linux-kernel - Re: [RFC] persistent store

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Message-ID: <AANLkTikbHsOpv858ts-h9oB8NvK+Tk6wf9sX8HWfecqD@mail.gmail.com>
Date:	Tue, 23 Nov 2010 13:30:54 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Tony Luck <tony.luck@...el.com>
Cc:	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] persistent store

On Tue, Nov 23, 2010 at 12:10 PM, Tony Luck <tony.luck@...el.com> wrote:
> On Mon, Nov 22, 2010 at 5:37 PM, Tony Luck <tony.luck@...el.com> wrote:
>> Yes - I assume here that the last "data_size" bytes will be enough
>> to be useful. But in your case it most likely won't be.  You could
>> lie about how much space you allow and then include some oops
>> parsing code to get the vital bits out of what is passed to you. Not
>> pretty - but it would work. If there are many such devices with limited
>> capacity, then it would make sense to include this parsing code
>> in this generic layer.
>
> Sorry - finding the good bits from the console log is architecture
> dependent ... so it can't be done (easily) in the generic code.

FYI:

Now we use ramoops for this purpose. Even tough ramoops uses volatile
memory, it's safe soft-reset and watchdog reset.
To overcome limiataion of ramoops. not persist, I'm working on mmcoops
as persistent oops record.

As the discussed story. it covers the previous oops devices,
mtdoops(drivers/mtd/mtdoops.c), ramoops (drivers/char/ramoops.c) and
mmcoops (drivers/mmc/card/mmc_oops.c).

Actually I tried to enable the lcdoops, display oops message at LCD.
but it doesn't work since not much time to display LCD.

Thank you,
Kyungmin Park


>
> -Tony
> --
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