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

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Date:	Sun, 14 Dec 2014 17:56:41 -0800
From:	Martin KaFai Lau <kafai@...com>
To:	<netdev@...r.kernel.org>
CC:	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Lawrence Brakmo <brakmo@...com>, Josef Bacik <jbacik@...com>,
	Kernel Team <Kernel-team@...com>
Subject: [RFC PATCH net-next 0/5] tcp: TCP tracer

Hi,

We have been using the kernel ftrace infra to collect TCP per-flow statistics.
The following patch set is a first slim-down version of our
existing implementation. We would like to get some early feedback
and make it useful for others.

[RFC PATCH net-next 1/5] tcp: Add TCP TRACE_EVENTs:
Defines some basic tracepoints (by TRACE_EVENT).

[RFC PATCH net-next 2/5] tcp: A perf script for TCP tracepoints:
A sample perf script with simple ip/port filtering and summary output.

[RFC PATCH net-next 3/5] tcp: Add a few more tracepoints for tcp tracer:
Declares a few more tracepoints (by DECLARE_TRACE) which are
used by the tcp_tracer.  The tcp_tracer is in the patch 5/5.

[RFC PATCH net-next 4/5] tcp: Introduce tcp_sk_trace and related structs:
Defines a few tcp_trace structs which are used to collect statistics
on each tcp_sock.

[RFC PATCH net-next 5/5] tcp: Add TCP tracer:
It introduces a tcp_tracer which hooks onto the tracepoints defined in the
patch 1/5 and 3/5.  It collects data defined in patch 4/5. We currently
use this tracer to collect per-flow statistics.  The commit log has
some more details.

Thanks,
--Martin
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