Quoting Daniel Vetter (2020-03-31 11:38:50) > On Tue, Mar 31, 2020 at 11:20 AM Chris Wilson <ch...@chris-wilson.co.uk> > wrote: > > Quoting Daniel Vetter (2020-03-31 10:16:18) > > > On Tue, Mar 31, 2020 at 10:59:45AM +0200, Christian König wrote: > > > > A not so gentle ping, since this pretty much broke all TTM based > > > > drivers. > > > > > > > > Could we revert this for now? > > > > > > Always ack for revert. > > > > > > Acked-by: Daniel Vetter <daniel.vet...@ffwll.ch> > > > > So you didn't check the earlier patch either? > > I did, but wasn't super sold on the idea of more flags to smack an r-b > onto it, so figured I'll throw the default ack-for-revert on this > meanwhile.
We allow userspace to poison the drm_mm at roughly 8K intervals, a search space of 35b with typically O(N^2) behaviour and each node traversal (rb_next/rb_prev) will itself be costly. Even our simple tests can generate a search of several minutes before our patience runs out.o Any drm_mm that allows for userspace to control alignment can be arbitrarily fragmented, hence a raised eyebrow that this search would be allowed in atomic context. -Chris _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
