On Tue, Feb 19, 2008 at 07:46:10PM +1100, Nick Piggin wrote: > On Sunday 17 February 2008 06:22, Christoph Lameter wrote: > > On Fri, 15 Feb 2008, Andrew Morton wrote: > > > > > flush_cache_page(vma, address, pte_pfn(*pte)); > > > > entry = ptep_clear_flush(vma, address, pte); > > > > + mmu_notifier(invalidate_page, mm, address); > > > > > > I just don't see how ths can be done if the callee has another thread in > > > the middle of establishing IO against this region of memory. > > > ->invalidate_page() _has_ to be able to block. Confused. > > > > The page lock is held and that holds off I/O? > > I think the actual answer is that "it doesn't matter".
Agreed. The PG_lock itself taken when invalidate_page is called, is used to serialized the VM against the VM, not the VM against I/O. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
