On Mon, Mar 17, 2014 at 10:48:32PM -0700, Ben Widawsky wrote: > Okay, so what does this do? > The patch series /dynamicizes/ page table allocation and teardown for > GEN7. It also starts to introduce GEN8, but the tricky stuff is still > not done. Up until now, all our page tables are pre-allocated when the > address space is created. That's actually okay for current GENs since we > don't use many address spaces, and the page tables occupy only 2MB each. > However, on GEN8 we can use a deeper page table, and to preallocate such > an address space would be very costly. This work was done for GEN7 first > because this is the most well tested with full PPGTT, and stable > platforms are readily available. > > In this patch series, I've demonstrated how we will manage tracking used > page tables (bitmaps), and broken things out into much more discrete > functions. I'm hoping I'll get feedback on the way I've implemented > things (primarily if it seems fundamentally flawed in any way). The real > goal was to prove out the dynamic allocation so we can begin to enable > GEN8 in the same way. I'll emphasize now that I put in a lot of effort > limit risk with each patch, and this does result in some excess churn. I like it. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
