On Fri, Mar 3, 2023 at 1:58 AM Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com> wrote: > > > On 03/03/2023 03:21, Rodrigo Vivi wrote: > > On Thu, Mar 02, 2023 at 03:53:37PM -0800, Rob Clark wrote: > >> From: Rob Clark <robdcl...@chromium.org> > >> > > > > missing some wording here... > > > >> v2: rebase > >> > >> Signed-off-by: Rob Clark <robdcl...@chromium.org> > >> --- > >> drivers/gpu/drm/i915/i915_request.c | 20 ++++++++++++++++++++ > >> 1 file changed, 20 insertions(+) > >> > >> diff --git a/drivers/gpu/drm/i915/i915_request.c > >> b/drivers/gpu/drm/i915/i915_request.c > >> index 7503dcb9043b..44491e7e214c 100644 > >> --- a/drivers/gpu/drm/i915/i915_request.c > >> +++ b/drivers/gpu/drm/i915/i915_request.c > >> @@ -97,6 +97,25 @@ static bool i915_fence_enable_signaling(struct > >> dma_fence *fence) > >> return i915_request_enable_breadcrumb(to_request(fence)); > >> } > >> > >> +static void i915_fence_set_deadline(struct dma_fence *fence, ktime_t > >> deadline) > >> +{ > >> + struct i915_request *rq = to_request(fence); > >> + > >> + if (i915_request_completed(rq)) > >> + return; > >> + > >> + if (i915_request_started(rq)) > >> + return; > > > > why do we skip the boost if already started? > > don't we want to boost the freq anyway? > > I'd wager Rob is just copying the current i915 wait boost logic.
Yup, and probably incorrectly.. Matt reported fewer boosts/sec compared to your RFC, this could be the bug > >> + > >> + /* > >> + * TODO something more clever for deadlines that are in the > >> + * future. I think probably track the nearest deadline in > >> + * rq->timeline and set timer to trigger boost accordingly? > >> + */ > > > > I'm afraid it will be very hard to find some heuristics of what's > > late enough for the boost no? > > I mean, how early to boost the freq on an upcoming deadline for the > > timer? > > We can off load this patch from Rob and deal with it separately, or > after the fact? That is completely my intention, I expect you to replace my i915 patch ;-) Rough idea when everyone is happy with the core bits is to setup an immutable branch without the driver specific patches, which could be merged into drm-next and $driver-next and then each driver team can add there own driver patches on top BR, -R > It's a half solution without a smarter scheduler too. Like > https://lore.kernel.org/all/20210208105236.28498-10-ch...@chris-wilson.co.uk/, > or if GuC plans to do something like that at any point. > > Or bump the priority too if deadline is looming? > > IMO it is not very effective to fiddle with the heuristic on an ad-hoc > basis. For instance I have a new heuristics which improves the > problematic OpenCL cases for further 5% (relative to the current > waitboost improvement from adding missing syncobj waitboost). But I > can't really test properly for regressions over platforms, stacks, > workloads.. :( > > Regards, > > Tvrtko > > > > >> + > >> + intel_rps_boost(rq); > >> +} > >> + > >> static signed long i915_fence_wait(struct dma_fence *fence, > >> bool interruptible, > >> signed long timeout) > >> @@ -182,6 +201,7 @@ const struct dma_fence_ops i915_fence_ops = { > >> .signaled = i915_fence_signaled, > >> .wait = i915_fence_wait, > >> .release = i915_fence_release, > >> + .set_deadline = i915_fence_set_deadline, > >> }; > >> > >> static void irq_execute_cb(struct irq_work *wrk) > >> -- > >> 2.39.1 > >>