On Mon, Dec 01, 2014 at 12:33:15PM +0100, Cornelia Huck wrote: > On Mon, 1 Dec 2014 11:26:58 +0200 > "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote: > > > For some places on data path, it might be worth it > > to cache the correct value e.g. as part of device > > structure. This replaces a branch with a memory load, > > so the gain would have to be measured, best done > > separately? > > I think we'll want to do some measuring once the basic structure is > in place anyway. What's meant by in place here? > We should make sure that e.g. s390 only takes minor > hit due to all that swapping that is needed for standard-compliant > devices. Caching the value might certainly help in some paths. Well, this is queued in linux-next for 3.19, so now's the time to do it :) -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
