linux-kernel - Re: [PATCH 1/5] Revert "kmemtrace: fix printk format warnings"

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Date:	Tue, 19 Aug 2008 21:32:03 +0300
From:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	"Randy.Dunlap" <rdunlap@...otime.net>, penberg@...helsinki.fi,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, mpm@...enic.com,
	tglx@...utronix.de, rostedt@...dmis.org, cl@...ux-foundation.org,
	tzanussi@...il.com
Subject: Re: [PATCH 1/5] Revert "kmemtrace: fix printk format warnings"

On Tue, Aug 19, 2008 at 02:16:53PM -0400, Mathieu Desnoyers wrote:
> Question :
> 
> Is this kmemtrace marker meant to be exposed to userspace ?
> 
> I suspect not. In all case, not directly. I expect in-kernel probes to
> be connected on these markers which will get the arguments they need,
> and maybe access the inner data structures. Anyhow, tracepoints should
> be used for that, not markers. You can later put markers in the probes
> which are themselves connected to tracepoints.
> 
> Tracepoints = in-kernel tracing API.
> 
> Markers = Data-formatting tracing API, meant to export the data either
> to user-space in text or binary format.
> 
> See
> 
> http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=shortlog
> 
> tracepoint-related patches.

I think we're ready to try tracepoints. Pekka, could you merge Mathieu's
tracepoints or otherwise provide a branch where I could submit a
tracepoint conversion patch for kmemtrace?

> Mathieu
> 
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