From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Per-engine queue depths are an interesting metric for analyzing the system load and also for users who wish to use it to load balance their submissions based on it. In this version I have split the metrics into three separate counters: 1. SUBMITTED - From execbuf time to request being runnable - meaning dependencies have been resolved and fences signaled. 2. QUEUED - From runnable to running on the GPU. 3. RUNNING - Running on the GPU. When inspected with perf stat the output looks roughly like this: # time counts unit events 201.160490145 0.01 i915/rcs0-submitted/ 201.160490145 19.13 i915/rcs0-queued/ 201.160490145 2.39 i915/rcs0-running/ The reported numbers are average queue depths for the last query period. Having split out metrics should be more flexible for all users, and it is still possible to fetch an atomic snapshot of all using the perf groups for those wanting to combine them. For users wanting instantanous numbers instead of averaged, we could potentially expose them using the query API Lionel is working on. (https://patchwork.freedesktop.org/series/36622/) For instance a query packet could look like: #define DRM_I915_QUERY_ENGINE_QUEUES 0x04 struct drm_i915_query_engine_queues { __u8 class; __u8 instance __u8 pad[2]; __u32 submitted; __u32 queued; __u32 running; }; I also have patches to expose this via intel-gpu-top, using the perf API. Tvrtko Ursulin (6): drm/i915/pmu: Fix enable count array size and bounds checking drm/i915: Keep a count of requests waiting for a slot on GPU drm/i915: Keep a count of requests submitted from userspace drm/i915/pmu: Add queued counter drm/i915/pmu: Add submitted counter drm/i915/pmu: Add running counter drivers/gpu/drm/i915/i915_gem_request.c | 10 +++++ drivers/gpu/drm/i915/i915_pmu.c | 67 +++++++++++++++++++++++++++++---- drivers/gpu/drm/i915/intel_engine_cs.c | 6 ++- drivers/gpu/drm/i915/intel_lrc.c | 2 + drivers/gpu/drm/i915/intel_ringbuffer.h | 19 +++++++++- include/uapi/drm/i915_drm.h | 18 ++++++++- 6 files changed, 109 insertions(+), 13 deletions(-) -- 2.14.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
