[Intel-gfx] [PATCH v4 08/38] drm/i915: Prepare retire_requests to handle out-of-order seqnos

Chris Wilson chris at chris-wilson.co.uk
Mon Jan 11 14:10:33 PST 2016

On Mon, Jan 11, 2016 at 06:42:37PM +0000, John.C.Harrison at Intel.com wrote:
> From: John Harrison <John.C.Harrison at Intel.com>
> A major point of the GPU scheduler is that it re-orders batch buffers
> after they have been submitted to the driver. This leads to requests
> completing out of order. In turn, this means that the retire
> processing can no longer assume that all completed entries are at the
> front of the list. Rather than attempting to re-order the request list
> on a regular basis, it is better to simply scan the entire list.

This is a major misstep. Just think in terms of per-context timelines,
and retirment order within those timelines being consistent..

Chris Wilson, Intel Open Source Technology Centre

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