linux-kernel - Re: [PATCH net] net: memcontrol: charge allocated memory after mem_cgroup_sk

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Message-ID: <20180125171549.GA21946@castle.DHCP.thefacebook.com>
Date:   Thu, 25 Jan 2018 17:15:55 +0000
From:   Roman Gushchin <guro@...com>
To:     David Miller <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>, <edumazet@...gle.com>, <hannes@...xchg.org>,
        <tj@...nel.org>
Subject: Re: [PATCH net] net: memcontrol: charge allocated memory after
 mem_cgroup_sk_alloc()

On Thu, Jan 25, 2018 at 12:03:02PM -0500, David Miller wrote:
> From: Roman Gushchin <guro@...com>
> Date: Thu, 25 Jan 2018 00:19:11 +0000
> 
> > @@ -476,6 +477,10 @@ struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern)
> >  		spin_unlock_bh(&queue->fastopenq.lock);
> >  	}
> >  	mem_cgroup_sk_alloc(newsk);
> > +	amt = sk_memory_allocated(newsk);
> > +	if (amt && newsk->sk_memcg)
> > +		mem_cgroup_charge_skmem(newsk->sk_memcg, amt);
> > +
> 
> This looks confusing to me.
> 
> sk_memory_allocated() is the total amount of memory used by all
> sockets for a particular "struct proto", not just for that specific
> socket.

Oh, I see...

> 
> Maybe I don't understand how this socket memcg stuff works, but it
> seems like you should be looking instead at how much memory is
> allocated to this specific socket.

Yes, this is what I wanted to do originally.
Let me find a proper way to do this.

Thank you!

Roman