Message-Id: <1365470478-645-1-git-send-email-iamjoonsoo.kim@lge.com>
Date: Tue, 9 Apr 2013 10:21:16 +0900
From: Joonsoo Kim <iamjoonsoo.kim@....com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
Rik van Riel <riel@...hat.com>,
Minchan Kim <minchan@...nel.org>,
Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 1/3] mm, vmscan: count accidental reclaimed pages failed to put into lru
In shrink_(in)active_list(), we can fail to put into lru, and these pages
are reclaimed accidentally. Currently, these pages are not counted
for sc->nr_reclaimed, but with this information, we can stop to reclaim
earlier, so can reduce overhead of reclaim.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 0f615eb..5d60ae0 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -365,7 +365,7 @@ void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
extern void __free_pages(struct page *page, unsigned int order);
extern void free_pages(unsigned long addr, unsigned int order);
extern void free_hot_cold_page(struct page *page, int cold);
-extern void free_hot_cold_page_list(struct list_head *list, int cold);
+extern unsigned long free_hot_cold_page_list(struct list_head *list, int cold);
extern void __free_memcg_kmem_pages(struct page *page, unsigned int order);
extern void free_memcg_kmem_pages(unsigned long addr, unsigned int order);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8fcced7..a5f3952 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1360,14 +1360,18 @@ out:
/*
* Free a list of 0-order pages
*/
-void free_hot_cold_page_list(struct list_head *list, int cold)
+unsigned long free_hot_cold_page_list(struct list_head *list, int cold)
{
+ unsigned long nr_reclaimed = 0;
struct page *page, *next;
list_for_each_entry_safe(page, next, list, lru) {
trace_mm_page_free_batched(page, cold);
free_hot_cold_page(page, cold);
+ nr_reclaimed++;
}
+
+ return nr_reclaimed;
}
/*
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 88c5fed..eff2927 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -915,7 +915,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
*/
__clear_page_locked(page);
free_it:
- nr_reclaimed++;
/*
* Is there need to periodically free_page_list? It would
@@ -954,7 +953,7 @@ keep:
if (nr_dirty && nr_dirty == nr_congested && global_reclaim(sc))
zone_set_flag(zone, ZONE_CONGESTED);
- free_hot_cold_page_list(&free_pages, 1);
+ nr_reclaimed += free_hot_cold_page_list(&free_pages, 1);
list_splice(&ret_pages, page_list);
count_vm_events(PGACTIVATE, pgactivate);
@@ -1321,7 +1320,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
if (nr_taken == 0)
return 0;
- nr_reclaimed = shrink_page_list(&page_list, zone, sc, TTU_UNMAP,
+ nr_reclaimed += shrink_page_list(&page_list, zone, sc, TTU_UNMAP,
&nr_dirty, &nr_writeback, false);
spin_lock_irq(&zone->lru_lock);
@@ -1343,7 +1342,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
spin_unlock_irq(&zone->lru_lock);
- free_hot_cold_page_list(&page_list, 1);
+ nr_reclaimed += free_hot_cold_page_list(&page_list, 1);
/*
* If reclaim is isolating dirty pages under writeback, it implies
@@ -1438,7 +1437,7 @@ static void move_active_pages_to_lru(struct lruvec *lruvec,
__count_vm_events(PGDEACTIVATE, pgmoved);
}
-static void shrink_active_list(unsigned long nr_to_scan,
+static unsigned long shrink_active_list(unsigned long nr_to_scan,
struct lruvec *lruvec,
struct scan_control *sc,
enum lru_list lru)
@@ -1534,7 +1533,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&zone->lru_lock);
- free_hot_cold_page_list(&l_hold, 1);
+ return free_hot_cold_page_list(&l_hold, 1);
}
#ifdef CONFIG_SWAP
@@ -1617,7 +1616,8 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
{
if (is_active_lru(lru)) {
if (inactive_list_is_low(lruvec, lru))
- shrink_active_list(nr_to_scan, lruvec, sc, lru);
+ return shrink_active_list(nr_to_scan, lruvec, sc, lru);
+
return 0;
}
@@ -1861,8 +1861,8 @@ static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
* rebalance the anon lru active/inactive ratio.
*/
if (inactive_anon_is_low(lruvec))
- shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
- sc, LRU_ACTIVE_ANON);
+ sc->nr_reclaimed += shrink_active_list(SWAP_CLUSTER_MAX,
+ lruvec, sc, LRU_ACTIVE_ANON);
throttle_vm_writeout(sc->gfp_mask);
}
@@ -2470,23 +2470,27 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
}
#endif
-static void age_active_anon(struct zone *zone, struct scan_control *sc)
+static unsigned long age_active_anon(struct zone *zone,
+ struct scan_control *sc)
{
+ unsigned long nr_reclaimed = 0;
struct mem_cgroup *memcg;
if (!total_swap_pages)
- return;
+ return 0;
memcg = mem_cgroup_iter(NULL, NULL, NULL);
do {
struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);
if (inactive_anon_is_low(lruvec))
- shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
- sc, LRU_ACTIVE_ANON);
+ nr_reclaimed += shrink_active_list(SWAP_CLUSTER_MAX,
+ lruvec, sc, LRU_ACTIVE_ANON);
memcg = mem_cgroup_iter(NULL, memcg, NULL);
} while (memcg);
+
+ return nr_reclaimed;
}
static bool zone_balanced(struct zone *zone, int order,
@@ -2666,7 +2670,7 @@ loop_again:
* Do some background aging of the anon list, to give
* pages a chance to be referenced before reclaiming.
*/
- age_active_anon(zone, &sc);
+ sc.nr_reclaimed += age_active_anon(zone, &sc);
/*
* If the number of buffer_heads in the machine
--
1.7.9.5
--
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