On Mon, Jan 21, 2019, at 4:20 PM, Chris Wilson wrote: > Rather than every backend and GPU driver reinventing the same wheel for > user level debugging of HW execution, the common dma-fence framework > should include the tracing infrastructure required for most client API > level flow visualisation. > > With these common dma-fence level tracepoints, the userspace tools can > establish a detailed view of the client <-> HW flow across different > kernels. There is a strong ask to have this available, so that the > userspace developer can effectively assess if they're doing a good job > about feeding the beast of a GPU hardware. ... I've got a first pass of this visualizing with gpuvis. Screenshots: ; with dma_event tracepoints patch https://imgur.com/a/MwvoAYY ; with old i915 tracepoints https://imgur.com/a/tG2iyHS Couple questions... With your new dma_event traceponts patch, we're still getting these tracepoints: i915_request_in i915_request_out intel_engine_notify And the in/out tracepoints line up with dma_fence_executes (same ctx:seqno and time): <idle>-0 [006] 150.376273: dma_fence_execute_start: context=31, seqno=35670, hwid=0 <idle>-0 [006] 150.413215: dma_fence_execute_end: context=31, seqno=35670, hwid=0 <idle>-0 [006] 150.376272: i915_request_in: dev=0, engine=0:0, hw_id=4, ctx=31, seqno=35670, prio=0, global=41230, port=1 <idle>-0 [006] 150.413217: i915_request_out: dev=0, engine=0:0, hw_id=4, ctx=31, seqno=35670, global=41230, completed?=1 However I'm also seeing several i915_request_in --> intel_engine_notify tracepoints that don't have dma_fence_execute_* tracepoints: RenderThread-1279 [001] 150.341336: dma_fence_init: driver=i915 timeline=ShooterGame[1226]/2 context=31 seqno=35669 RenderThread-1279 [001] 150.341352: dma_fence_emit: context=31, seqno=35669 <idle>-0 [006] 150.376271: i915_request_in: dev=0, engine=0:0, hw_id=4, ctx=31, seqno=35669, prio=0, global=41229, port=1 <idle>-0 [006] 150.411525: intel_engine_notify: dev=0, engine=0:0, seqno=41229, waiters=1 RenderThread-1279 [001] 150.419779: dma_fence_signaled: context=31, seqno=35669 RenderThread-1279 [001] 150.419838: dma_fence_destroy: context=31, seqno=35669 I assume something is going on at a lower level that we can't get the information for via dma_fence? Thanks! _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
