linux-kernel - [PATCH 3/3] Revert "mm: bail out in shrink_inactive

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Date:   Tue, 17 Jan 2017 11:37:02 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mgorman@...e.de>,
        Minchan Kim <minchan@...nel.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH 3/3] Revert "mm: bail out in shrink_inactive_list()"

From: Michal Hocko <mhocko@...e.com>

This reverts commit 91dcade47a3d0e7c31464ef05f56c08e92a0e9c2.

inactive_reclaimable_pages shouldn't be needed anymore since
that get_scan_count is aware of the eligble zones ("mm, vmscan:
consider eligible zones in get_scan_count").

Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>
Acked-by: Minchan Kim <minchan@...nel.org>
Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/vmscan.c | 27 ---------------------------
 1 file changed, 27 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index ffac8fa7bdd8..f3255702f3df 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1701,30 +1701,6 @@ static int current_may_throttle(void)
 		bdi_write_congested(current->backing_dev_info);
 }
 
-static bool inactive_reclaimable_pages(struct lruvec *lruvec,
-				struct scan_control *sc, enum lru_list lru)
-{
-	int zid;
-	struct zone *zone;
-	int file = is_file_lru(lru);
-	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
-
-	if (!global_reclaim(sc))
-		return true;
-
-	for (zid = sc->reclaim_idx; zid >= 0; zid--) {
-		zone = &pgdat->node_zones[zid];
-		if (!managed_zone(zone))
-			continue;
-
-		if (zone_page_state_snapshot(zone, NR_ZONE_LRU_BASE +
-				LRU_FILE * file) >= SWAP_CLUSTER_MAX)
-			return true;
-	}
-
-	return false;
-}
-
 /*
  * shrink_inactive_list() is a helper for shrink_node().  It returns the number
  * of reclaimed pages
@@ -1743,9 +1719,6 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	struct pglist_data *pgdat = lruvec_pgdat(lruvec);
 	struct zone_reclaim_stat *reclaim_stat = &lruvec->reclaim_stat;
 
-	if (!inactive_reclaimable_pages(lruvec, sc, lru))
-		return 0;
-
 	while (unlikely(too_many_isolated(pgdat, file, sc))) {
 		congestion_wait(BLK_RW_ASYNC, HZ/10);
 
-- 
2.11.0