On Thu, Jul 30, 2015 at 08:05:07AM +0100, Chris Wilson wrote: > On Sun, Jun 28, 2015 at 09:19:26AM +0100, Chris Wilson wrote: > > The old style of memory interleaving swizzled upto the end of the > > first even bank of memory, and then used the remainder as unswizzled on > > the unpaired bank - i.e. swizzling is not constant for all memory. This > > causes problems when we try to migrate memory and so the kernel prevents > > migration at all when we detect L-shaped inconsistent swizzling. > > However, this issue also extends to userspace who try to manually detile > > into memory as the swizzling for an individual page is unknown (it > > depends on its physical address only known to the kernel), userspace > > cannot correctly swizzle. > > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91105 > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > > Cc: stable@xxxxxxxxxxxxxxx > > Daniel since you dropped v2 and had already reviewed this version, it > would have been useful had you done the swap... Simply forgot, sorry. I added a note about the earlier attempt and also one to explain that cc: stable is for fixing up wc mmaps. Picked up for -fixes, thanks for the patch. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
