linux-kernel - Re: [PATCH v4 1/2] mm/list_lru.c: fix list_lru_count

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Date:   Sat, 1 Jul 2017 19:28:25 +0300
From:   Vladimir Davydov <vdavydov.dev@...il.com>
To:     Sahitya Tummala <stummala@...eaurora.org>
Cc:     Alexander Polakov <apolyakov@...et.ru>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, viro@...iv.linux.org.uk,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] mm/list_lru.c: fix list_lru_count_node() to be
 race free

On Thu, Jun 29, 2017 at 09:09:15AM +0530, Sahitya Tummala wrote:
> list_lru_count_node() iterates over all memcgs to get
> the total number of entries on the node but it can race with
> memcg_drain_all_list_lrus(), which migrates the entries from
> a dead cgroup to another. This can return incorrect number of
> entries from list_lru_count_node().
> 
> Fix this by keeping track of entries per node and simply return
> it in list_lru_count_node().
> 
> Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>

Acked-by: Vladimir Davydov <vdavydov.dev@...il.com>