linux-kernel - Re: [PATCH 3/3] mce: acpi/apei: trace: Enable ghes memory error trace event

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Date:	Tue, 13 Aug 2013 16:51:33 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Mauro Carvalho Chehab <m.chehab@...sung.com>, tony.luck@...el.com,
	bhelgaas@...gle.com, rostedt@...dmis.org, rjw@...k.pl,
	lance.ortiz@...com, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mce: acpi/apei: trace: Enable ghes memory error trace
 event

On 08/12/2013 06:23 PM, Borislav Petkov wrote:
> On Mon, Aug 12, 2013 at 06:11:49PM +0530, Naveen N. Rao wrote:
>> So, I looked at ghes_edac and it basically seems to boil down to
>> trace_mc_event. But, this only seems to expose the APEI data as a
>> string and doesn't look to really make all the fields available to
>> user-space in a raw manner. Not sure how well this can be utilised
>> by a user-space tool.
>
> Well, your tracepoint dumps the decoded memory error too. So all the
> information we need is already there, without edac. Or am I missing some
> bits?
>
> Thus why I'm saying is that we don't need the additional edac layer.
>

You're right - my trace point makes all the data provided by apei as-is 
to userspace. However, ghes_edac seems to squash some of this data into 
a string when reporting through mc_event.

Regards,
Naveen

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