From: Jaewon Kim <jaewon31.kim@samsung.com>
To: akpm@linux-foundation.org
Cc: mgorman@suse.de, minchan@kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, jaewon31.kim@gmail.com,
        Jaewon Kim <jaewon31.kim@samsung.com>
Subject: [PATCH] vmscan: reclaim_clean_pages_from_list() must count mlocked
 pages
Date: Mon, 03 Aug 2015 19:18:27 +0900
Message-id: <1438597107-18329-1-git-send-email-jaewon31.kim@samsung.com>
DLP-Filter: Pass
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2658
Lines: 76

reclaim_clean_pages_from_list() decreases NR_ISOLATED_FILE by returned
value from shrink_page_list(). But mlocked pages in the isolated
clean_pages page list would be removed from the list but not counted as
nr_reclaimed. Fix this miscounting by returning the number of mlocked
pages and count it.

Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
---
 mm/vmscan.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5e8eadd..5837695 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -849,6 +849,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 				      unsigned long *ret_nr_congested,
 				      unsigned long *ret_nr_writeback,
 				      unsigned long *ret_nr_immediate,
+				      unsigned long *ret_nr_mlocked,
 				      bool force_reclaim)
 {
 	LIST_HEAD(ret_pages);
@@ -1158,6 +1159,7 @@ cull_mlocked:
 			try_to_free_swap(page);
 		unlock_page(page);
 		putback_lru_page(page);
+		(*ret_nr_mlocked)++;
 		continue;
 
 activate_locked:
@@ -1197,6 +1199,7 @@ unsigned long reclaim_clean_pages_from_list(struct zone *zone,
 		.may_unmap = 1,
 	};
 	unsigned long ret, dummy1, dummy2, dummy3, dummy4, dummy5;
+	unsigned long nr_mlocked = 0;
 	struct page *page, *next;
 	LIST_HEAD(clean_pages);
 
@@ -1210,8 +1213,10 @@ unsigned long reclaim_clean_pages_from_list(struct zone *zone,
 
 	ret = shrink_page_list(&clean_pages, zone, &sc,
 			TTU_UNMAP|TTU_IGNORE_ACCESS,
-			&dummy1, &dummy2, &dummy3, &dummy4, &dummy5, true);
+			&dummy1, &dummy2, &dummy3, &dummy4, &dummy5,
+			&nr_mlocked, true);
 	list_splice(&clean_pages, page_list);
+	ret += nr_mlocked;
 	mod_zone_page_state(zone, NR_ISOLATED_FILE, -ret);
 	return ret;
 }
@@ -1523,6 +1528,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	unsigned long nr_unqueued_dirty = 0;
 	unsigned long nr_writeback = 0;
 	unsigned long nr_immediate = 0;
+	unsigned long nr_mlocked = 0;
 	isolate_mode_t isolate_mode = 0;
 	int file = is_file_lru(lru);
 	struct zone *zone = lruvec_zone(lruvec);
@@ -1565,7 +1571,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 
 	nr_reclaimed = shrink_page_list(&page_list, zone, sc, TTU_UNMAP,
 				&nr_dirty, &nr_unqueued_dirty, &nr_congested,
-				&nr_writeback, &nr_immediate,
+				&nr_writeback, &nr_immediate, &nr_mlocked,
 				false);
 
 	spin_lock_irq(&zone->lru_lock);
-- 
1.9.1

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