On Mon, Jul 31, 2017 at 09:42:06AM +0200, Christoph Hellwig wrote:
On Mon, Jul 31, 2017 at 04:36:47PM +0900, Minchan Kim wrote:
> Do you suggest define something special flag(e.g., SWP_INMEMORY)
> for in-memory swap to swap_info_struct when swapon time manually
> or from bdi_queue_someting automatically?
> And depending the flag of swap_info_struct, use the onstack bio
> instead of dynamic allocation if the swap device is in-memory?
Currently swap always just does I/O on a single page as far
as I can tell, so it can always just use an on-stack bio and
That's for synchronous I/O, aka reads of course. For writes you'll
need to do a dynamic allocation if they are asynchronous. But yes,
if we want to force certain devices to be synchronous we'll need
a flag for that.