On Wed, Jan 30, 2008 at 11:50:26AM -0800, Christoph Lameter wrote: > On Wed, 30 Jan 2008, Andrea Arcangeli wrote: > > > XPMEM requires with invalidate_range (sleepy) + > > before_invalidate_range (sleepy). invalidate_all should also be called > > before_release (both sleepy). > > > > It sounds we need full overlap of information provided by > > invalidate_page and invalidate_range to fit all three models (the > > opposite of the zero objective that current V3 is taking). And the > > swap will be handled only by invalidate_page either through linux rmap > > or external rmap (with the latter that can sleep so it's ok for you, > > the former not). GRU can safely use the either the linux rmap notifier > > or the external rmap notifier equally well, because when try_to_unmap > > is called the page is locked and obviously pinned by the VM itself. > > So put the invalidate_page() callbacks in everywhere.
The way I am envisioning it, we essentially drop back to Andrea's original patch. We then introduce a invalidate_range_begin (I was really thinking of it as invalidate_and_lock_range()) and an invalidate_range_end (again I was thinking of unlock_range). Thanks, Robin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
