+
+ struct pipe_context *pipe = st->pipe;
+
+ /* Pin threads regularly to the same Zen CCX that the main thread is
+ * running on. The main thread can move between CCXs.
+ */
+ if (unlikely(HAVE_SCHED_GETCPU && /* Linux */
+ /* AMD Zen */
+ util_cpu_caps.nr_cpus != util_cpu_caps.cores_per_L3 &&
+ /* no glthread */
+ ctx->CurrentClientDispatch != ctx->MarshalExec &&
+ /* driver support */
+ pipe->set_context_param &&
+ /* do it occasionally */
+ ++st->pin_thread_counter % 512 == 0)) {
+ int cpu = sched_getcpu();
+ if (cpu >= 0) {
+ unsigned L3_cache = cpu / util_cpu_caps.cores_per_L3;
+
+ pipe->set_context_param(pipe,
+ PIPE_CONTEXT_PARAM_PIN_THREADS_TO_L3_CACHE,
+ L3_cache);
+ }
+ }