On Mon, May 05, 2014 at 05:13:18PM +0530, akash.goel@xxxxxxxxx wrote: > From: Akash Goel <akash.goel@xxxxxxxxx> > > There is a use case, when user space (display compositor) tries > to directly flip a fb (without any prior rendering) on primary > plane. So the backing pages of the object are allocated at page > flip time only, which takes time. Since, this buffer is supposed to > serve as a blanking buffer (black colored), we can setup all the GTT entries > of that blanking buffer with scratch page (which is already zeroed out). > This saves the time in allocation of real backing physical space for the > blanking buffer and flushing of CPU cache. So what happens with concurrent rendering via the GPU or GTT? And who said that scratch was blank? I wonder if there is a trivial operation in which you could grab the pages and pull it into the mappable area prior to flipping. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
