perf intel-pt: Improve sync_switch by processing PERF_RECORD_SWITCH* in events (c7b4f15f) · Commits · 戴 / test

tools/perf/util/intel-pt.c

+39 −1

Original line number	Diff line number	Diff line
		@@ -1914,6 +1914,44 @@ static int intel_pt_process_switch(struct intel_pt *pt,
		return machine__set_current_tid(pt->machine, cpu, -1, tid);
		}

		static int intel_pt_context_switch_in(struct intel_pt *pt,
		struct perf_sample *sample)
		{
		pid_t pid = sample->pid;
		pid_t tid = sample->tid;
		int cpu = sample->cpu;

		if (pt->sync_switch) {
		struct intel_pt_queue *ptq;

		ptq = intel_pt_cpu_to_ptq(pt, cpu);
		if (ptq && ptq->sync_switch) {
		ptq->next_tid = -1;
		switch (ptq->switch_state) {
		case INTEL_PT_SS_NOT_TRACING:
		case INTEL_PT_SS_UNKNOWN:
		case INTEL_PT_SS_TRACING:
		break;
		case INTEL_PT_SS_EXPECTING_SWITCH_EVENT:
		case INTEL_PT_SS_EXPECTING_SWITCH_IP:
		ptq->switch_state = INTEL_PT_SS_TRACING;
		break;
		default:
		break;
		}
		}
		}

		/*
		* If the current tid has not been updated yet, ensure it is now that
		* a "switch in" event has occurred.
		*/
		if (machine__get_current_tid(pt->machine, cpu) == tid)
		return 0;

		return machine__set_current_tid(pt->machine, cpu, pid, tid);
		}

		static int intel_pt_context_switch(struct intel_pt pt, union perf_event event,
		struct perf_sample *sample)
		{
		@@ -1925,7 +1963,7 @@ static int intel_pt_context_switch(struct intel_pt pt, union perf_event event,

		if (pt->have_sched_switch == 3) {
		if (!out)
		return 0;
		return intel_pt_context_switch_in(pt, sample);
		if (event->header.type != PERF_RECORD_SWITCH_CPU_WIDE) {
		pr_err("Expecting CPU-wide context switch event\n");
		return -EINVAL;