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

[David S. Miller]

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.
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