Messages in this thread | | | Date | Wed, 23 Jun 2004 18:04:01 +0900 | From | IWAMOTO Toshihiro <> | Subject | Re: Atomic operation for physically moving a page (for memory defragmentation) |
| |
At Fri, 18 Jun 2004 21:25:38 -0700, Dave Hansen wrote: > I think what you really want to do is keep anybody else from making a > new pte to the page, once you've invalidated all of the existing ones, > right? > > Holding a lock_page() should do the trick. Anybody that goes any pulls > the page out of the page cache has to do a lock_page() and check > page->mapping before they can establish a pte to it, so you can stop > that. Since you're invalidating page->mapping before you move the page > (you *are* doing this, right?), it will end up working itself out.
This isn't true unless the PG_uptodate bit of the page isn't cleared, and properly doing that isn't so simple.
I'm planning to post a new version of my memory hotplug patch, but the page migration code currently doesn't work well with linux-2.6.7.
-- IWAMOTO Toshihiro
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |