netdev - Re: [RFC PATCH net-next 0/5] tcp: TCP tracer

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Message-Id: <20141216.174524.888376617592272638.davem@davemloft.net>
Date:	Tue, 16 Dec 2014 17:45:24 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jbaron@...mai.com
Cc:	jbacik@...com, eric.dumazet@...il.com,
	alexei.starovoitov@...il.com, chavey@...gle.com, ycheng@...gle.com,
	kafai@...com, netdev@...r.kernel.org, hannes@...essinduktion.org,
	rostedt@...dmis.org, brakmo@...com, Kernel-team@...com
Subject: Re: [RFC PATCH net-next 0/5] tcp: TCP tracer

From: Jason Baron <jbaron@...mai.com>
Date: Tue, 16 Dec 2014 17:40:47 -0500

> We are interested in tcp tracing as well. Another requirement that
> we have that I don't think I saw is the ability to start/stop
> tracing on sockets (potentially multiple times) during the lifetime
> of a connection. So for example, the ability to use setsockopt(), to
> selectively start/stop tracing on a connection, so as not to incur
> overhead for non-traced sockets.

This is so backwards.

You make the tracing cheap enough that this can never be an issue.

Your requirement can only exist if the implementation is broken
by design.
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