Re: [RFC PATCH 00/28] ktap: A lightweight dynamic tracing tool for Linux

From: Ingo Molnar
Date: Wed Apr 02 2014 - 03:43:37 EST

* Jovi Zhangwei <jovi.zhangwei@xxxxxxxxx> wrote:

> So based on all these input, I suggest:
> Put all these community efforts together, figure out the proper
> design implementation of dynamic tracing tool, ktap can be a good
> start to build upon it, evolve to a unified kernel script engine
> with ebpf together, finally service for dynamic tracing and
> network(if possible).
> Our goal is same and very clearly, we really want a "simple &
> flexible & safe" dynamic scripting tracing tool for Linux, which
> could compare or even better than Dtrace, this is the motivation of
> ktap project.
> Two solution may be take:
> 1). upstream ktap into core trace and evolve it step by step, and
> finally make a integrated bytecode engine, it's a long process,
> but I think it's worth.
> 2). move ktap back into staging, and graduate from staging after the
> code make tracing people and ebpf people both happy.
> The benefit is the process will be under the eyes of community.
> Ingo, steven, Greg, what do you think?

For now I'm opting for a third option:

3) Maintain my NAK on the ktap patches until they address the
fundamental design concerns outlined by Alexei and others in
their review feedback:

NAKed-by: Ingo Molnar <mingo@xxxxxxxxxx>

The thing is, I've outlined some of the concerns in my previous
review. Not much happened on that front, for example ktap did not get
any closer in integrating with BPF. Many months have passed since the
previous ktap submission, still I see no progress on the 'design'
front. That really needs to change.

Please keep me Cc:-ed to any and all future ktap submissions so I can
monitor ktap's progress and lift the NAK if the design concerns have
been addressed.


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