diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-15 14:26:06 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-10-15 16:42:47 +0100 |
| commit | 193065024072c0d6f2972142d5df5a00b33324c6 (patch) | |
| tree | 66f60f1d50485b6a7aa14f0cbf44dc348d001052 | |
| parent | fc1a0fb53875724c3498e1402ac339de3fee20d8 (diff) | |
drm/i915: Flush tasklet submission before sleeping on i915_request_wait
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
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index b8a54572a4f8..f1cadad4e81c 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -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); |