Quoting Lionel Landwerlin (2019-07-09 10:32:06) > We would like to make use of perf in Vulkan. The Vulkan API is much > lower level than OpenGL, with applications directly exposed to the > concept of command buffers (pretty much equivalent to our batch > buffers). In Vulkan, queries are always limited in scope to a command > buffer. In OpenGL, the lack of command buffer concept meant that > queries' duration could span multiple command buffers. > > With that restriction gone in Vulkan, we would like to simplify > measuring performance just by measuring the deltas between the counter > snapshots written by 2 MI_RECORD_PERF_COUNT commands, rather than the > more complex scheme we currently have in the GL driver, using 2 > MI_RECORD_PERF_COUNT commands and doing some post processing on the > stream of OA reports, coming from the global OA buffer, to remove any > unrelated deltas in between the 2 MI_RECORD_PERF_COUNT. > > Disabling preemption only apply to a single context with which want to > query performance counters for and is considered a privileged > operation, by default protected by CAP_SYS_ADMIN. It is possible to > enable it for a normal user by disabling the paranoid stream setting. > > v2: Store preemption setting in intel_context (Chris) > > v3: Use priorities to avoid preemption rather than the HW mechanism > > v4: Just modify the port priority reporting function > > Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx> > Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Could you split this into two -- separate the backend mechanism from perf setting the flag? I want to add a selftest and apply. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
