On Die, 2012-01-31 at 16:59 +0000, Simon Farnsworth wrote: > Userspace currently busywaits for fences to complete; on my workload, this > busywait consumes 10% of the available CPU time. > > Provide an ioctl so that userspace can wait for an EOP interrupt that > corresponds to a previous EVENT_WRITE_EOP. > > Signed-off-by: Simon Farnsworth <simon.farnsworth@xxxxxxxxxxxx> > --- > I've been working on top of Jerome's tiling patches, so this doesn't apply > directly on top of current upstream kernels. I can easily rebase to another > version upon request - just point me to a git tree. > > My goal is to remove the sched_yield in Mesa's r600_fence_finish given up to > date enough kernel; I hope, though, that the interface is clean enough for > other users to extend it in the future (e.g. using compute rings). I'm afraid not: Unless I'm missing something, userspace can't know which ring the kernel submitted the CS to, and the kernel can't guess which ring userspace needs to wait for. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Debian, X and DRI developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
