Re: [PATCH net] net: memcontrol: charge allocated memory after mem_cgroup_sk_alloc()

[Roman Gushchin <guro@fb.com>]

On Thu, Jan 25, 2018 at 12:03:02PM -0500, David Miller wrote:
> From: Roman Gushchin <guro@fb.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