linux-kernel - Re: [RFC] ktap: Another dynamic tracing tool for Linux

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Message-ID: <y0mliceujz4.fsf@fche.csb>
Date:	Mon, 31 Dec 2012 13:58:39 -0500
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Jovi Zhang <bookjovi@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] ktap: Another dynamic tracing tool for Linux

bookjovi wrote:

> [...]  This mail is RFC for discuss on a new dynamic tracing tool, I
> name it ktap. (only experimental project now)

Welcome to the problem domain!

> [...]
> what ktap differentiates with Systemtap is:
> [...]
> 2). ktap have good portability, because it compile source file to
> bytecode, like python and Java.

(From this PoV, systemtap is just as portable as the kernel, as it
generates the same sort of C code the kernel is built from.)

> [...]
> 5). ktap will be open source completely, with GPL license, it might be
> merge into mainline in someday, that's very convince for tracing user.

(systemtap has always been GPLv2, ever since its beginning in 2005.)

> [...]
> ktap use lua language syntax and bytecode as initial implementation,

Interesting approach.  I recall we considered it way back when, but
rejected it for a couple of reasons, including the at-the-time
perceived unwelcomeness of a serious bytecode interpreter within the
kernel.

> it could support kprobe, uprobe, userspace probe, etc.

Great.

> I wish you can give me some technical architecture pre-review for
> ktap, before ktap release 1.0.
> Any comments is welcome, thanks very much.

Have you made any source code available yet?

- FChE
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