Re: invalidate_inode_pages in 2.5.32/3

From: Rik van Riel (riel@conectiva.com.br)
Date: Thu Sep 12 2002 - 17:30:11 EST

On Thu, 12 Sep 2002, Andrew Morton wrote:

> Well the lazy invalidation would be OK - defer that to the next
> userspace access,

I think I have an idea on how to do that, here's some pseudocode:

invalidate_page(struct page * page) {
        SetPageInvalidated(page);
        rmap_lock(page);
        for_each_pte(pte, page) {
                make pte PROT_NONE;
                flush TLBs for this virtual address;
        }
        rmap_unlock(page);
}

And in the page fault path:

if (pte_protection(pte) == PROT_NONE && PageInvalidated(pte_page_pte)) {
        clear_pte(ptep);
        page_cache_release(page);
        mm->rss--;
}

What do you think, is this simple enough that it would work ? ;)

regards,

Rik 

-- 
Bravely reimplemented by the knights who say "NIH".

http://www.surriel.com/		http://distro.conectiva.com/

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