linux-kernel - [PATCH v4 14/16] memcg: enable accounting for fasync

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Message-ID: <d3ed3447-e44b-0ff4-b7a6-b20750f4a88e@virtuozzo.com>
Date:   Wed, 28 Apr 2021 09:54:05 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     cgroups@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>
Cc:     Roman Gushchin <guro@...com>, Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 14/16] memcg: enable accounting for fasync_cache

fasync_struct is used by almost all character device drivers to set up
the fasync queue, and for regular files by the file lease code.
This structure is quite small but long-living and it can be assigned
for any open file.

It makes sense to account for its allocations to restrict the host's
memory consumption from inside the memcg-limited container.

Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 fs/fcntl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index dfc72f1..7941559 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -1049,7 +1049,8 @@ static int __init fcntl_init(void)
 			__FMODE_EXEC | __FMODE_NONOTIFY));
 
 	fasync_cache = kmem_cache_create("fasync_cache",
-		sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL);
+					 sizeof(struct fasync_struct), 0,
+					 SLAB_PANIC | SLAB_ACCOUNT, NULL);
 	return 0;
 }
 
-- 
1.8.3.1