netdev - Re: [PATCH net-next] udp: Add tracepoints to monitor skbs going in and out of a UDP socket

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Message-ID: <25668.1538672073@warthog.procyon.org.uk>
Date:   Thu, 04 Oct 2018 17:54:33 +0100
From:   David Howells <dhowells@...hat.com>
To:     David Ahern <dsahern@...il.com>
Cc:     dhowells@...hat.com, netdev@...r.kernel.org,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] udp: Add tracepoints to monitor skbs going in and out of a UDP socket

David Ahern <dsahern@...il.com> wrote:

> These do not add any real value. You are only dumping the skb address,

Not in and of themselves, no - but in combination with tracepoints elsewhere,
where you can use the skb address as a key to follow the lifetime of a
particular skb.

> and you can get the same effect with a probe on the function and dumping
> the value of the register with the skb argument.

Installing a probe requires various preconditions, including your kernel not
being locked down and having the source around AIUI.

Anyway, I've no especially strong feelings about this patch - it's been useful
for me and it might be useful to others.

David