linux-kernel - Re: [PATCH 0/7] utrace/ptrace

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Message-Id: <20091222135809.1ab10869.akpm@linux-foundation.org>
Date:	Tue, 22 Dec 2009 13:58:09 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Subject: Re: [PATCH 0/7] utrace/ptrace

On Fri, 18 Dec 2009 02:11:16 +0100
Oleg Nesterov <oleg@...hat.com> wrote:

> Hello.
> 
> This is the new iteration of Roland's utrace patch, this time
> with "rewrite-ptrace-via-utrace" + cleanups in utrace core.
> 

So... should we merge this?

I'll confess that I've rather forgotten why we might want this.

> It allows for multiple separate tracing engines to work
> in parallel without interfering with each other.  Higher-level tracing
> facilities can be implemented as loadable kernel modules using this layer.

That's a bit brief.  Do you have a nicer sales brochure?  What are
these "separate tracing engines" and what is their merge status and why
would we want any of them, for what purpose?  etc.

IOW: give us a reason!
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