[Intel-gfx] [PATCH 2/2] drm/i915: Move execlists port head instead of memmoving array

[Chris Wilson]

Quoting Mika Kuoppala (2017-11-30 09:10:28)
> From: Mika Kuoppala <mika.kuoppala at intel.com>
> 
> As all our access to execlist ports are through head and tail
> helpers, we can now move the head instead of memmoving the array.
> 
> v2: use memset (Chris)
> 
> Cc: Michał Winiarski <michal.winiarski at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

This patch:
add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-58 (-58)
function                                     old     new   delta
execlists_cancel_port_requests               299     288     -11
guc_submission_tasklet                      1660    1643     -17
execlists_submission_tasklet                2245    2215     -30

Overall:
add/remove: 0/0 grow/shrink: 4/2 up/down: 322/-2 (320)
function                                     old     new   delta
guc_submission_tasklet                      1488    1643    +155
execlists_submission_tasklet                2129    2215     +86
intel_engine_dump                           2234    2281     +47
execlists_cancel_port_requests               254     288     +34
intel_engine_init_cmd_parser                1134    1133      -1
capture                                     5700    5699      -1

Better. Still room for improvement, 2215 bytes worth :)
-Chris