[RHEL8,COMMIT] ms/mm: fix inactive list balancing between NUMA nodes and cgroups

Submitted by Konstantin Khorenko on April 2, 2020, 1:02 p.m.

Details

Message ID 202004021302.032D2oTX002387@finist_co8.work.ct
State New
Series "Series without cover letter"
Headers show

Commit Message

Konstantin Khorenko April 2, 2020, 1:02 p.m.
The commit is pushed to "branch-rh8-4.18.0-80.1.2.vz8.3.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-80.1.2.vz8.3.4
------>
commit 8038d956102831bc28024ef01de6341865355e4b
Author: Johannes Weiner <hannes@cmpxchg.org>
Date:   Thu Apr 2 16:02:49 2020 +0300

    ms/mm: fix inactive list balancing between NUMA nodes and cgroups
    
    During !CONFIG_CGROUP reclaim, we expand the inactive list size if it's
    thrashing on the node that is about to be reclaimed.  But when cgroups
    are enabled, we suddenly ignore the node scope and use the cgroup scope
    only.  The result is that pressure bleeds between NUMA nodes depending
    on whether cgroups are merely compiled into Linux.  This behavioral
    difference is unexpected and undesirable.
    
    When the refault adaptivity of the inactive list was first introduced,
    there were no statistics at the lruvec level - the intersection of node
    and memcg - so it was better than nothing.
    
    But now that we have that infrastructure, use lruvec_page_state() to
    make the list balancing decision always NUMA aware.
    
    [hannes@cmpxchg.org: fix bisection hole]
      Link: http://lkml.kernel.org/r/20190417155241.GB23013@cmpxchg.org
    Link: http://lkml.kernel.org/r/20190412144438.2645-1-hannes@cmpxchg.org
    Fixes: 2a2e48854d70 ("mm: vmscan: fix IO/refault regression in cache workingset transition")
    Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
    Reviewed-by: Shakeel Butt <shakeelb@google.com>
    Cc: Roman Gushchin <guro@fb.com>
    Cc: Michal Hocko <mhocko@kernel.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    
    (cherry picked from commit 3b991208b897f52507168374033771a984b947b1)
    Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
---
 mm/vmscan.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

Patch hide | download patch | download mbox

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2007e1cd32c3..87286d30888b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2030,7 +2030,6 @@  static void shrink_active_list(unsigned long nr_to_scan,
  *   10TB     320        32GB
  */
 static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
-				 struct mem_cgroup *memcg,
 				 struct scan_control *sc, bool actual_reclaim)
 {
 	enum lru_list active_lru = file * LRU_FILE + LRU_ACTIVE;
@@ -2051,16 +2050,12 @@  static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
 	inactive = lruvec_lru_size(lruvec, inactive_lru, sc->reclaim_idx);
 	active = lruvec_lru_size(lruvec, active_lru, sc->reclaim_idx);
 
-	if (memcg)
-		refaults = memcg_page_state(memcg, WORKINGSET_ACTIVATE);
-	else
-		refaults = node_page_state(pgdat, WORKINGSET_ACTIVATE);
-
 	/*
 	 * When refaults are being observed, it means a new workingset
 	 * is being established. Disable active list protection to get
 	 * rid of the stale workingset quickly.
 	 */
+	refaults = lruvec_page_state(lruvec, WORKINGSET_ACTIVATE);
 	if (file && actual_reclaim && lruvec->refaults != refaults) {
 		inactive_ratio = 0;
 	} else {
@@ -2081,12 +2076,10 @@  static bool inactive_list_is_low(struct lruvec *lruvec, bool file,
 }
 
 static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
-				 struct lruvec *lruvec, struct mem_cgroup *memcg,
-				 struct scan_control *sc)
+				 struct lruvec *lruvec, struct scan_control *sc)
 {
 	if (is_active_lru(lru)) {
-		if (inactive_list_is_low(lruvec, is_file_lru(lru),
-					 memcg, sc, true))
+		if (inactive_list_is_low(lruvec, is_file_lru(lru), sc, true))
 			shrink_active_list(nr_to_scan, lruvec, sc, lru);
 		return 0;
 	}
@@ -2185,7 +2178,7 @@  static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 			 * anonymous pages on the LRU in eligible zones.
 			 * Otherwise, the small LRU gets thrashed.
 			 */
-			if (!inactive_list_is_low(lruvec, false, memcg, sc, false) &&
+			if (!inactive_list_is_low(lruvec, false, sc, false) &&
 			    lruvec_lru_size(lruvec, LRU_INACTIVE_ANON, sc->reclaim_idx)
 					>> sc->priority) {
 				scan_balance = SCAN_ANON;
@@ -2203,7 +2196,7 @@  static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
 	 * lruvec even if it has plenty of old anonymous pages unless the
 	 * system is under heavy pressure.
 	 */
-	if (!inactive_list_is_low(lruvec, true, memcg, sc, false) &&
+	if (!inactive_list_is_low(lruvec, true, sc, false) &&
 	    lruvec_lru_size(lruvec, LRU_INACTIVE_FILE, sc->reclaim_idx) >> sc->priority) {
 		scan_balance = SCAN_FILE;
 		goto out;
@@ -2352,7 +2345,7 @@  static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
 				nr[lru] -= nr_to_scan;
 
 				nr_reclaimed += shrink_list(lru, nr_to_scan,
-							    lruvec, memcg, sc);
+							    lruvec, sc);
 			}
 		}
 
@@ -2419,7 +2412,7 @@  static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc
 	 * Even if we did not try to evict anon pages at all, we want to
 	 * rebalance the anon lru active/inactive ratio.
 	 */
-	if (inactive_list_is_low(lruvec, false, memcg, sc, true))
+	if (inactive_list_is_low(lruvec, false, sc, true))
 		shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
 				   sc, LRU_ACTIVE_ANON);
 }
@@ -2822,12 +2815,8 @@  static void snapshot_refaults(struct mem_cgroup *root_memcg, pg_data_t *pgdat)
 		unsigned long refaults;
 		struct lruvec *lruvec;
 
-		if (memcg)
-			refaults = memcg_page_state(memcg, WORKINGSET_ACTIVATE);
-		else
-			refaults = node_page_state(pgdat, WORKINGSET_ACTIVATE);
-
 		lruvec = mem_cgroup_lruvec(pgdat, memcg);
+		refaults = lruvec_page_state(lruvec, WORKINGSET_ACTIVATE);
 		lruvec->refaults = refaults;
 	} while ((memcg = mem_cgroup_iter(root_memcg, memcg, NULL)));
 }
@@ -3177,7 +3166,7 @@  static void age_active_anon(struct pglist_data *pgdat,
 	do {
 		struct lruvec *lruvec = mem_cgroup_lruvec(pgdat, memcg);
 
-		if (inactive_list_is_low(lruvec, false, memcg, sc, true))
+		if (inactive_list_is_low(lruvec, false, sc, true))
 			shrink_active_list(SWAP_CLUSTER_MAX, lruvec,
 					   sc, LRU_ACTIVE_ANON);