linux-kernel - Re: [PATCH 03/20] x86, mce: Add persistent MCE event

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Message-ID: <20101110222157.GA23945@elte.hu>
Date:	Wed, 10 Nov 2010 23:21:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ben Gamari <bgamari@...il.com>
Cc:	Borislav Petkov <bp@...64.org>, acme@...radead.org,
	fweisbec@...il.com, peterz@...radead.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 03/20] x86, mce: Add persistent MCE event


* Ben Gamari <bgamari@...il.com> wrote:

> On Thu,  4 Nov 2010 16:36:39 +0100, Borislav Petkov <bp@...64.org> wrote:
> > From: Borislav Petkov <borislav.petkov@....com>
> > 
> > Add the necessary glue to enable the mce_record tracepoint on boot
> > turning it into a persistent event. This exports the MCE buffer
> > read-only to a userspace daemon which will hook into it through debugfs
> > when booting is finished.
> 
> While MCE technically is a diagnostics service, do we want to start adding 
> dependencies on debugfs in long-running, common-place daemons? I was under the 
> impression we were to avoid using debugfs for anything other than values for 
> one-off debugging.

See this current discussion thread on lkml:

   [RFC][PATCH] perf: sysfs type id

Events are being added to sysfs as we want to avoid the debugfs dependency.

Thanks,

	Ingo
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