Messages in this thread |  | | Date | Thu, 12 Sep 2002 19:30:11 -0300 (BRT) | From | Rik van Riel <> | Subject | Re: invalidate_inode_pages in 2.5.32/3 |
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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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