Re: [Intel-gfx] [PATCH] drm/i915: Prevent runaway head from denying hangcheck

2016-02-19 Thread Chris Wilson
On Fri, Feb 19, 2016 at 04:09:03PM +0200, Mika Kuoppala wrote: > If we have runaway head moving out of allocated address space, > that space is mapped to point into scratch page. The content of scratch > page is is zero (MI_NOOP). This leads to actual head proceeding > unhindered towards the end of

[Intel-gfx] [PATCH] drm/i915: Prevent runaway head from denying hangcheck

2016-02-19 Thread Mika Kuoppala
If we have runaway head moving out of allocated address space, that space is mapped to point into scratch page. The content of scratch page is is zero (MI_NOOP). This leads to actual head proceeding unhindered towards the end of the address space and with with 64 bit vmas it is a long walk. We cou