rtla/timerlat: Add auto-analysis core

Currently, timerlat displays a summary of the timerlat tracer results
saving the trace if the system hits a stop condition.

While this represented a huge step forward, the root cause was not
that is accessible to non-expert users.

The auto-analysis fulfill this gap by parsing the trace timerlat runs,
printing an intuitive auto-analysis.

Link: https://lkml.kernel.org/r/1ee073822f6a2cbb33da0c817331d0d4045e837f.1675179318.git.bristot@kernel.org

Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

tools/tracing/rtla/src/timerlat_aa.h

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+
+int timerlat_aa_init(struct osnoise_tool *tool, int nr_cpus, int dump_task);
+void timerlat_aa_destroy(void);
+
+int timerlat_aa_handler(struct trace_seq *s, struct tep_record *record,
+			struct tep_event *event, void *context);
+
+void timerlat_auto_analysis(int irq_thresh, int thread_thresh);

tools/tracing/rtla/src/utils.h

@@ -56,3 +56,6 @@ struct sched_attr {
 int parse_prio(char *arg, struct sched_attr *sched_param);
 int set_comm_sched_attr(const char *comm_prefix, struct sched_attr *attr);
 int set_cpu_dma_latency(int32_t latency);
+
+#define ns_to_usf(x) (((double)x/1000))
+#define ns_to_per(total, part) ((part * 100) / (double)total)