linux-kernel - Re: [patch 00/37] Linux Kernel Markers instrumentation for sched-devel.git

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Message-ID: <20080428184935.GA1205@infradead.org>
Date:	Mon, 28 Apr 2008 14:49:35 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [patch 00/37] Linux Kernel Markers instrumentation for
	sched-devel.git

On Mon, Apr 28, 2008 at 11:47:58AM -0700, Andrew Morton wrote:
> > On Mon, Apr 28, 2008 at 11:36:10AM -0700, Andrew Morton wrote:
> > > It hides the cosmetically-ugly bits, but not the deeply ugly: each of these
> > > trace points is an extension to the kernel->userspace API, with all that
> > > this implies.
> > 
> > Not at all.  It's only accessibe to kernel code, so it per defintion
> > can't be a userspace API.
> 
> eh?  It adds human-readable printk strings.

It looks like a printk string but it isn't.  You need a kernel module
to actually connect to it and do the tracing.
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