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

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Message-ID: <20120724212616.GA29546@srcf.ucam.org>
Date:	Tue, 24 Jul 2012 22:26:16 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Seiji Aguchi <seiji.aguchi@....com>,
	"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>,
	"dzickus@...hat.com" <dzickus@...hat.com>
Subject: Re: [RFC][PATCH v2 2/3] Hold multiple logs

On Tue, Jul 24, 2012 at 09:12:25PM +0000, Luck, Tony wrote:
> > I think we inevitably lose in that scenario. I'd need to verify, but my 
> > recollection is that overwriting existing variables may be equivalent to 
> > a delete/create cycle.
> 
> This would mean that EFI really wants the OS to treat EFI variables as pretty much
> exclusively read-only.  Any activity which periodically updates a variable would
> eventually run into problems in an EFI implementation that loses the old space
> until a reset.

Sure. I'll test with a few implementations and see what I can figure 
out. We may just want to reserve some space for pstore, then have delete 
in pstore simply map to hiding the entries rather than deleting them.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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