On Mon, Sep 26, 2016 at 05:23:29PM -0400, Rik van Riel wrote: > On Mon, 2016-09-26 at 13:58 -0700, Linus Torvalds wrote: > > > Is there really any reason for that incredible indirection? Do we > > really want to make the page_waitqueue() be a per-zone thing at all? > > Especially since all those wait-queues won't even be *used* unless > > there is actual IO going on and people are really getting into > > contention on the page lock.. Why isn't the page_waitqueue() just one > > statically sized array? > > Why are we touching file pages at all during fork()? We are not. Unless the vma has private pages (vma->anon_vma is not NULL). See first lines for copy_page_range(). We probably can go futher and skip non-private pages within file VMA. But we would need to touch struct page in this case, so it doesn't make sense. -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>