[Bug 87726] [BDW Bisected] OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87726

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
There are a number of patches to address this, with review outstanding. The
regression here is due to the large number of context and list entries
generated by OglDrvCtx. The patches try to compensate by making context
creation quicker (the goal of that particular microbenchmark) and introduce
hashtables to avoid the linear list walks.

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