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drm/i915: Note the addition of timeslicing to the pretend scheduler

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Since writing the comment that the scheduler is entirely passive, we've
added minimal timeslicing which adds the most primitive of active
elements (a timeout and reschedule).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191010071434.31195-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-10 08:14:25 +01:00
parent da80f04792
commit 9c4a14f8cc
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/i915_scheduler_types.h
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@ -49,6 +49,15 @@ struct i915_sched_attr {
* DAG of each request, we are able to insert it into a sorted queue when it
* is ready, and are able to reorder its portion of the graph to accommodate
* dynamic priority changes.
*
* Ok, there is now one active element to the "scheduler" in the backends.
* We let a new context run for a small amount of time before re-evaluating
* the run order. As we re-evaluate, we maintain the strict ordering of
* dependencies, but attempt to rotate the active contexts (the current context
* is put to the back of its priority queue, then reshuffling its dependents).
* This provides minimal timeslicing and prevents a userspace hog (e.g.
* something waiting on a user semaphore [VkEvent]) from denying service to
* others.
*/
struct i915_sched_node {
struct list_head signalers_list; /* those before us, we depend upon */