drm/i915: Priority boost for waiting clients

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Latency is in the eye of the beholder. In the case where a client stops
and waits for the gpu, give that request chain a small priority boost
(not so that it overtakes higher priority clients, to preserve the
external ordering) so that ideally the wait completes earlier.

v2: Tvrtko recommends to keep the boost-from-user-stall as small as
possible and to allow new client flows to be preferred for interactivity
over stalls.

Testcase: igt/gem_sync/switch-default
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181001144755.7978-3-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2018-10-01 15:47:55 +01:00

parent e2f3496e93

commit e9eaf82d97

5 changed files with 42 additions and 11 deletions

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5

drivers/gpu/drm/i915/i915_gem.c

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2

drivers/gpu/drm/i915/i915_request.c

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5

drivers/gpu/drm/i915/i915_request.h

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34

drivers/gpu/drm/i915/i915_scheduler.c

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7

drivers/gpu/drm/i915/i915_scheduler.h

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