Date: Thu, 10 Mar 2011 13:33:06 -0500
From: Steven Rostedt <rostedt@goodmis.org>
To: Tejun Heo <tj@kernel.org>
Cc: Roland McGrath <roland@redhat.com>, Oleg Nesterov <oleg@redhat.com>,
        jan.kratochvil@redhat.com, Denys Vlasenko <vda.linux@googlemail.com>,
        linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
        akpm@linux-foundation.org
Subject: Re: [RFC] Proposal for ptrace improvements
Message-ID: <20110310183305.GD12521@home.goodmis.org>
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On Wed, Mar 09, 2011 at 11:28:55AM +0100, Tejun Heo wrote:
> 
> If someone is looking for completely transparent light weight
> monitoring, there is a much better fitting mechanism for that and it
> works frigging well and provides much better insight into what's going
> on with the system.
> 
> Use tracing for tracing.
> 

Hmm, what tracing utility exactly? If I want to trace a running task,
that I have the debug info on it where I would have the ability to
insert probes, which utility would you recommend?

strace and gdb use ptrace

ftrace focuses on the kernel.

I don't think perf has a good way to trace userspace yet.

I haven't taken a good look at lttng, but I think it has some sort of
library that is attached to the process. Is there a better way than
attching a library to said task.

systemtap may have ways too, but I think it depends on utrace which has
pretty much been nak'd in the kernel.

-- Steve

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