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drm/i915/execlists: Hesitate before slicing 

Be a little more hesitant before injecting a timeslice, and try to take
into account any change in priority that is due for the running task
before switching to another task. This will allow us to arbitrarily
prevent switching away from a request if we deem it necessarily to
disable preemption, for instance.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190703091726.11690-9-chris@chris-wilson.co.uk
alistair/sunxi64-5.4-dsi
Chris Wilson 2019-07-03 10:17:20 +01:00
parent 8221d21b06
commit ad9e3792b0
1 changed files with 1 additions and 1 deletions
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drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -899,7 +899,7 @@ need_timeslice(struct intel_engine_cs *engine, const struct i915_request *rq)
hint = max(rq_prio(list_next_entry(rq, sched.link)),
engine->execlists.queue_priority_hint);
return hint >= rq_prio(rq);
return hint >= effective_prio(rq);
}
static bool