linux-kernel - Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE

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Message-ID: <20070725175606.GP11781@holomorphy.com>
Date:	Wed, 25 Jul 2007 10:56:06 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Andrea Arcangeli <andrea@...e.de>
Cc:	Dave Hansen <haveblue@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE_SIZE)

On Wed, Jul 25, 2007 at 04:39:04PM +0200, Andrea Arcangeli wrote:
> For the kernel stack btw, when alloc_pages(order=1) fails vmalloc
> should be used and 4k stacks can be dropped. Nobody does dma from the
> stack anymore these days IIRC (it doesn't work in all archs anyway).

I have recent code for that circulating, albeit intended for debugging
purposes. There's nothing particularly debug-oriented about it, though,
apart from the fact a guard page is automatically set up by vmalloc()
and that the use of vmalloc() is unconditional.

As for the rest, I'm sure there could be a lively conversation, but
consensus, so I'll let it go.


-- wli
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