On Tue, Dec 04, 2007 at 10:54:51AM +0100, Christian Borntraeger wrote: > Am Dienstag, 4. Dezember 2007 schrieb Nick Piggin: > [...] > > There is one slight downside -- direct block device access and filesystem > > metadata access goes through an extra copy and gets stored in RAM twice. > > However, this downside is only slight, because the real buffercache of the > > device is now reclaimable (because we're not playing crazy games with it), > > so under memory intensive situations, footprint should effectively be the > > same -- maybe even a slight advantage to the new driver because it can also > > reclaim buffer heads. > > This is just an idea, I dont know if it is worth the trouble, but have you > though about implementing direct_access for brd? That would allow > execute-in-place (xip) on brd eliminating the extra copy. Actually that's a pretty good idea. It would allow xip to be tested without special hardware as well... I'll see what the patch looks like. Thanks - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
