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-rw-r--r--tools/tracing/rtla/src/timerlat_top.c935
1 files changed, 935 insertions, 0 deletions
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
new file mode 100644
index 000000000000..29c2c1f717ed
--- /dev/null
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -0,0 +1,935 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+
+#define _GNU_SOURCE
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <time.h>
+#include <errno.h>
+#include <sched.h>
+#include <pthread.h>
+
+#include "timerlat.h"
+#include "timerlat_aa.h"
+#include "timerlat_bpf.h"
+
+struct timerlat_top_cpu {
+ unsigned long long irq_count;
+ unsigned long long thread_count;
+ unsigned long long user_count;
+
+ unsigned long long cur_irq;
+ unsigned long long min_irq;
+ unsigned long long sum_irq;
+ unsigned long long max_irq;
+
+ unsigned long long cur_thread;
+ unsigned long long min_thread;
+ unsigned long long sum_thread;
+ unsigned long long max_thread;
+
+ unsigned long long cur_user;
+ unsigned long long min_user;
+ unsigned long long sum_user;
+ unsigned long long max_user;
+};
+
+struct timerlat_top_data {
+ struct timerlat_top_cpu *cpu_data;
+ int nr_cpus;
+};
+
+/*
+ * timerlat_free_top - free runtime data
+ */
+static void timerlat_free_top(struct timerlat_top_data *data)
+{
+ free(data->cpu_data);
+ free(data);
+}
+
+static void timerlat_free_top_tool(struct osnoise_tool *tool)
+{
+ timerlat_free_top(tool->data);
+ timerlat_free(tool);
+}
+
+/*
+ * timerlat_alloc_histogram - alloc runtime data
+ */
+static struct timerlat_top_data *timerlat_alloc_top(int nr_cpus)
+{
+ struct timerlat_top_data *data;
+ int cpu;
+
+ data = calloc(1, sizeof(*data));
+ if (!data)
+ return NULL;
+
+ data->nr_cpus = nr_cpus;
+
+ /* one set of histograms per CPU */
+ data->cpu_data = calloc(1, sizeof(*data->cpu_data) * nr_cpus);
+ if (!data->cpu_data)
+ goto cleanup;
+
+ /* set the min to max */
+ for (cpu = 0; cpu < nr_cpus; cpu++) {
+ data->cpu_data[cpu].min_irq = ~0;
+ data->cpu_data[cpu].min_thread = ~0;
+ data->cpu_data[cpu].min_user = ~0;
+ }
+
+ return data;
+
+cleanup:
+ timerlat_free_top(data);
+ return NULL;
+}
+
+static void
+timerlat_top_reset_sum(struct timerlat_top_cpu *summary)
+{
+ memset(summary, 0, sizeof(*summary));
+ summary->min_irq = ~0;
+ summary->min_thread = ~0;
+ summary->min_user = ~0;
+}
+
+static void
+timerlat_top_update_sum(struct osnoise_tool *tool, int cpu, struct timerlat_top_cpu *sum)
+{
+ struct timerlat_top_data *data = tool->data;
+ struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
+
+ sum->irq_count += cpu_data->irq_count;
+ update_min(&sum->min_irq, &cpu_data->min_irq);
+ update_sum(&sum->sum_irq, &cpu_data->sum_irq);
+ update_max(&sum->max_irq, &cpu_data->max_irq);
+
+ sum->thread_count += cpu_data->thread_count;
+ update_min(&sum->min_thread, &cpu_data->min_thread);
+ update_sum(&sum->sum_thread, &cpu_data->sum_thread);
+ update_max(&sum->max_thread, &cpu_data->max_thread);
+
+ sum->user_count += cpu_data->user_count;
+ update_min(&sum->min_user, &cpu_data->min_user);
+ update_sum(&sum->sum_user, &cpu_data->sum_user);
+ update_max(&sum->max_user, &cpu_data->max_user);
+}
+
+/*
+ * timerlat_hist_update - record a new timerlat occurent on cpu, updating data
+ */
+static void
+timerlat_top_update(struct osnoise_tool *tool, int cpu,
+ unsigned long long thread,
+ unsigned long long latency)
+{
+ struct timerlat_params *params = to_timerlat_params(tool->params);
+ struct timerlat_top_data *data = tool->data;
+ struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
+
+ if (params->common.output_divisor)
+ latency = latency / params->common.output_divisor;
+
+ if (!thread) {
+ cpu_data->irq_count++;
+ cpu_data->cur_irq = latency;
+ update_min(&cpu_data->min_irq, &latency);
+ update_sum(&cpu_data->sum_irq, &latency);
+ update_max(&cpu_data->max_irq, &latency);
+ } else if (thread == 1) {
+ cpu_data->thread_count++;
+ cpu_data->cur_thread = latency;
+ update_min(&cpu_data->min_thread, &latency);
+ update_sum(&cpu_data->sum_thread, &latency);
+ update_max(&cpu_data->max_thread, &latency);
+ } else {
+ cpu_data->user_count++;
+ cpu_data->cur_user = latency;
+ update_min(&cpu_data->min_user, &latency);
+ update_sum(&cpu_data->sum_user, &latency);
+ update_max(&cpu_data->max_user, &latency);
+ }
+}
+
+/*
+ * timerlat_top_handler - this is the handler for timerlat tracer events
+ */
+static int
+timerlat_top_handler(struct trace_seq *s, struct tep_record *record,
+ struct tep_event *event, void *context)
+{
+ struct trace_instance *trace = context;
+ unsigned long long latency, thread;
+ struct osnoise_tool *top;
+ int cpu = record->cpu;
+
+ top = container_of(trace, struct osnoise_tool, trace);
+
+ if (!top->params->aa_only) {
+ tep_get_field_val(s, event, "context", record, &thread, 1);
+ tep_get_field_val(s, event, "timer_latency", record, &latency, 1);
+
+ timerlat_top_update(top, cpu, thread, latency);
+ }
+
+ return 0;
+}
+
+/*
+ * timerlat_top_bpf_pull_data - copy data from BPF maps into userspace
+ */
+static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
+{
+ struct timerlat_top_data *data = tool->data;
+ int i, err;
+ long long value_irq[data->nr_cpus],
+ value_thread[data->nr_cpus],
+ value_user[data->nr_cpus];
+
+ /* Pull summary */
+ err = timerlat_bpf_get_summary_value(SUMMARY_CURRENT,
+ value_irq, value_thread, value_user,
+ data->nr_cpus);
+ if (err)
+ return err;
+ for (i = 0; i < data->nr_cpus; i++) {
+ data->cpu_data[i].cur_irq = value_irq[i];
+ data->cpu_data[i].cur_thread = value_thread[i];
+ data->cpu_data[i].cur_user = value_user[i];
+ }
+
+ err = timerlat_bpf_get_summary_value(SUMMARY_COUNT,
+ value_irq, value_thread, value_user,
+ data->nr_cpus);
+ if (err)
+ return err;
+ for (i = 0; i < data->nr_cpus; i++) {
+ data->cpu_data[i].irq_count = value_irq[i];
+ data->cpu_data[i].thread_count = value_thread[i];
+ data->cpu_data[i].user_count = value_user[i];
+ }
+
+ err = timerlat_bpf_get_summary_value(SUMMARY_MIN,
+ value_irq, value_thread, value_user,
+ data->nr_cpus);
+ if (err)
+ return err;
+ for (i = 0; i < data->nr_cpus; i++) {
+ data->cpu_data[i].min_irq = value_irq[i];
+ data->cpu_data[i].min_thread = value_thread[i];
+ data->cpu_data[i].min_user = value_user[i];
+ }
+
+ err = timerlat_bpf_get_summary_value(SUMMARY_MAX,
+ value_irq, value_thread, value_user,
+ data->nr_cpus);
+ if (err)
+ return err;
+ for (i = 0; i < data->nr_cpus; i++) {
+ data->cpu_data[i].max_irq = value_irq[i];
+ data->cpu_data[i].max_thread = value_thread[i];
+ data->cpu_data[i].max_user = value_user[i];
+ }
+
+ err = timerlat_bpf_get_summary_value(SUMMARY_SUM,
+ value_irq, value_thread, value_user,
+ data->nr_cpus);
+ if (err)
+ return err;
+ for (i = 0; i < data->nr_cpus; i++) {
+ data->cpu_data[i].sum_irq = value_irq[i];
+ data->cpu_data[i].sum_thread = value_thread[i];
+ data->cpu_data[i].sum_user = value_user[i];
+ }
+
+ return 0;
+}
+
+/*
+ * timerlat_top_header - print the header of the tool output
+ */
+static void timerlat_top_header(struct timerlat_params *params, struct osnoise_tool *top)
+{
+ struct trace_seq *s = top->trace.seq;
+ bool pretty = params->common.pretty_output;
+ char duration[26];
+
+ get_duration(top->start_time, duration, sizeof(duration));
+
+ if (pretty)
+ trace_seq_printf(s, "\033[2;37;40m");
+
+ trace_seq_printf(s, " Timer Latency ");
+ if (params->common.user_data)
+ trace_seq_printf(s, " ");
+
+ if (pretty)
+ trace_seq_printf(s, "\033[0;0;0m");
+ trace_seq_printf(s, "\n");
+
+ trace_seq_printf(s, "%-6s | IRQ Timer Latency (%s) | Thread Timer Latency (%s)", duration,
+ params->common.output_divisor == 1 ? "ns" : "us",
+ params->common.output_divisor == 1 ? "ns" : "us");
+
+ if (params->common.user_data) {
+ trace_seq_printf(s, " | Ret user Timer Latency (%s)",
+ params->common.output_divisor == 1 ? "ns" : "us");
+ }
+
+ trace_seq_printf(s, "\n");
+ if (pretty)
+ trace_seq_printf(s, "\033[2;30;47m");
+
+ trace_seq_printf(s, "CPU COUNT | cur min avg max | cur min avg max");
+ if (params->common.user_data)
+ trace_seq_printf(s, " | cur min avg max");
+
+ if (pretty)
+ trace_seq_printf(s, "\033[0;0;0m");
+ trace_seq_printf(s, "\n");
+}
+
+static const char *no_value = " -";
+
+/*
+ * timerlat_top_print - prints the output of a given CPU
+ */
+static void timerlat_top_print(struct osnoise_tool *top, int cpu)
+{
+ struct timerlat_params *params = to_timerlat_params(top->params);
+ struct timerlat_top_data *data = top->data;
+ struct timerlat_top_cpu *cpu_data = &data->cpu_data[cpu];
+ struct trace_seq *s = top->trace.seq;
+
+ /*
+ * Skip if no data is available: is this cpu offline?
+ */
+ if (!cpu_data->irq_count && !cpu_data->thread_count)
+ return;
+
+ /*
+ * Unless trace is being lost, IRQ counter is always the max.
+ */
+ trace_seq_printf(s, "%3d #%-9llu |", cpu, cpu_data->irq_count);
+
+ if (!cpu_data->irq_count) {
+ trace_seq_printf(s, "%s %s %s %s |", no_value, no_value, no_value, no_value);
+ } else {
+ trace_seq_printf(s, "%9llu ", cpu_data->cur_irq);
+ trace_seq_printf(s, "%9llu ", cpu_data->min_irq);
+ trace_seq_printf(s, "%9llu ", cpu_data->sum_irq / cpu_data->irq_count);
+ trace_seq_printf(s, "%9llu |", cpu_data->max_irq);
+ }
+
+ if (!cpu_data->thread_count) {
+ trace_seq_printf(s, "%s %s %s %s", no_value, no_value, no_value, no_value);
+ } else {
+ trace_seq_printf(s, "%9llu ", cpu_data->cur_thread);
+ trace_seq_printf(s, "%9llu ", cpu_data->min_thread);
+ trace_seq_printf(s, "%9llu ",
+ cpu_data->sum_thread / cpu_data->thread_count);
+ trace_seq_printf(s, "%9llu", cpu_data->max_thread);
+ }
+
+ if (!params->common.user_data) {
+ trace_seq_printf(s, "\n");
+ return;
+ }
+
+ trace_seq_printf(s, " |");
+
+ if (!cpu_data->user_count) {
+ trace_seq_printf(s, "%s %s %s %s\n", no_value, no_value, no_value, no_value);
+ } else {
+ trace_seq_printf(s, "%9llu ", cpu_data->cur_user);
+ trace_seq_printf(s, "%9llu ", cpu_data->min_user);
+ trace_seq_printf(s, "%9llu ",
+ cpu_data->sum_user / cpu_data->user_count);
+ trace_seq_printf(s, "%9llu\n", cpu_data->max_user);
+ }
+}
+
+/*
+ * timerlat_top_print_sum - prints the summary output
+ */
+static void
+timerlat_top_print_sum(struct osnoise_tool *top, struct timerlat_top_cpu *summary)
+{
+ const char *split = "----------------------------------------";
+ struct timerlat_params *params = to_timerlat_params(top->params);
+ unsigned long long count = summary->irq_count;
+ struct trace_seq *s = top->trace.seq;
+ int e = 0;
+
+ /*
+ * Skip if no data is available: is this cpu offline?
+ */
+ if (!summary->irq_count && !summary->thread_count)
+ return;
+
+ while (count > 999999) {
+ e++;
+ count /= 10;
+ }
+
+ trace_seq_printf(s, "%.*s|%.*s|%.*s", 15, split, 40, split, 39, split);
+ if (params->common.user_data)
+ trace_seq_printf(s, "-|%.*s", 39, split);
+ trace_seq_printf(s, "\n");
+
+ trace_seq_printf(s, "ALL #%-6llu e%d |", count, e);
+
+ if (!summary->irq_count) {
+ trace_seq_printf(s, " %s %s %s |", no_value, no_value, no_value);
+ } else {
+ trace_seq_printf(s, " ");
+ trace_seq_printf(s, "%9llu ", summary->min_irq);
+ trace_seq_printf(s, "%9llu ", summary->sum_irq / summary->irq_count);
+ trace_seq_printf(s, "%9llu |", summary->max_irq);
+ }
+
+ if (!summary->thread_count) {
+ trace_seq_printf(s, "%s %s %s %s", no_value, no_value, no_value, no_value);
+ } else {
+ trace_seq_printf(s, " ");
+ trace_seq_printf(s, "%9llu ", summary->min_thread);
+ trace_seq_printf(s, "%9llu ",
+ summary->sum_thread / summary->thread_count);
+ trace_seq_printf(s, "%9llu", summary->max_thread);
+ }
+
+ if (!params->common.user_data) {
+ trace_seq_printf(s, "\n");
+ return;
+ }
+
+ trace_seq_printf(s, " |");
+
+ if (!summary->user_count) {
+ trace_seq_printf(s, " %s %s %s |", no_value, no_value, no_value);
+ } else {
+ trace_seq_printf(s, " ");
+ trace_seq_printf(s, "%9llu ", summary->min_user);
+ trace_seq_printf(s, "%9llu ",
+ summary->sum_user / summary->user_count);
+ trace_seq_printf(s, "%9llu\n", summary->max_user);
+ }
+}
+
+/*
+ * clear_terminal - clears the output terminal
+ */
+static void clear_terminal(struct trace_seq *seq)
+{
+ if (!config_debug)
+ trace_seq_printf(seq, "\033c");
+}
+
+/*
+ * timerlat_print_stats - print data for all cpus
+ */
+static void
+timerlat_print_stats(struct osnoise_tool *top)
+{
+ struct timerlat_params *params = to_timerlat_params(top->params);
+ struct trace_instance *trace = &top->trace;
+ struct timerlat_top_cpu summary;
+ static int nr_cpus = -1;
+ int i;
+
+ if (params->common.aa_only)
+ return;
+
+ if (nr_cpus == -1)
+ nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
+
+ if (!params->common.quiet)
+ clear_terminal(trace->seq);
+
+ timerlat_top_reset_sum(&summary);
+
+ timerlat_top_header(params, top);
+
+ for_each_monitored_cpu(i, nr_cpus, &params->common) {
+ timerlat_top_print(top, i);
+ timerlat_top_update_sum(top, i, &summary);
+ }
+
+ timerlat_top_print_sum(top, &summary);
+
+ trace_seq_do_printf(trace->seq);
+ trace_seq_reset(trace->seq);
+ osnoise_report_missed_events(top);
+}
+
+/*
+ * timerlat_top_usage - prints timerlat top usage message
+ */
+static void timerlat_top_usage(void)
+{
+ int i;
+
+ static const char *const msg[] = {
+ "",
+ " usage: rtla timerlat [top] [-h] [-q] [-a us] [-d s] [-D] [-n] [-p us] [-i us] [-T us] [-s us] \\",
+ " [[-t [file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
+ " [-P priority] [--dma-latency us] [--aa-only us] [-C [cgroup_name]] [-u|-k] [--warm-up s] [--deepest-idle-state n]",
+ "",
+ " -h/--help: print this menu",
+ " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
+ " --aa-only us: stop if <us> latency is hit, only printing the auto analysis (reduces CPU usage)",
+ " -p/--period us: timerlat period in us",
+ " -i/--irq us: stop trace if the irq latency is higher than the argument in us",
+ " -T/--thread us: stop trace if the thread latency is higher than the argument in us",
+ " -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
+ " -c/--cpus cpus: run the tracer only on the given cpus",
+ " -H/--house-keeping cpus: run rtla control threads only on the given cpus",
+ " -C/--cgroup [cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
+ " -d/--duration time[s|m|h|d]: duration of the session",
+ " -D/--debug: print debug info",
+ " --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)",
+ " -t/--trace [file]: save the stopped trace to [file|timerlat_trace.txt]",
+ " -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
+ " --filter <command>: enable a trace event filter to the previous -e event",
+ " --trigger <command>: enable a trace event trigger to the previous -e event",
+ " -n/--nano: display data in nanoseconds",
+ " --no-aa: disable auto-analysis, reducing rtla timerlat cpu usage",
+ " -q/--quiet print only a summary at the end",
+ " --dma-latency us: set /dev/cpu_dma_latency latency <us> to reduce exit from idle latency",
+ " -P/--priority o:prio|r:prio|f:prio|d:runtime:period : set scheduling parameters",
+ " o:prio - use SCHED_OTHER with prio",
+ " r:prio - use SCHED_RR with prio",
+ " f:prio - use SCHED_FIFO with prio",
+ " d:runtime[us|ms|s]:period[us|ms|s] - use SCHED_DEADLINE with runtime and period",
+ " in nanoseconds",
+ " -u/--user-threads: use rtla user-space threads instead of kernel-space timerlat threads",
+ " -k/--kernel-threads: use timerlat kernel-space threads instead of rtla user-space threads",
+ " -U/--user-load: enable timerlat for user-defined user-space workload",
+ " --warm-up s: let the workload run for s seconds before collecting data",
+ " --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
+ " --deepest-idle-state n: only go down to idle state n on cpus used by timerlat to reduce exit from idle latency",
+ " --on-threshold <action>: define action to be executed at latency threshold, multiple are allowed",
+ " --on-end: define action to be executed at measurement end, multiple are allowed",
+ NULL,
+ };
+
+ fprintf(stderr, "rtla timerlat top: a per-cpu summary of the timer latency (version %s)\n",
+ VERSION);
+
+ for (i = 0; msg[i]; i++)
+ fprintf(stderr, "%s\n", msg[i]);
+
+ exit(EXIT_SUCCESS);
+}
+
+/*
+ * timerlat_top_parse_args - allocs, parse and fill the cmd line parameters
+ */
+static struct common_params
+*timerlat_top_parse_args(int argc, char **argv)
+{
+ struct timerlat_params *params;
+ struct trace_events *tevent;
+ long long auto_thresh;
+ int retval;
+ int c;
+ char *trace_output = NULL;
+
+ params = calloc(1, sizeof(*params));
+ if (!params)
+ exit(1);
+
+ actions_init(&params->common.threshold_actions);
+ actions_init(&params->common.end_actions);
+
+ /* disabled by default */
+ params->dma_latency = -1;
+
+ /* disabled by default */
+ params->deepest_idle_state = -2;
+
+ /* display data in microseconds */
+ params->common.output_divisor = 1000;
+
+ /* default to BPF mode */
+ params->mode = TRACING_MODE_BPF;
+
+ while (1) {
+ static struct option long_options[] = {
+ {"auto", required_argument, 0, 'a'},
+ {"cpus", required_argument, 0, 'c'},
+ {"cgroup", optional_argument, 0, 'C'},
+ {"debug", no_argument, 0, 'D'},
+ {"duration", required_argument, 0, 'd'},
+ {"event", required_argument, 0, 'e'},
+ {"help", no_argument, 0, 'h'},
+ {"house-keeping", required_argument, 0, 'H'},
+ {"irq", required_argument, 0, 'i'},
+ {"nano", no_argument, 0, 'n'},
+ {"period", required_argument, 0, 'p'},
+ {"priority", required_argument, 0, 'P'},
+ {"quiet", no_argument, 0, 'q'},
+ {"stack", required_argument, 0, 's'},
+ {"thread", required_argument, 0, 'T'},
+ {"trace", optional_argument, 0, 't'},
+ {"user-threads", no_argument, 0, 'u'},
+ {"kernel-threads", no_argument, 0, 'k'},
+ {"user-load", no_argument, 0, 'U'},
+ {"trigger", required_argument, 0, '0'},
+ {"filter", required_argument, 0, '1'},
+ {"dma-latency", required_argument, 0, '2'},
+ {"no-aa", no_argument, 0, '3'},
+ {"dump-tasks", no_argument, 0, '4'},
+ {"aa-only", required_argument, 0, '5'},
+ {"warm-up", required_argument, 0, '6'},
+ {"trace-buffer-size", required_argument, 0, '7'},
+ {"deepest-idle-state", required_argument, 0, '8'},
+ {"on-threshold", required_argument, 0, '9'},
+ {"on-end", required_argument, 0, '\1'},
+ {0, 0, 0, 0}
+ };
+
+ c = getopt_long(argc, argv, "a:c:C::d:De:hH:i:knp:P:qs:t::T:uU0:1:2:345:6:7:",
+ long_options, NULL);
+
+ /* detect the end of the options. */
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 'a':
+ auto_thresh = get_llong_from_str(optarg);
+
+ /* set thread stop to auto_thresh */
+ params->common.stop_total_us = auto_thresh;
+ params->common.stop_us = auto_thresh;
+
+ /* get stack trace */
+ params->print_stack = auto_thresh;
+
+ /* set trace */
+ if (!trace_output)
+ trace_output = "timerlat_trace.txt";
+
+ break;
+ case '5':
+ /* it is here because it is similar to -a */
+ auto_thresh = get_llong_from_str(optarg);
+
+ /* set thread stop to auto_thresh */
+ params->common.stop_total_us = auto_thresh;
+ params->common.stop_us = auto_thresh;
+
+ /* get stack trace */
+ params->print_stack = auto_thresh;
+
+ /* set aa_only to avoid parsing the trace */
+ params->common.aa_only = 1;
+ break;
+ case 'c':
+ retval = parse_cpu_set(optarg, &params->common.monitored_cpus);
+ if (retval)
+ fatal("Invalid -c cpu list");
+ params->common.cpus = optarg;
+ break;
+ case 'C':
+ params->common.cgroup = 1;
+ params->common.cgroup_name = optarg;
+ break;
+ case 'D':
+ config_debug = 1;
+ break;
+ case 'd':
+ params->common.duration = parse_seconds_duration(optarg);
+ if (!params->common.duration)
+ fatal("Invalid -d duration");
+ break;
+ case 'e':
+ tevent = trace_event_alloc(optarg);
+ if (!tevent)
+ fatal("Error alloc trace event");
+
+ if (params->common.events)
+ tevent->next = params->common.events;
+ params->common.events = tevent;
+ break;
+ case 'h':
+ case '?':
+ timerlat_top_usage();
+ break;
+ case 'H':
+ params->common.hk_cpus = 1;
+ retval = parse_cpu_set(optarg, &params->common.hk_cpu_set);
+ if (retval)
+ fatal("Error parsing house keeping CPUs");
+ break;
+ case 'i':
+ params->common.stop_us = get_llong_from_str(optarg);
+ break;
+ case 'k':
+ params->common.kernel_workload = true;
+ break;
+ case 'n':
+ params->common.output_divisor = 1;
+ break;
+ case 'p':
+ params->timerlat_period_us = get_llong_from_str(optarg);
+ if (params->timerlat_period_us > 1000000)
+ fatal("Period longer than 1 s");
+ break;
+ case 'P':
+ retval = parse_prio(optarg, &params->common.sched_param);
+ if (retval == -1)
+ fatal("Invalid -P priority");
+ params->common.set_sched = 1;
+ break;
+ case 'q':
+ params->common.quiet = 1;
+ break;
+ case 's':
+ params->print_stack = get_llong_from_str(optarg);
+ break;
+ case 'T':
+ params->common.stop_total_us = get_llong_from_str(optarg);
+ break;
+ case 't':
+ trace_output = parse_optional_arg(argc, argv);
+ if (!trace_output)
+ trace_output = "timerlat_trace.txt";
+ break;
+ case 'u':
+ params->common.user_workload = true;
+ /* fallback: -u implies -U */
+ case 'U':
+ params->common.user_data = true;
+ break;
+ case '0': /* trigger */
+ if (params->common.events) {
+ retval = trace_event_add_trigger(params->common.events, optarg);
+ if (retval)
+ fatal("Error adding trigger %s", optarg);
+ } else {
+ fatal("--trigger requires a previous -e");
+ }
+ break;
+ case '1': /* filter */
+ if (params->common.events) {
+ retval = trace_event_add_filter(params->common.events, optarg);
+ if (retval)
+ fatal("Error adding filter %s", optarg);
+ } else {
+ fatal("--filter requires a previous -e");
+ }
+ break;
+ case '2': /* dma-latency */
+ params->dma_latency = get_llong_from_str(optarg);
+ if (params->dma_latency < 0 || params->dma_latency > 10000)
+ fatal("--dma-latency needs to be >= 0 and < 10000");
+ break;
+ case '3': /* no-aa */
+ params->no_aa = 1;
+ break;
+ case '4':
+ params->dump_tasks = 1;
+ break;
+ case '6':
+ params->common.warmup = get_llong_from_str(optarg);
+ break;
+ case '7':
+ params->common.buffer_size = get_llong_from_str(optarg);
+ break;
+ case '8':
+ params->deepest_idle_state = get_llong_from_str(optarg);
+ break;
+ case '9':
+ retval = actions_parse(&params->common.threshold_actions, optarg,
+ "timerlat_trace.txt");
+ if (retval)
+ fatal("Invalid action %s", optarg);
+ break;
+ case '\1':
+ retval = actions_parse(&params->common.end_actions, optarg,
+ "timerlat_trace.txt");
+ if (retval)
+ fatal("Invalid action %s", optarg);
+ break;
+ default:
+ fatal("Invalid option");
+ }
+ }
+
+ if (trace_output)
+ actions_add_trace_output(&params->common.threshold_actions, trace_output);
+
+ if (geteuid())
+ fatal("rtla needs root permission");
+
+ /*
+ * Auto analysis only happens if stop tracing, thus:
+ */
+ if (!params->common.stop_us && !params->common.stop_total_us)
+ params->no_aa = 1;
+
+ if (params->no_aa && params->common.aa_only)
+ fatal("--no-aa and --aa-only are mutually exclusive!");
+
+ if (params->common.kernel_workload && params->common.user_workload)
+ fatal("--kernel-threads and --user-threads are mutually exclusive!");
+
+ /*
+ * If auto-analysis or trace output is enabled, switch from BPF mode to
+ * mixed mode
+ */
+ if (params->mode == TRACING_MODE_BPF &&
+ (params->common.threshold_actions.present[ACTION_TRACE_OUTPUT] ||
+ params->common.end_actions.present[ACTION_TRACE_OUTPUT] ||
+ !params->no_aa))
+ params->mode = TRACING_MODE_MIXED;
+
+ return &params->common;
+}
+
+/*
+ * timerlat_top_apply_config - apply the top configs to the initialized tool
+ */
+static int
+timerlat_top_apply_config(struct osnoise_tool *top)
+{
+ struct timerlat_params *params = to_timerlat_params(top->params);
+ int retval;
+
+ retval = timerlat_apply_config(top, params);
+ if (retval)
+ goto out_err;
+
+ if (isatty(STDOUT_FILENO) && !params->common.quiet)
+ params->common.pretty_output = 1;
+
+ return 0;
+
+out_err:
+ return -1;
+}
+
+/*
+ * timerlat_init_top - initialize a timerlat top tool with parameters
+ */
+static struct osnoise_tool
+*timerlat_init_top(struct common_params *params)
+{
+ struct osnoise_tool *top;
+ int nr_cpus;
+
+ nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
+
+ top = osnoise_init_tool("timerlat_top");
+ if (!top)
+ return NULL;
+
+ top->data = timerlat_alloc_top(nr_cpus);
+ if (!top->data)
+ goto out_err;
+
+ tep_register_event_handler(top->trace.tep, -1, "ftrace", "timerlat",
+ timerlat_top_handler, top);
+
+ return top;
+
+out_err:
+ osnoise_destroy_tool(top);
+ return NULL;
+}
+
+/*
+ * timerlat_top_bpf_main_loop - main loop to process events (BPF variant)
+ */
+static int
+timerlat_top_bpf_main_loop(struct osnoise_tool *tool)
+{
+ struct timerlat_params *params = to_timerlat_params(tool->params);
+ int retval, wait_retval;
+
+ if (params->common.aa_only) {
+ /* Auto-analysis only, just wait for stop tracing */
+ timerlat_bpf_wait(-1);
+ return 0;
+ }
+
+ /* Pull and display data in a loop */
+ while (!stop_tracing) {
+ wait_retval = timerlat_bpf_wait(params->common.quiet ? -1 :
+ params->common.sleep_time);
+
+ retval = timerlat_top_bpf_pull_data(tool);
+ if (retval) {
+ err_msg("Error pulling BPF data\n");
+ return retval;
+ }
+
+ if (!params->common.quiet)
+ timerlat_print_stats(tool);
+
+ if (wait_retval != 0) {
+ /* Stopping requested by tracer */
+ actions_perform(&params->common.threshold_actions);
+
+ if (!params->common.threshold_actions.continue_flag)
+ /* continue flag not set, break */
+ break;
+
+ /* continue action reached, re-enable tracing */
+ if (tool->record)
+ trace_instance_start(&tool->record->trace);
+ if (tool->aa)
+ trace_instance_start(&tool->aa->trace);
+ timerlat_bpf_restart_tracing();
+ }
+
+ /* is there still any user-threads ? */
+ if (params->common.user_workload) {
+ if (params->common.user.stopped_running) {
+ debug_msg("timerlat user space threads stopped!\n");
+ break;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int timerlat_top_main_loop(struct osnoise_tool *tool)
+{
+ struct timerlat_params *params = to_timerlat_params(tool->params);
+ int retval;
+
+ if (params->mode == TRACING_MODE_TRACEFS) {
+ retval = top_main_loop(tool);
+ } else {
+ retval = timerlat_top_bpf_main_loop(tool);
+ timerlat_bpf_detach();
+ }
+
+ return retval;
+}
+
+struct tool_ops timerlat_top_ops = {
+ .tracer = "timerlat",
+ .comm_prefix = "timerlat/",
+ .parse_args = timerlat_top_parse_args,
+ .init_tool = timerlat_init_top,
+ .apply_config = timerlat_top_apply_config,
+ .enable = timerlat_enable,
+ .main = timerlat_top_main_loop,
+ .print_stats = timerlat_print_stats,
+ .analyze = timerlat_analyze,
+ .free = timerlat_free_top_tool,
+};
generated by cgit (git 2.34.1) at 2025-12-25 20:25:56 +0000