netdev - Re: [PATCH net-next 2/7] rds: hold a sock ref from rds_message to the rds

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Message-ID: <20180125153527.GJ18181@oracle.com>
Date:   Thu, 25 Jan 2018 10:35:27 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>, rds-devel@....oracle.com,
        santosh.shilimkar@...cle.com
Subject: Re: [PATCH net-next 2/7] rds: hold a sock ref from rds_message to
 the rds_sock

On (01/25/18 15:44), Willem de Bruijn wrote:
> > This patch manages the m_rs assignment in the rds_message with
> > the necessary refcount book-keeping.
> 
> You may alos be able to do the same as tcp zerocopy and
> hold an sk reference on the notification skb.

We tether the notification skb to the rds socket after the 
refcount on the rds_message goes to zero, so we already have a 
ref from the sk to the notification skb, 

If we kept a refcount of all notification skb's (even the ones that
are not ready to be unpinned yet) on the sk, then we have additional
complexity trying to figure out which skb's are ready for notification
at any point, so not sure it would make things simpler..

--Sowmini