Merge tag 'trace-tools-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing tools updates from Steven Rostedt:

 - Use total duration to calculate average in rtla osnoise_hist

 - Use 2 digit precision for displaying average

 - Print an intuitive auto analysis of timerlat results

 - Add auto analysis to timerlat top

 - Add hwnoise, which is the same as osnoise but focuses on hardware

 - Small clean ups

* tag 'trace-tools-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  Documentation/rtla: Add hwnoise man page
  rtla: Add hwnoise tool
  Documentation/rtla: Add timerlat-top auto-analysis options
  rtla/timerlat: Add auto-analysis support to timerlat top
  rtla/timerlat: Add auto-analysis core
  tools/tracing/rtla: osnoise_hist: display average with two-digit precision
  tools/tracing/rtla: osnoise_hist: use total duration for average calculation
  tools/rv: Remove unneeded semicolon

11 files changed, 1254 insertions, 22 deletions

diff --git a/tools/tracing/rtla/Makefile b/tools/tracing/rtla/Makefile
index 22e28b76f800..2456a399eb9a 100644
--- a/tools/tracing/rtla/Makefile
+++ b/tools/tracing/rtla/Makefile
@@ -119,6 +119,8 @@ install: doc_install
 	$(STRIP) $(DESTDIR)$(BINDIR)/rtla
 	@test ! -f $(DESTDIR)$(BINDIR)/osnoise || rm $(DESTDIR)$(BINDIR)/osnoise
 	ln -s rtla $(DESTDIR)$(BINDIR)/osnoise
+	@test ! -f $(DESTDIR)$(BINDIR)/hwnoise || rm $(DESTDIR)$(BINDIR)/hwnoise
+	ln -s rtla $(DESTDIR)$(BINDIR)/hwnoise
 	@test ! -f $(DESTDIR)$(BINDIR)/timerlat || rm $(DESTDIR)$(BINDIR)/timerlat
 	ln -s rtla $(DESTDIR)$(BINDIR)/timerlat
 
diff --git a/tools/tracing/rtla/src/osnoise.c b/tools/tracing/rtla/src/osnoise.c
index 4dee343909b1..3ca7a3853943 100644
--- a/tools/tracing/rtla/src/osnoise.c
+++ b/tools/tracing/rtla/src/osnoise.c
@@ -734,6 +734,113 @@ void osnoise_put_tracing_thresh(struct osnoise_context *context)
 	context->orig_tracing_thresh = OSNOISE_OPTION_INIT_VAL;
 }
 
+static int osnoise_options_get_option(char *option)
+{
+	char *options = tracefs_instance_file_read(NULL, "osnoise/options", NULL);
+	char no_option[128];
+	int retval = 0;
+	char *opt;
+
+	if (!options)
+		return OSNOISE_OPTION_INIT_VAL;
+
+	/*
+	 * Check first if the option is disabled.
+	 */
+	snprintf(no_option, sizeof(no_option), "NO_%s", option);
+
+	opt = strstr(options, no_option);
+	if (opt)
+		goto out_free;
+
+	/*
+	 * Now that it is not disabled, if the string is there, it is
+	 * enabled. If the string is not there, the option does not exist.
+	 */
+	opt = strstr(options, option);
+	if (opt)
+		retval = 1;
+	else
+		retval = OSNOISE_OPTION_INIT_VAL;
+
+out_free:
+	free(options);
+	return retval;
+}
+
+static int osnoise_options_set_option(char *option, bool onoff)
+{
+	char no_option[128];
+
+	if (onoff)
+		return tracefs_instance_file_write(NULL, "osnoise/options", option);
+
+	snprintf(no_option, sizeof(no_option), "NO_%s", option);
+
+	return tracefs_instance_file_write(NULL, "osnoise/options", no_option);
+}
+
+static int osnoise_get_irq_disable(struct osnoise_context *context)
+{
+	if (context->opt_irq_disable != OSNOISE_OPTION_INIT_VAL)
+		return context->opt_irq_disable;
+
+	if (context->orig_opt_irq_disable != OSNOISE_OPTION_INIT_VAL)
+		return context->orig_opt_irq_disable;
+
+	context->orig_opt_irq_disable = osnoise_options_get_option("OSNOISE_IRQ_DISABLE");
+
+	return context->orig_opt_irq_disable;
+}
+
+int osnoise_set_irq_disable(struct osnoise_context *context, bool onoff)
+{
+	int opt_irq_disable = osnoise_get_irq_disable(context);
+	int retval;
+
+	if (opt_irq_disable == OSNOISE_OPTION_INIT_VAL)
+		return -1;
+
+	if (opt_irq_disable == onoff)
+		return 0;
+
+	retval = osnoise_options_set_option("OSNOISE_IRQ_DISABLE", onoff);
+	if (retval < 0)
+		return -1;
+
+	context->opt_irq_disable = onoff;
+
+	return 0;
+}
+
+static void osnoise_restore_irq_disable(struct osnoise_context *context)
+{
+	int retval;
+
+	if (context->orig_opt_irq_disable == OSNOISE_OPTION_INIT_VAL)
+		return;
+
+	if (context->orig_opt_irq_disable == context->opt_irq_disable)
+		goto out_done;
+
+	retval = osnoise_options_set_option("OSNOISE_IRQ_DISABLE", context->orig_opt_irq_disable);
+	if (retval < 0)
+		err_msg("Could not restore original OSNOISE_IRQ_DISABLE option\n");
+
+out_done:
+	context->orig_opt_irq_disable = OSNOISE_OPTION_INIT_VAL;
+}
+
+static void osnoise_put_irq_disable(struct osnoise_context *context)
+{
+	osnoise_restore_irq_disable(context);
+
+	if (context->orig_opt_irq_disable == OSNOISE_OPTION_INIT_VAL)
+		return;
+
+	context->orig_opt_irq_disable = OSNOISE_OPTION_INIT_VAL;
+}
+
 /*
  * enable_osnoise - enable osnoise tracer in the trace_instance
  */
@@ -798,6 +905,9 @@ struct osnoise_context *osnoise_context_alloc(void)
 	context->orig_tracing_thresh	= OSNOISE_OPTION_INIT_VAL;
 	context->tracing_thresh		= OSNOISE_OPTION_INIT_VAL;
 
+	context->orig_opt_irq_disable	= OSNOISE_OPTION_INIT_VAL;
+	context->opt_irq_disable	= OSNOISE_OPTION_INIT_VAL;
+
 	osnoise_get_context(context);
 
 	return context;
@@ -824,6 +934,7 @@ void osnoise_put_context(struct osnoise_context *context)
 	osnoise_put_timerlat_period_us(context);
 	osnoise_put_print_stack(context);
 	osnoise_put_tracing_thresh(context);
+	osnoise_put_irq_disable(context);
 
 	free(context);
 }
@@ -958,3 +1069,9 @@ usage:
 	osnoise_usage(1);
 	exit(1);
 }
+
+int hwnoise_main(int argc, char *argv[])
+{
+	osnoise_top_main(argc, argv);
+	exit(0);
+}
diff --git a/tools/tracing/rtla/src/osnoise.h b/tools/tracing/rtla/src/osnoise.h
index 04a4384cc544..4dcf22ccd704 100644
--- a/tools/tracing/rtla/src/osnoise.h
+++ b/tools/tracing/rtla/src/osnoise.h
@@ -38,6 +38,10 @@ struct osnoise_context {
 	/* -1 as init value because 0 is disabled */
 	long long		orig_print_stack;
 	long long		print_stack;
+
+	/* -1 as init value because 0 is off */
+	int			orig_opt_irq_disable;
+	int			opt_irq_disable;
 };
 
 /*
@@ -79,6 +83,8 @@ void osnoise_restore_print_stack(struct osnoise_context *context);
 int osnoise_set_print_stack(struct osnoise_context *context,
 			    long long print_stack);
 
+int osnoise_set_irq_disable(struct osnoise_context *context, bool onoff);
+
 /*
  * osnoise_tool -  osnoise based tool definition.
  */
@@ -97,3 +103,4 @@ struct osnoise_tool *osnoise_init_trace_tool(char *tracer);
 int osnoise_hist_main(int argc, char *argv[]);
 int osnoise_top_main(int argc, char **argv);
 int osnoise_main(int argc, char **argv);
+int hwnoise_main(int argc, char **argv);
diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
index 5d7ea479ac89..13e1233690bb 100644
--- a/tools/tracing/rtla/src/osnoise_hist.c
+++ b/tools/tracing/rtla/src/osnoise_hist.c
@@ -121,6 +121,7 @@ static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu,
 {
 	struct osnoise_hist_params *params = tool->params;
 	struct osnoise_hist_data *data = tool->data;
+	unsigned long long total_duration;
 	int entries = data->entries;
 	int bucket;
 	int *hist;
@@ -131,10 +132,12 @@ static void osnoise_hist_update_multiple(struct osnoise_tool *tool, int cpu,
 	if (data->bucket_size)
 		bucket = duration / data->bucket_size;
 
+	total_duration = duration * count;
+
 	hist = data->hist[cpu].samples;
 	data->hist[cpu].count += count;
 	update_min(&data->hist[cpu].min_sample, &duration);
-	update_sum(&data->hist[cpu].sum_sample, &duration);
+	update_sum(&data->hist[cpu].sum_sample, &total_duration);
 	update_max(&data->hist[cpu].max_sample, &duration);
 
 	if (bucket < entries)
@@ -332,8 +335,8 @@ osnoise_print_summary(struct osnoise_hist_params *params,
 			continue;
 
 		if (data->hist[cpu].count)
-			trace_seq_printf(trace->seq, "%9llu ",
-					data->hist[cpu].sum_sample / data->hist[cpu].count);
+			trace_seq_printf(trace->seq, "%9.2f ",
+				((double) data->hist[cpu].sum_sample) / data->hist[cpu].count);
 		else
 			trace_seq_printf(trace->seq, "        - ");
 	}
diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 76479bfb2922..562f2e4b18c5 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -14,6 +14,11 @@
 #include "osnoise.h"
 #include "utils.h"
 
+enum osnoise_mode {
+	MODE_OSNOISE = 0,
+	MODE_HWNOISE
+};
+
 /*
  * osnoise top parameters
  */
@@ -32,6 +37,7 @@ struct osnoise_top_params {
 	int			set_sched;
 	struct sched_attr	sched_param;
 	struct trace_events	*events;
+	enum osnoise_mode	mode;
 };
 
 struct osnoise_top_cpu {
@@ -143,15 +149,23 @@ osnoise_top_handler(struct trace_seq *s, struct tep_record *record,
  */
 static void osnoise_top_header(struct osnoise_tool *top)
 {
+	struct osnoise_top_params *params = top->params;
 	struct trace_seq *s = top->trace.seq;
 	char duration[26];
 
 	get_duration(top->start_time, duration, sizeof(duration));
 
 	trace_seq_printf(s, "\033[2;37;40m");
-	trace_seq_printf(s, "                                          Operating System Noise");
-	trace_seq_printf(s, "                                     ");
-	trace_seq_printf(s, "                                     ");
+	trace_seq_printf(s, "                                          ");
+
+	if (params->mode == MODE_OSNOISE) {
+		trace_seq_printf(s, "Operating System Noise");
+		trace_seq_printf(s, "                                       ");
+	} else if (params->mode == MODE_HWNOISE) {
+		trace_seq_printf(s, "Hardware-related Noise");
+	}
+
+	trace_seq_printf(s, "                                   ");
 	trace_seq_printf(s, "\033[0;0;0m");
 	trace_seq_printf(s, "\n");
 
@@ -162,7 +176,14 @@ static void osnoise_top_header(struct osnoise_tool *top)
 	trace_seq_printf(s, "       Noise ");
 	trace_seq_printf(s, " %% CPU Aval ");
 	trace_seq_printf(s, "  Max Noise   Max Single ");
-	trace_seq_printf(s, "         HW          NMI          IRQ      Softirq       Thread");
+	trace_seq_printf(s, "         HW          NMI");
+
+	if (params->mode == MODE_HWNOISE)
+		goto eol;
+
+	trace_seq_printf(s, "          IRQ      Softirq       Thread");
+
+eol:
 	trace_seq_printf(s, "\033[0;0;0m");
 	trace_seq_printf(s, "\n");
 }
@@ -181,6 +202,7 @@ static void clear_terminal(struct trace_seq *seq)
  */
 static void osnoise_top_print(struct osnoise_tool *tool, int cpu)
 {
+	struct osnoise_top_params *params = tool->params;
 	struct trace_seq *s = tool->trace.seq;
 	struct osnoise_top_cpu *cpu_data;
 	struct osnoise_top_data *data;
@@ -205,6 +227,12 @@ static void osnoise_top_print(struct osnoise_tool *tool, int cpu)
 
 	trace_seq_printf(s, "%12llu ", cpu_data->hw_count);
 	trace_seq_printf(s, "%12llu ", cpu_data->nmi_count);
+
+	if (params->mode == MODE_HWNOISE) {
+		trace_seq_printf(s, "\n");
+		return;
+	}
+
 	trace_seq_printf(s, "%12llu ", cpu_data->irq_count);
 	trace_seq_printf(s, "%12llu ", cpu_data->softirq_count);
 	trace_seq_printf(s, "%12llu\n", cpu_data->thread_count);
@@ -241,12 +269,12 @@ osnoise_print_stats(struct osnoise_top_params *params, struct osnoise_tool *top)
 /*
  * osnoise_top_usage - prints osnoise top usage message
  */
-void osnoise_top_usage(char *usage)
+static void osnoise_top_usage(struct osnoise_top_params *params, char *usage)
 {
 	int i;
 
 	static const char * const msg[] = {
-		"  usage: rtla osnoise [top] [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
+		" [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
 		"	  [-T us] [-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
 		"	  [-c cpu-list] [-P priority]",
 		"",
@@ -277,9 +305,22 @@ void osnoise_top_usage(char *usage)
 	if (usage)
 		fprintf(stderr, "%s\n", usage);
 
-	fprintf(stderr, "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
+	if (params->mode == MODE_OSNOISE) {
+		fprintf(stderr,
+			"rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
 			VERSION);
 
+		fprintf(stderr, "  usage: rtla osnoise [top]");
+	}
+
+	if (params->mode == MODE_HWNOISE) {
+		fprintf(stderr,
+			"rtla hwnoise: a summary of hardware-related noise (version %s)\n",
+			VERSION);
+
+		fprintf(stderr, "  usage: rtla hwnoise");
+	}
+
 	for (i = 0; msg[i]; i++)
 		fprintf(stderr, "%s\n", msg[i]);
 	exit(1);
@@ -299,6 +340,9 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 	if (!params)
 		exit(1);
 
+	if (strcmp(argv[0], "hwnoise") == 0)
+		params->mode = MODE_HWNOISE;
+
 	while (1) {
 		static struct option long_options[] = {
 			{"auto",		required_argument,	0, 'a'},
@@ -345,7 +389,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'c':
 			retval = parse_cpu_list(optarg, &params->monitored_cpus);
 			if (retval)
-				osnoise_top_usage("\nInvalid -c cpu list\n");
+				osnoise_top_usage(params, "\nInvalid -c cpu list\n");
 			params->cpus = optarg;
 			break;
 		case 'D':
@@ -354,7 +398,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'd':
 			params->duration = parse_seconds_duration(optarg);
 			if (!params->duration)
-				osnoise_top_usage("Invalid -D duration\n");
+				osnoise_top_usage(params, "Invalid -D duration\n");
 			break;
 		case 'e':
 			tevent = trace_event_alloc(optarg);
@@ -370,17 +414,17 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 			break;
 		case 'h':
 		case '?':
-			osnoise_top_usage(NULL);
+			osnoise_top_usage(params, NULL);
 			break;
 		case 'p':
 			params->period = get_llong_from_str(optarg);
 			if (params->period > 10000000)
-				osnoise_top_usage("Period longer than 10 s\n");
+				osnoise_top_usage(params, "Period longer than 10 s\n");
 			break;
 		case 'P':
 			retval = parse_prio(optarg, &params->sched_param);
 			if (retval == -1)
-				osnoise_top_usage("Invalid -P priority");
+				osnoise_top_usage(params, "Invalid -P priority");
 			params->set_sched = 1;
 			break;
 		case 'q':
@@ -389,7 +433,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 		case 'r':
 			params->runtime = get_llong_from_str(optarg);
 			if (params->runtime < 100)
-				osnoise_top_usage("Runtime shorter than 100 us\n");
+				osnoise_top_usage(params, "Runtime shorter than 100 us\n");
 			break;
 		case 's':
 			params->stop_us = get_llong_from_str(optarg);
@@ -415,7 +459,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 					exit(EXIT_FAILURE);
 				}
 			} else {
-				osnoise_top_usage("--trigger requires a previous -e\n");
+				osnoise_top_usage(params, "--trigger requires a previous -e\n");
 			}
 			break;
 		case '1': /* filter */
@@ -426,11 +470,11 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 					exit(EXIT_FAILURE);
 				}
 			} else {
-				osnoise_top_usage("--filter requires a previous -e\n");
+				osnoise_top_usage(params, "--filter requires a previous -e\n");
 			}
 			break;
 		default:
-			osnoise_top_usage("Invalid option");
+			osnoise_top_usage(params, "Invalid option");
 		}
 	}
 
@@ -495,6 +539,14 @@ osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *p
 		}
 	}
 
+	if (params->mode == MODE_HWNOISE) {
+		retval = osnoise_set_irq_disable(tool->context, 1);
+		if (retval) {
+			err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n");
+			goto out_err;
+		}
+	}
+
 	return 0;
 
 out_err:
diff --git a/tools/tracing/rtla/src/rtla.c b/tools/tracing/rtla/src/rtla.c
index 52e8f1825281..7635c70123ab 100644
--- a/tools/tracing/rtla/src/rtla.c
+++ b/tools/tracing/rtla/src/rtla.c
@@ -26,6 +26,7 @@ static void rtla_usage(int err)
 		"",
 		"  commands:",
 		"     osnoise  - gives information about the operating system noise (osnoise)",
+		"     hwnoise  - gives information about hardware-related noise",
 		"     timerlat - measures the timer irq and thread latency",
 		"",
 		NULL,
@@ -47,6 +48,9 @@ int run_command(int argc, char **argv, int start_position)
 	if (strcmp(argv[start_position], "osnoise") == 0) {
 		osnoise_main(argc-start_position, &argv[start_position]);
 		goto ran;
+	} else if (strcmp(argv[start_position], "hwnoise") == 0) {
+		hwnoise_main(argc-start_position, &argv[start_position]);
+		goto ran;
 	} else if (strcmp(argv[start_position], "timerlat") == 0) {
 		timerlat_main(argc-start_position, &argv[start_position]);
 		goto ran;
diff --git a/tools/tracing/rtla/src/timerlat_aa.c b/tools/tracing/rtla/src/timerlat_aa.c
new file mode 100644
index 000000000000..ec4e0f4b0e6c
--- /dev/null
+++ b/tools/tracing/rtla/src/timerlat_aa.c
@@ -0,0 +1,990 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include "utils.h"
+#include "osnoise.h"
+#include "timerlat.h"
+
+enum timelat_state {
+	TIMERLAT_INIT = 0,
+	TIMERLAT_WAITING_IRQ,
+	TIMERLAT_WAITING_THREAD,
+};
+
+#define MAX_COMM		24
+
+/*
+ * Per-cpu data statistics and data.
+ */
+struct timerlat_aa_data {
+	/* Current CPU state */
+	int			curr_state;
+
+	/* timerlat IRQ latency */
+	unsigned long long	tlat_irq_seqnum;
+	unsigned long long	tlat_irq_latency;
+	unsigned long long	tlat_irq_timstamp;
+
+	/* timerlat Thread latency */
+	unsigned long long	tlat_thread_seqnum;
+	unsigned long long	tlat_thread_latency;
+	unsigned long long	tlat_thread_timstamp;
+
+	/*
+	 * Information about the thread running when the IRQ
+	 * arrived.
+	 *
+	 * This can be blocking or interference, depending on the
+	 * priority of the thread. Assuming timerlat is the highest
+	 * prio, it is blocking. If timerlat has a lower prio, it is
+	 * interference.
+	 * note: "unsigned long long" because they are fetch using tep_get_field_val();
+	 */
+	unsigned long long	run_thread_pid;
+	char			run_thread_comm[MAX_COMM];
+	unsigned long long	thread_blocking_duration;
+	unsigned long long	max_exit_idle_latency;
+
+	/* Information about the timerlat timer irq */
+	unsigned long long	timer_irq_start_time;
+	unsigned long long	timer_irq_start_delay;
+	unsigned long long	timer_irq_duration;
+	unsigned long long	timer_exit_from_idle;
+
+	/*
+	 * Information about the last IRQ before the timerlat irq
+	 * arrived.
+	 *
+	 * If now - timestamp is <= latency, it might have influenced
+	 * in the timerlat irq latency. Otherwise, ignore it.
+	 */
+	unsigned long long	prev_irq_duration;
+	unsigned long long	prev_irq_timstamp;
+
+	/*
+	 * Interference sum.
+	 */
+	unsigned long long	thread_nmi_sum;
+	unsigned long long	thread_irq_sum;
+	unsigned long long	thread_softirq_sum;
+	unsigned long long	thread_thread_sum;
+
+	/*
+	 * Interference task information.
+	 */
+	struct trace_seq	*prev_irqs_seq;
+	struct trace_seq	*nmi_seq;
+	struct trace_seq	*irqs_seq;
+	struct trace_seq	*softirqs_seq;
+	struct trace_seq	*threads_seq;
+	struct trace_seq	*stack_seq;
+
+	/*
+	 * Current thread.
+	 */
+	char			current_comm[MAX_COMM];
+	unsigned long long	current_pid;
+
+	/*
+	 * Is the system running a kworker?
+	 */
+	unsigned long long	kworker;
+	unsigned long long	kworker_func;
+};
+
+/*
+ * The analysis context and system wide view
+ */
+struct timerlat_aa_context {
+	int nr_cpus;
+	int dump_tasks;
+
+	/* per CPU data */
+	struct timerlat_aa_data *taa_data;
+
+	/*
+	 * required to translate function names and register
+	 * events.
+	 */
+	struct osnoise_tool *tool;
+};
+
+/*
+ * The data is stored as a local variable, but accessed via a helper function.
+ *
+ * It could be stored inside the trace context. But every access would
+ * require container_of() + a series of pointers. Do we need it? Not sure.
+ *
+ * For now keep it simple. If needed, store it in the tool, add the *context
+ * as a parameter in timerlat_aa_get_ctx() and do the magic there.
+ */
+static struct timerlat_aa_context *__timerlat_aa_ctx;
+
+static struct timerlat_aa_context *timerlat_aa_get_ctx(void)
+{
+	return __timerlat_aa_ctx;
+}
+
+/*
+ * timerlat_aa_get_data - Get the per-cpu data from the timerlat context
+ */
+static struct timerlat_aa_data
+*timerlat_aa_get_data(struct timerlat_aa_context *taa_ctx, int cpu)
+{
+	return &taa_ctx->taa_data[cpu];
+}
+
+/*
+ * timerlat_aa_irq_latency - Handles timerlat IRQ event
+ */
+static int timerlat_aa_irq_latency(struct timerlat_aa_data *taa_data,
+				   struct trace_seq *s, struct tep_record *record,
+				   struct tep_event *event)
+{
+	/*
+	 * For interference, we start now looking for things that can delay
+	 * the thread.
+	 */
+	taa_data->curr_state = TIMERLAT_WAITING_THREAD;
+	taa_data->tlat_irq_timstamp = record->ts;
+
+	/*
+	 * Zero values.
+	 */
+	taa_data->thread_nmi_sum = 0;
+	taa_data->thread_irq_sum = 0;
+	taa_data->thread_softirq_sum = 0;
+	taa_data->thread_blocking_duration = 0;
+	taa_data->timer_irq_start_time = 0;
+	taa_data->timer_irq_duration = 0;
+	taa_data->timer_exit_from_idle = 0;
+
+	/*
+	 * Zero interference tasks.
+	 */
+	trace_seq_reset(taa_data->nmi_seq);
+	trace_seq_reset(taa_data->irqs_seq);
+	trace_seq_reset(taa_data->softirqs_seq);
+	trace_seq_reset(taa_data->threads_seq);
+
+	/* IRQ latency values */
+	tep_get_field_val(s, event, "timer_latency", record, &taa_data->tlat_irq_latency, 1);
+	tep_get_field_val(s, event, "seqnum", record, &taa_data->tlat_irq_seqnum, 1);
+
+	/* The thread that can cause blocking */
+	tep_get_common_field_val(s, event, "common_pid", record, &taa_data->run_thread_pid, 1);
+
+	/*
+	 * Get exit from idle case.
+	 *
+	 * If it is not idle thread:
+	 */
+	if (taa_data->run_thread_pid)
+		return 0;
+
+	/*
+	 * if the latency is shorter than the known exit from idle:
+	 */
+	if (taa_data->tlat_irq_latency < taa_data->max_exit_idle_latency)
+		return 0;
+
+	/*
+	 * To be safe, ignore the cases in which an IRQ/NMI could have
+	 * interfered with the timerlat IRQ.
+	 */
+	if (taa_data->tlat_irq_timstamp - taa_data->tlat_irq_latency
+	    < taa_data->prev_irq_timstamp + taa_data->prev_irq_duration)
+		return 0;
+
+	taa_data->max_exit_idle_latency = taa_data->tlat_irq_latency;
+
+	return 0;
+}
+
+/*
+ * timerlat_aa_thread_latency - Handles timerlat thread event
+ */
+static int timerlat_aa_thread_latency(struct timerlat_aa_data *taa_data,
+				      struct trace_seq *s, struct tep_record *record,
+				      struct tep_event *event)
+{
+	/*
+	 * For interference, we start now looking for things that can delay
+	 * the IRQ of the next cycle.
+	 */
+	taa_data->curr_state = TIMERLAT_WAITING_IRQ;
+	taa_data->tlat_thread_timstamp = record->ts;
+
+	/* Thread latency values */
+	tep_get_field_val(s, event, "timer_latency", record, &taa_data->tlat_thread_latency, 1);
+	tep_get_field_val(s, event, "seqnum", record, &taa_data->tlat_thread_seqnum, 1);
+
+	return 0;
+}
+
+/*
+ * timerlat_aa_handler - Handle timerlat events
+ *
+ * This function is called to handle timerlat events recording statistics.
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int timerlat_aa_handler(struct trace_seq *s, struct tep_record *record,
+			struct tep_event *event, void *context)
+{
+	struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx();
+	struct timerlat_aa_data *taa_data = timerlat_aa_get_data(taa_ctx, record->cpu);
+	unsigned long long thread;
+
+	if (!taa_data)
+		return -1;
+
+	tep_get_field_val(s, event, "context", record, &thread, 1);
+	if (!thread)
+		return timerlat_aa_irq_latency(taa_data, s, record, event);
+	else
+		return timerlat_aa_thread_latency(taa_data, s, record, event);
+}
+
+/*
+ * timerlat_aa_nmi_handler - Handles NMI noise
+ *
+ * It is used to collect information about interferences from NMI. It is
+ * hooked to the osnoise:nmi_noise event.
+ */
+static int timerlat_aa_nmi_handler(struct trace_seq *s, struct tep_record *record,
+				   struct tep_event *event, void *context)
+{
+	struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx();
+	struct timerlat_aa_data *taa_data = timerlat_aa_get_data(taa_ctx, record->cpu);
+	unsigned long long duration;
+	unsigned long long start;
+
+	tep_get_field_val(s, event, "duration", record, &duration, 1);
+	tep_get_field_val(s, event, "start", record, &start, 1);
+
+	if (taa_data->curr_state == TIMERLAT_WAITING_IRQ) {
+		taa_data->prev_irq_duration = duration;
+		taa_data->prev_irq_timstamp = start;
+
+		trace_seq_reset(taa_data->prev_irqs_seq);
+		trace_seq_printf(taa_data->prev_irqs_seq, "\t%24s	\t\t\t%9.2f us\n",
+			 "nmi", ns_to_usf(duration));
+		return 0;
+	}
+
+	taa_data->thread_nmi_sum += duration;
+	trace_seq_printf(taa_data->nmi_seq, "	%24s	\t\t\t%9.2f us\n",
+		 "nmi", ns_to_usf(duration));
+
+	return 0;
+}
+
+/*
+ * timerlat_aa_irq_handler - Handles IRQ noise
+ *
+ * It is used to collect information about interferences from IRQ. It is
+ * hooked to the osnoise:irq_noise event.
+ *
+ * It is a little bit more complex than the other because it measures:
+ *	- The IRQs that can delay the timer IRQ before it happened.
+ *	- The Timerlat IRQ handler
+ *	- The IRQs that happened between the timerlat IRQ and the timerlat thread
+ *	  (IRQ interference).
+ */
+static int timerlat_aa_irq_handler(struct trace_seq *s, struct tep_record *record,
+				   struct tep_event *event, void *context)
+{
+	struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx();
+	struct timerlat_aa_data *taa_data = timerlat_aa_get_data(taa_ctx, record->cpu);
+	unsigned long long expected_start;
+	unsigned long long duration;
+	unsigned long long vector;
+	unsigned long long start;
+	char *desc;
+	int val;
+
+	tep_get_field_val(s, event, "duration", record, &duration, 1);
+	tep_get_field_val(s, event, "start", record, &start, 1);
+	tep_get_field_val(s, event, "vector", record, &vector, 1);
+	desc = tep_get_field_raw(s, event, "desc", record, &val, 1);
+
+	/*
+	 * Before the timerlat IRQ.
+	 */
+	if (taa_data->curr_state == TIMERLAT_WAITING_IRQ) {
+		taa_data->prev_irq_duration = duration;
+		taa_data->prev_irq_timstamp = start;
+
+		trace_seq_reset(taa_data->prev_irqs_seq);
+		trace_seq_printf(taa_data->prev_irqs_seq, "\t%24s:%-3llu	\t\t%9.2f us\n",
+				 desc, vector, ns_to_usf(duration));
+		return 0;
+	}
+
+	/*
+	 * The timerlat IRQ: taa_data->timer_irq_start_time is zeroed at
+	 * the timerlat irq handler.
+	 */
+	if (!taa_data->timer_irq_start_time) {
+		expected_start = taa_data->tlat_irq_timstamp - taa_data->tlat_irq_latency;
+
+		taa_data->timer_irq_start_time = start;
+		taa_data->timer_irq_duration = duration;
+
+		taa_data->timer_irq_start_delay = taa_data->timer_irq_start_time - expected_start;
+
+		/*
+		 * not exit from idle.
+		 */
+		if (taa_data->run_thread_pid)
+			return 0;
+
+		if (expected_start > taa_data->prev_irq_timstamp + taa_data->prev_irq_duration)
+			taa_data->timer_exit_from_idle = taa_data->timer_irq_start_delay;
+
+		return 0;
+	}
+
+	/*
+	 * IRQ interference.
+	 */
+	taa_data->thread_irq_sum += duration;
+	trace_seq_printf(taa_data->irqs_seq, "	%24s:%-3llu	\t	%9.2f us\n",
+			 desc, vector, ns_to_usf(duration));
+
+	return 0;
+}
+
+static char *softirq_name[] = { "HI", "TIMER",	"NET_TX", "NET_RX", "BLOCK",
+				"IRQ_POLL", "TASKLET", "SCHED", "HRTIMER", "RCU" };
+
+
+/*
+ * timerlat_aa_softirq_handler - Handles Softirq noise
+ *
+ * It is used to collect information about interferences from Softirq. It is
+ * hooked to the osnoise:softirq_noise event.
+ *
+ * It is only printed in the non-rt kernel, as softirqs become thread on RT.
+ */
+static int timerlat_aa_softirq_handler(struct trace_seq *s, struct tep_record *record,
+				       struct tep_event *event, void *context)
+{
+	struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx();
+	struct timerlat_aa_data *taa_data = timerlat_aa_get_data(taa_ctx, record->cpu);
+	unsigned long long duration;
+	unsigned long long vector;
+	unsigned long long start;
+
+	if (taa_data->curr_state == TIMERLAT_WAITING_IRQ)
+		return 0;
+
+	tep_get_field_val(s, event, "duration", record, &duration, 1);
+	tep_get_field_val(s, event, "start", record, &start, 1);
+	tep_get_field_val(s, event, "vector", record, &vector, 1);
+
+	taa_data->thread_softirq_sum += duration;
+
+	trace_seq_printf(taa_data->softirqs_seq, "\t%24s:%-3llu	\t	%9.2f us\n",
+			 softirq_name[vector], vector, ns_to_usf(duration));
+	return 0;
+}
+
+/*
+ * timerlat_aa_softirq_handler - Handles thread noise
+ *
+ * It is used to collect information about interferences from threads. It is
+ * hooked to the osnoise:thread_noise event.
+ *
+ * Note: if you see thread noise, your timerlat thread was not the highest prio one.
+ */
+static int timerlat_aa_thread_handler(struct trace_seq *s, struct tep_record *record,
+				      struct tep_event *event, void *context)
+{
+	struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx();
+	struct timerlat_aa_data *taa_data = timerlat_aa_get_data(taa_ctx, record->cpu);
+	unsigned long long duration;
+	unsigned long long start;
+	unsigned long long pid;
+	const char *comm;
+	int val;
+
+	if (taa_data->curr_state == TIMERLAT_WAITING_IRQ)
+		return 0;
+
+	tep_get_field_val(s, event, "duration", record, &duration, 1);
+	tep_get_field_val(s, event, "start", record, &start, 1);
+
+	tep_get_common_field_val(s, event, "common_pid", record, &pid, 1);
+	comm = tep_get_field_raw(s, event, "comm", record, &val, 1);
+
+	if (pid == taa_data->run_thread_pid && !taa_data->thread_blocking_duration) {
+		taa_data->thread_blocking_duration = duration;
+
+		if (comm)
+			strncpy(taa_data->run_thread_comm, comm, MAX_COMM);
+		else
+			sprintf(taa_data->run_thread_comm, "<...>");
+
+	} else {
+		taa_data->thread_thread_sum += duration;
+
+		trace_seq_printf(taa_data->threads_seq, "\t%24s:%-3llu	\t\t%9.2f us\n",
+			 comm, pid, ns_to_usf(duration));
+	}
+
+	return 0;
+}
+
+/*
+ * timerlat_aa_stack_handler - Handles timerlat IRQ stack trace
+ *
+ * Saves and parse the stack trace generated by the timerlat IRQ.
+ */
+static int timerlat_aa_stack_handler(struct trace_seq *s, struct tep_record *record,
+			      struct tep_event *event, void *context)
+{
+	struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx();
+	struct timerlat_aa_data *taa_data = timerlat_aa_get_data(taa_ctx, record->cpu);
+	unsigned long *caller;
+	const char *function;
+	int val, i;
+
+	trace_seq_reset(taa_data->stack_seq);
+
+	trace_seq_printf(taa_data->stack_seq, "    Blocking thread stack trace\n");
+	caller = tep_get_field_raw(s, event, "caller", record, &val, 1);
+	if (caller) {
+		for (i = 0; ; i++) {
+			function = tep_find_function(taa_ctx->tool->trace.tep, caller[i]);
+			if (!function)
+				break;
+			trace_seq_printf(taa_data->stack_seq, "\t\t-> %s\n", function);
+		}
+	}
+	return 0;
+}
+
+/*
+ * timerlat_aa_sched_switch_handler - Tracks the current thread running on the CPU
+ *
+ * Handles the sched:sched_switch event to