From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 04/17] drm/i915: Tweak scheduler's kick_submission()
Date: Tue, 10 Mar 2020 11:47:26 +0000 [thread overview]
Message-ID: <290820b3-e797-5800-619d-0f9a6af7ceb6@linux.intel.com> (raw)
In-Reply-To: <158383803435.16414.17798608776413585801@build.alporthouse.com>
On 10/03/2020 11:00, Chris Wilson wrote:
> Quoting Tvrtko Ursulin (2020-03-10 10:07:33)
>>
>> On 06/03/2020 13:38, Chris Wilson wrote:
>>> Skip useless priority bumping on adding a new dependency, but otherwise
>>> prevent tasklet scheduling until we have completed all the potential
>>> rescheduling.
>>>
>>> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>>> ---
>>> drivers/gpu/drm/i915/i915_scheduler.c | 7 ++++++-
>>> 1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
>>> index 52f71e83e088..603cba36d6a4 100644
>>> --- a/drivers/gpu/drm/i915/i915_scheduler.c
>>> +++ b/drivers/gpu/drm/i915/i915_scheduler.c
>>> @@ -209,6 +209,8 @@ static void kick_submission(struct intel_engine_cs *engine,
>>> if (!inflight)
>>> goto unlock;
>>>
>>> + engine->execlists.queue_priority_hint = prio;
>>> +
>>
>> What is the significance of moving this up? I couldn't correlate it to
>> the commit message.
>
> It's correcting the priority bumping. If we have the same context as
> active, we should not be skipping the hint update and so avoid the useless
> bump on a later dependency.
>
>>> /*
>>> * If we are already the currently executing context, don't
>>> * bother evaluating if we should preempt ourselves.
>>> @@ -216,7 +218,6 @@ static void kick_submission(struct intel_engine_cs *engine,
>>> if (inflight->context == rq->context)
>>> goto unlock;
>>>
>>> - engine->execlists.queue_priority_hint = prio;
>>> if (need_preempt(prio, rq_prio(inflight)))
>>> tasklet_hi_schedule(&engine->execlists.tasklet);
>>>
>>> @@ -463,11 +464,15 @@ int i915_sched_node_add_dependency(struct i915_sched_node *node,
>>> if (!dep)
>>> return -ENOMEM;
>>>
>>> + local_bh_disable();
>>> +
>>> if (!__i915_sched_node_add_dependency(node, signal, dep,
>>> I915_DEPENDENCY_EXTERNAL |
>>> I915_DEPENDENCY_ALLOC))
>>> i915_dependency_free(dep);
>>>
>>> + local_bh_enable(); /* kick submission tasklet */
>>> +
>>
>> And this presumably postpones the tasklet until __bump_priority ->
>> __i915_schedule is finished. But then why the request submission path
>> which calls __i915_sched_node_add_dependency directly does not need this
>> treatment?
>
> Because we haven't completed the updates by that point, and upon actual
> request submission the tasklet is flushed. Plus on not all request
> submission paths would it be legal.
Okay,
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Regards,
Tvrtko
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
next prev parent reply other threads:[~2020-03-10 11:47 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-06 13:38 [Intel-gfx] [PATCH 01/17] drm/i915/selftests: Apply a heavy handed flush to i915_active Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 02/17] drm/i915/execlists: Enable timeslice on partial virtual engine dequeue Chris Wilson
2020-03-07 23:20 ` Sasha Levin
2020-03-06 13:38 ` [Intel-gfx] [PATCH 03/17] drm/i915: Improve the start alignment of bonded pairs Chris Wilson
2020-03-10 9:59 ` Tvrtko Ursulin
2020-03-06 13:38 ` [Intel-gfx] [PATCH 04/17] drm/i915: Tweak scheduler's kick_submission() Chris Wilson
2020-03-10 10:07 ` Tvrtko Ursulin
2020-03-10 11:00 ` Chris Wilson
2020-03-10 11:47 ` Tvrtko Ursulin [this message]
2020-03-06 13:38 ` [Intel-gfx] [PATCH 05/17] drm/i915: Wrap i915_active in a simple kreffed struct Chris Wilson
2020-03-06 14:44 ` Mika Kuoppala
2020-03-06 13:38 ` [Intel-gfx] [PATCH 06/17] drm/i915: Extend i915_request_await_active to use all timelines Chris Wilson
2020-03-10 10:18 ` Tvrtko Ursulin
2020-03-06 13:38 ` [Intel-gfx] [PATCH 07/17] drm/i915/perf: Schedule oa_config after modifying the contexts Chris Wilson
2020-03-06 14:20 ` Lionel Landwerlin
2020-03-10 11:17 ` Chris Wilson
2020-03-10 12:01 ` Lionel Landwerlin
2020-03-06 13:38 ` [Intel-gfx] [PATCH 08/17] drm/i915/selftests: Add request throughput measurement to perf Chris Wilson
2020-03-10 10:38 ` Tvrtko Ursulin
2020-03-10 11:09 ` Chris Wilson
2020-03-10 11:58 ` Tvrtko Ursulin
2020-03-10 12:06 ` Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 09/17] dma-buf: Prettify typecasts for dma-fence-chain Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 10/17] dma-buf: Report signaled links inside dma-fence-chain Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 11/17] dma-buf: Exercise dma-fence-chain under selftests Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 12/17] dma-buf: Proxy fence, an unsignaled fence placeholder Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 13/17] drm/syncobj: Allow use of dma-fence-proxy Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 14/17] drm/i915/gem: Teach execbuf how to wait on future syncobj Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 15/17] drm/i915/gem: Allow combining submit-fences with syncobj Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 16/17] drm/i915/gt: Declare when we enabled timeslicing Chris Wilson
2020-03-06 13:38 ` [Intel-gfx] [PATCH 17/17] drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore Chris Wilson
2020-03-06 14:35 ` [Intel-gfx] [PATCH 01/17] drm/i915/selftests: Apply a heavy handed flush to i915_active Mika Kuoppala
2020-03-06 21:13 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/17] " Patchwork
2020-03-06 21:33 ` [Intel-gfx] ✗ Fi.CI.DOCS: " Patchwork
2020-03-06 21:59 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=290820b3-e797-5800-619d-0f9a6af7ceb6@linux.intel.com \
--to=tvrtko.ursulin@linux.intel.com \
--cc=chris@chris-wilson.co.uk \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).