From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vasily Averin Subject: [PATCH v5 06/16] memcg: enable accounting for scm_fp_list objects Date: Mon, 19 Jul 2021 13:44:56 +0300 Message-ID: <4fe78621-16a8-ebd9-d7f5-f13c52eb36ff@virtuozzo.com> References: 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=UZrH4BVKP7hsH0Ef9AbThzsAu5M7Nu3PE7kKwMt/YWY=; b=XHVkIpI92bVaY20EHc5 GtWFwWzv6wl4oufrCaN5OCs1l6PwTbHZydRscCdAV8vZ9BpzdZnbzPstQYpTOMnvEtgB+zqcMpbO7 mopc2HiC1RqmEa2odgR7qj8iBG0JI03+3LIvcSyIkwfDCJlZuB5Xl+2BZMDK4aNvZOzfYPf4gOA=; 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 , "David S. Miller" , Eric Dumazet , Jakub Kicinski , netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org unix sockets allows to send file descriptors via SCM_RIGHTS type messages. Each such send call forces kernel to allocate up to 2Kb memory for struct scm_fp_list. It makes sense to account for them to restrict the host's memory consumption from inside the memcg-limited container. Signed-off-by: Vasily Averin --- net/core/scm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/scm.c b/net/core/scm.c index ae3085d..5c356f0 100644 --- a/net/core/scm.c +++ b/net/core/scm.c @@ -79,7 +79,7 @@ static int scm_fp_copy(struct cmsghdr *cmsg, struct scm_fp_list **fplp) if (!fpl) { - fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL); + fpl = kmalloc(sizeof(struct scm_fp_list), GFP_KERNEL_ACCOUNT); if (!fpl) return -ENOMEM; *fplp = fpl; @@ -355,7 +355,7 @@ struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl) return NULL; new_fpl = kmemdup(fpl, offsetof(struct scm_fp_list, fp[fpl->count]), - GFP_KERNEL); + GFP_KERNEL_ACCOUNT); if (new_fpl) { for (i = 0; i < fpl->count; i++) get_file(fpl->fp[i]); -- 1.8.3.1