netdev - Re: [PATCH net-next v3 2/3] udp: implement memory accounting helpers

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Date:   Thu, 29 Sep 2016 07:13:28 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        James Morris <jmorris@...ei.org>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Alexander Duyck <aduyck@...antis.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Tom Herbert <tom@...bertland.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Edward Cree <ecree@...arflare.com>, linux-nfs@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/3] udp: implement memory accounting helpers

On Thu, 2016-09-29 at 16:01 +0200, Paolo Abeni wrote:

> When we reach __sk_mem_reduce_allocated() we are sure we can free the
> specified amount of memory, so we only need to ensure consistent
> sk_prot->memory_allocated updates. The current atomic operation suffices
> to this.

Then why are you updating sk->sk_forward_alloc using racy operations ?

If this is not needed or racy, do not do it.

So that we can remove this annoying thing that a dynamic checker could
very well detect.