linux-kernel - Re: [PATCH v24b] RAS: Add a tracepoint for reporting memory controller events

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Date:	Tue, 22 May 2012 11:28:32 +0200
From:	Borislav Petkov <borislav.petkov@....com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
CC:	Borislav Petkov <borislav.petkov@....com>,
	"Luck, Tony" <tony.luck@...el.com>, Ingo Molnar <mingo@...nel.org>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aristeu Rozanski <arozansk@...hat.com>,
	Doug Thompson <norsk5@...oo.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v24b] RAS: Add a tracepoint for reporting memory
 controller events

On Tue, May 22, 2012 at 12:04:48AM -0300, Mauro Carvalho Chehab wrote:
> +TRACE_EVENT(mc_event,
> +
> +	TP_PROTO(const unsigned int err_type,
> +		 const unsigned int mc_index,
> +		 const char *error_msg,
> +		 const char *label,
> +		 int layer0,
> +		 int layer1,
> +		 int layer2,

Those are EDAC-internal layer representation, why are they exported to
userspace? Userspace needs only the location and label AFAICT.

If you export them to userspace, they need much more meaningful names -
layer{0,1,2} mean nothing outside of the kernel.

> +		 unsigned long pfn,
> +		 unsigned long offset,
> +		 unsigned long grain,

Why aren't those a single 'unsigned long address' since they all are
computed from it?

> +		 unsigned long syndrome,
> +		 const char *driver_detail),
> +
> +	TP_ARGS(err_type, mc_index, error_msg, label, layer0, layer1, layer2,
> +		pfn, offset, grain, syndrome, driver_detail),
> 
> The address is there using the edac way to represent it (page, offset, grain).

-- 
Regards/Gruss,
Boris.

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