linux-kernel - Re: memcg causes crashes in list_lru

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Date:   Mon, 29 Apr 2019 12:09:53 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        cgroups@...r.kernel.org, mm <linux-mm@...ck.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: memcg causes crashes in list_lru_add

On 29. 04. 19, 11:25, Jiri Slaby wrote:> memcg_update_all_list_lrus
should take care about resizing the array.

It should, but:
[    0.058362] Number of physical nodes 2
[    0.058366] Skipping disabled node 0

So this should be the real fix:
--- linux-5.0-stable1.orig/mm/list_lru.c
+++ linux-5.0-stable1/mm/list_lru.c
@@ -37,11 +37,12 @@ static int lru_shrinker_id(struct list_l

 static inline bool list_lru_memcg_aware(struct list_lru *lru)
 {
-       /*
-        * This needs node 0 to be always present, even
-        * in the systems supporting sparse numa ids.
-        */
-       return !!lru->node[0].memcg_lrus;
+       int i;
+
+       for_each_online_node(i)
+               return !!lru->node[i].memcg_lrus;
+
+       return false;
 }

 static inline struct list_lru_one *





Opinions?

thanks,
-- 
js
suse labs