On Friday 13 September 2002 00:30, Rik van Riel wrote:
> 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 ? ;)
This is very promising. Actually, we'd only need to do that for
pages that are currently skipped in invalidate_inode_pages. Have
to think about possible interactions now...
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