linux-kernel - RE: [RFC][PATCH v2 2/3] Hold multiple logs

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Date:	Tue, 24 Jul 2012 17:52:25 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Seiji Aguchi <seiji.aguchi@....com>
CC:	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mikew@...gle.com" <mikew@...gle.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>,
	"Matthew Garrett (mjg@...hat.com)" <mjg@...hat.com>,
	"dzickus@...hat.com" <dzickus@...hat.com>
Subject: RE: [RFC][PATCH v2 2/3] Hold multiple logs

> I talked with Matthew a bit privately and he suggested to use QueryVariableInfo service which is supported in EFI 2.0 or later.
> If we can use it, we know the remaining NVRAM space before calling SetVariable.

So we can have (pseudo)-code like this:


	if (QueryVariableInfo says enough space)
		pstore saves log as new record
	else
		we consider over-write options to re-use an existing record, or just drop this one

That looks like a good solution - platforms that provide enough non-volatile memory for
multiple records make use of it for better diagnosis. Those that don't have available memory
don't get to test their "what do we do when we run out of space" code.

-Tony
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