From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vasily Averin Subject: [PATCH v6 14/16] memcg: enable accounting for posix_timers_cache slab Date: Mon, 26 Jul 2021 22:01:41 +0300 Message-ID: <55a29076-96a0-c19e-2932-c8a49d61bde1@virtuozzo.com> References: <9bf9d9bd-03b1-2adb-17b4-5d59a86a9394@virtuozzo.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Content-Type:MIME-Version:Date:Message-ID:Subject :From; bh=bJzD/4dookOedoazAyDMd9sbQFHTEV2nMBxfajFsEmQ=; b=U8FCe/K+e1NUX3XwBF8 D3xuQ39kF9ixkCs5J8uqlRtKmHoUhEfhmJZvLajoTzbfaoW7xO+0cmuQHIkPHXlzCRDD8gmubVcB3 5edHMkVIFhI6CD8q3CVmYj6zDB+hRGreBSU43kJDMo3M/Y0VW1ot1dgQZ+nFOpww/kZ62kKqL+w=; In-Reply-To: Content-Language: en-US List-ID: Content-Type: text/plain; charset="us-ascii" To: Andrew Morton Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Michal Hocko , Shakeel Butt , Johannes Weiner , Vladimir Davydov , Roman Gushchin , Thomas Gleixner , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org A program may create multiple interval timers using timer_create(). For each timer the kernel preallocates a "queued real-time signal", Consequently, the number of timers is limited by the RLIMIT_SIGPENDING resource limit. The allocated object is quite small, ~250 bytes, but even the default signal limits allow to consume up to 100 megabytes per user. It makes sense to account for them to limit the host's memory consumption from inside the memcg-limited container. Signed-off-by: Vasily Averin Reviewed-by: Thomas Gleixner --- kernel/time/posix-timers.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index dd5697d..7363f81 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -273,8 +273,8 @@ static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) static __init int init_posix_timers(void) { posix_timers_cache = kmem_cache_create("posix_timers_cache", - sizeof (struct k_itimer), 0, SLAB_PANIC, - NULL); + sizeof(struct k_itimer), 0, + SLAB_PANIC | SLAB_ACCOUNT, NULL); return 0; } __initcall(init_posix_timers); -- 1.8.3.1