Quoting Joonas Lahtinen (2018-05-18 11:05:36)
> Quoting Chris Wilson (2018-05-13 10:50:09)
> > To no surprise (since we've flip-flopped over the use of PIN_HIGH a few
> > times), doing a search by address over a pathologically fragmented
> > address space is exceeding slow. To protect ourselves from nearly
> > unbounded latency (think searching a million holes while under
> > struct_mutex), limit the search for the highest available hole and
> > fallback to best-fit if it fails.
> > 
> > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> > Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
> 
> Some testcase or measurement to quote before merging?

igt/gem_ctx_thrash goes from hours to seconds.
-Chris
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