This is latest iteration of GPU memory tracepoints [1]. In the past, there were questions about the "big picture" of memory accounting [2], especially given related work on dma-buf heaps and DRM cgroups [3]. Also, there was a desire for a non-driver specific solution. The great news is the dma-buf heaps work as recently landed [4]. It uses sys-fs and the plan is to use it in conjunction with the tracepoint solution [5]. We're aiming for the GPU tracepoint to calculate totals per DRM-instance (a proxy for per-process on Android) and per-DRM device. The cgroups work looks terrific too and hopefully we can deduplicate code once that's merged. Though that's abit of an implementation detail, so long as the "GPU tracepoints" + "dma-buf heap stats" plan sounds good for Android. This series modifies the GPU memory tracepoint API in a non-breaking fashion (patch 1), and adds accounting via the GEM subsystem (patches 2 --> 7). Given the multiple places where memory events happen, there's a bunch trace events scattered in various places. The hardest part is allocation, where each driver has their own API. If there's a better way, do say so. The last patch is incomplete; we would like general feedback before proceeding further. [1] https://lore.kernel.org/lkml/20200302235044.59163-1-zzyiwei@xxxxxxxxxx/ [2] https://lists.freedesktop.org/archives/dri-devel/2021-January/295120.html [3] https://www.spinics.net/lists/cgroups/msg27867.html [4] https://www.spinics.net/lists/linux-doc/msg97788.html [5] https://source.android.com/devices/graphics/implement-dma-buf-gpu-mem Gurchetan Singh (8): tracing/gpu: modify gpu_mem_total drm: add new tracepoint fields to drm_device and drm_file drm: add helper functions for gpu_mem_total and gpu_mem_instance drm: start using drm_gem_trace_gpu_mem_total drm: start using drm_gem_trace_gpu_mem_instance drm: track real and fake imports in drm_prime_member drm: trace memory import per DRM file drm: trace memory import per DRM device drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/drm_gem.c | 65 +++++++++++++++++++++++++++++++++- drivers/gpu/drm/drm_internal.h | 4 +-- drivers/gpu/drm/drm_prime.c | 22 +++++++++--- include/drm/drm_device.h | 16 +++++++++ include/drm/drm_file.h | 16 +++++++++ include/drm/drm_gem.h | 7 ++++ include/trace/events/gpu_mem.h | 61 +++++++++++++++++++++---------- 8 files changed, 166 insertions(+), 26 deletions(-) -- 2.25.1
