On Tue, Nov 24, 2015 at 09:39:33AM -0500, Chuck Lever wrote: > >> Do we really want to go down that road? It seems like we've decided > >> in general that while the protocol specs say MR must be unmapped before > >> proceeding with the data that is painful enough to ignore this > >> requirement. E.g. iser for example only does the local invalidate > >> just before reusing the MR. > > That leaves the MR exposed to the remote indefinitely. If > the MR is registered for remote write, that seems hazardous. Agree. If we have a performance knob it should be to post the invalidate, then immediately dma unmap and start using the buffer, not to defer the invalidate potentially indefinitely. Then it is just a race to be exploited not a long lived window into random page cache memory. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
