From: Tvrtko Ursulin tvrtko.ursulin@intel.com
Resurrect of the previosuly merged per client engine busyness patches. In a nutshell it enables intel_gpu_top to be more top(1) like useful and show not only physical GPU engine usage but per process view as well.
Example screen capture: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ intel-gpu-top - 906/ 955 MHz; 0% RC6; 5.30 Watts; 933 irqs/s
IMC reads: 4414 MiB/s IMC writes: 3805 MiB/s
ENGINE BUSY MI_SEMA MI_WAIT Render/3D/0 93.46% |████████████████████████████████▋ | 0% 0% Blitter/0 0.00% | | 0% 0% Video/0 0.00% | | 0% 0% VideoEnhance/0 0.00% | | 0% 0%
PID NAME Render/3D Blitter Video VideoEnhance 2733 neverball |██████▌ || || || | 2047 Xorg |███▊ || || || | 2737 glxgears |█▍ || || || | 2128 xfwm4 | || || || | 2047 Xorg | || || || | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Internally we track time spent on engines for each struct intel_context, both for current and past contexts belonging to each open DRM file.
This can serve as a building block for several features from the wanted list: smarter scheduler decisions, getrusage(2)-like per-GEM-context functionality wanted by some customers, setrlimit(2) like controls, cgroups controller, dynamic SSEU tuning, ...
To enable userspace access to the tracked data, we expose time spent on GPU per client and per engine class in sysfs with a hierarchy like the below:
# cd /sys/class/drm/card0/clients/ # tree . ├── 7 │ ├── busy │ │ ├── 0 │ │ ├── 1 │ │ ├── 2 │ │ └── 3 │ ├── name │ └── pid ├── 8 │ ├── busy │ │ ├── 0 │ │ ├── 1 │ │ ├── 2 │ │ └── 3 │ ├── name │ └── pid └── 9 ├── busy │ ├── 0 │ ├── 1 │ ├── 2 │ └── 3 ├── name └── pid
Files in 'busy' directories are numbered using the engine class ABI values and they contain accumulated nanoseconds each client spent on engines of a respective class.
Tvrtko Ursulin (7): drm/i915: Expose list of clients in sysfs drm/i915: Update client name on context create drm/i915: Make GEM contexts track DRM clients drm/i915: Track runtime spent in closed and unreachable GEM contexts drm/i915: Track all user contexts per client drm/i915: Track context current active time drm/i915: Expose per-engine client busyness
drivers/gpu/drm/i915/Makefile | 5 +- drivers/gpu/drm/i915/gem/i915_gem_context.c | 61 ++- .../gpu/drm/i915/gem/i915_gem_context_types.h | 16 +- drivers/gpu/drm/i915/gt/intel_context.c | 27 +- drivers/gpu/drm/i915/gt/intel_context.h | 15 +- drivers/gpu/drm/i915/gt/intel_context_types.h | 24 +- .../drm/i915/gt/intel_execlists_submission.c | 23 +- .../gpu/drm/i915/gt/intel_gt_clock_utils.c | 4 + drivers/gpu/drm/i915/gt/intel_lrc.c | 27 +- drivers/gpu/drm/i915/gt/intel_lrc.h | 24 ++ drivers/gpu/drm/i915/gt/selftest_lrc.c | 10 +- drivers/gpu/drm/i915/i915_drm_client.c | 365 ++++++++++++++++++ drivers/gpu/drm/i915/i915_drm_client.h | 123 ++++++ drivers/gpu/drm/i915/i915_drv.c | 6 + drivers/gpu/drm/i915/i915_drv.h | 5 + drivers/gpu/drm/i915/i915_gem.c | 21 +- drivers/gpu/drm/i915/i915_gpu_error.c | 31 +- drivers/gpu/drm/i915/i915_gpu_error.h | 2 +- drivers/gpu/drm/i915/i915_sysfs.c | 8 + 19 files changed, 716 insertions(+), 81 deletions(-) create mode 100644 drivers/gpu/drm/i915/i915_drm_client.c create mode 100644 drivers/gpu/drm/i915/i915_drm_client.h