On Wed, 2015-08-26 at 11:25 +0200, Daniel Vetter wrote: > On Mon, Aug 24, 2015 at 05:28:13PM +0530, ankitprasad.r.sharma@xxxxxxxxx wrote: > > From: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx> > > > > We are trying to reduce the time for which the global 'struct_mutex' > > is locked. Execbuffer ioctl is one place where it is generally held > > for the longest time. And sometimes because of this occasional > > glitches/flickers are observed in 60 fps playback (due to miss of > > V-blank intervals) as page flip calls gets blocked/delayed because the > > 'struct_mutex' is already locked. > > > > For this, we have exposed two new flags in GEM_CREATE ioctl, to pre-populate > > the object with system memory pages and also do an immediate clflush for the > > new pages. > > > > The third patch too tries to reduce the 'struct_mutex' lock time by > > moving only those objects to CPU domain in put_pages(), that can either > > be used in the future or had a CPU mapping. > > > > This series is based on an earlier series of Stolen Memory patches, > > extending the GEM_CREATE ioctl further > > http://lists.freedesktop.org/archives/intel-gfx/2015-July/072199.html > > > > Ankitprasad Sharma (2): > > drm/i915: Support for pre-populating the object with system pages > > drm/i915: Support for the clflush of pre-populated pages > > > > Chris Wilson (1): > > drm/i915: Only move to the CPU write domain if keeping the GTT pages > > Usual broken maintainer record: Needs igt and userspace. And for the case > of the put_pages optimization probably really nasty igt. Yes, the igt is work in progress. We will extend the gem_create igt for 1st two patches and we are trying to come up with a new igt for the case of put_pages optimization. Also a query regarding the userspace, Where to do the userspace changes? (mesa driver?) and Who should do the implementation? (Should we do it?) Thanks, Ankit _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
