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Date: Wed, 8 Nov 2000 15:56:15 +0100
From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Horst von Brand <vonbrand@inf.utfsm.cl>,
        David Woodhouse <dwmw2@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: Persistent module storage [was Linux 2.4 Status / TODO page]
Message-ID: <20001108155615.B2430@pcep-jamie.cern.ch>
In-Reply-To: <200011061631.eA6GVkw07051@pincoya.inf.utfsm.cl> <E13spzE-0006Q3-00@the-village.bc.nu>
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Alan Cox wrote:
> Add a 'preserved' tag for one section of module memory. On load look up the
> data, if its from this boot memcpy it into the module. On unload write it
> back to disk. No kernel code needed.

I like!  No kernel code, yet no races or delay.

As written that removes the possibilities of variable length persistant
data, and the data is opaque to user space.

MODULE_PARM provides type information and structure to the data.  Why
not mark certain PARMS as persistent?  Not all would be named -- a block
of opaque data is useful.  But certain things like all the mixer levels
could be named parameters, giving you both persistant storage _and_
explicit configuration when you want that.  "s" PARMS (or similar)
can hold variable length data.

-- Jamie
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