Re: [PATCH 0/6] freepgt: free_pgtables shakeup

[Russell King]

On Sun, Mar 27, 2005 at 10:17:39AM -0800, David S. Miller wrote:
> On Sun, 27 Mar 2005 08:57:25 +0100
> Russell King <rmk+lkml@xxxxxxxxxxxxxxxx> wrote:
> 
> > Unfortunately not - free_pgd_slow doesn't have any knowledge about the
> > mm_struct that the pgd was associated with.
> 
> You could store the mm pointer in the page struct of the
> pgd, we used to that before set_pte_at() existed on
> sparc64 and ppc64 for pte level tables.
> 
> page->mapping and page->index are basically free game for
> tracking information assosciated with page table chunks.

Why would I want to do this, given that decrementing mm->nr_ptes in
free_pgd_slow() would make it negative ?  Am I missing something
obvious?

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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