Quoting Lionel Landwerlin (2018-10-08 16:18:20) > 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. I'm am uncomfortable with disabling preemption like this. I suggest we at least have the preemption timeout in place first. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
