linux-kernel - Re: [PATCH 8/8] af_unix: charge buffers to kmemcg

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Message-ID: <20160524074156.GG7917@esperanza>
Date:	Tue, 24 May 2016 10:41:56 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 8/8] af_unix: charge buffers to kmemcg

[adding netdev to Cc]

On Mon, May 23, 2016 at 01:20:29PM +0300, Vladimir Davydov wrote:
> Unix sockets can consume a significant amount of system memory, hence
> they should be accounted to kmemcg.
> 
> Since unix socket buffers are always allocated from process context,
> all we need to do to charge them to kmemcg is set __GFP_ACCOUNT in
> sock->sk_allocation mask.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> ---
>  net/unix/af_unix.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> index 80aa6a3e6817..022bdd3ab7d9 100644
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -769,6 +769,7 @@ static struct sock *unix_create1(struct net *net, struct socket *sock, int kern)
>  	lockdep_set_class(&sk->sk_receive_queue.lock,
>  				&af_unix_sk_receive_queue_lock_key);
>  
> +	sk->sk_allocation	= GFP_KERNEL_ACCOUNT;
>  	sk->sk_write_space	= unix_write_space;
>  	sk->sk_max_ack_backlog	= net->unx.sysctl_max_dgram_qlen;
>  	sk->sk_destruct		= unix_sock_destructor;