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drm/i915: Flush tasklet submission before sleeping on i915_request_wait

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If the system is being slow and userspace is racing ahead of the GPU and
finds itself waiting for the GPU to catch up, before the process sleeps
give the tasklet a kick, bypassing ksoftirqd. If the system is
overloaded, then ksoftirqd may be delayed incurring additional latency
to our user.

This should not be a frequent problem, but in the past we have observed
several hundred millisecond delays before ksoftirqd services an
interrupt, so burn a few cycles to lend a helping hand.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191015132606.14349-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-15 14:26:06 +01:00
parent fc1a0fb538
commit 1930650240
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/i915_request.c
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@ -1496,6 +1496,7 @@ long i915_request_wait(struct i915_request *rq,
break;
}
intel_engine_flush_submission(rq->engine);
timeout = io_schedule_timeout(timeout);
}
__set_current_state(TASK_RUNNING);