linux-kernel - Re: [PATCH 9/18] 2.6.17.9 perfmon2 patch for review: kernel-level interface

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Date:	27 Aug 2006 20:31:09 +0200
From:	Andi Kleen <ak@...e.de>
To:	Chuck Ebbert <76306.1226@...puserve.com>
Cc:	Stephane Eranian <eranian@....hp.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH 9/18] 2.6.17.9 perfmon2 patch for review: kernel-level interface

Chuck Ebbert <76306.1226@...puserve.com> writes:

> In-Reply-To: <20060825134704.GA21398@...radead.org>
> 
> On Fri, 25 Aug 2006 14:47:04 +0100, Christoph Hellwig wrote:
> 
> > > This interface is for people writing kprobes who want to do performance
> > > monitoring within their probe code.  There will probably never be any
> > > in-kernel users, just like there are no in-kernel users of kprobes.
> >
> > Wrong argument.  There is a in-tree user of kprobes and I plan to submit
> > a lot more.
> 
> OK.  More than two years after kprobes went into the kernel, a single
> in-kernel user has now appeared in 2.6.18-rc: /net/ipv4/tcp_probe.c

No rules without exceptions. But there has to be a quite good rationale.
kprobes had one.  The mythical perfmon in kernel user doesn't so far.

-Andi
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