diff options
Diffstat (limited to 'tools/tracing')
| -rw-r--r-- | tools/tracing/rtla/Makefile | 2 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/osnoise.c | 117 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/osnoise.h | 7 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/osnoise_hist.c | 9 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/osnoise_top.c | 84 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/rtla.c | 4 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/timerlat_aa.c | 990 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/timerlat_aa.h | 12 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/timerlat_top.c | 46 | ||||
| -rw-r--r-- | tools/tracing/rtla/src/utils.h | 3 |
10 files changed, 1253 insertions, 21 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, ¶ms->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, ¶ms->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 trace the current thread running on the + * CPU. It is used to display the threads running on the other CPUs when the trace + * stops. + */ +static int timerlat_aa_sched_switch_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); + const char *comm; + int val; + + tep_get_field_val(s, event, "next_pid", record, &taa_data->current_pid, 1); + comm = tep_get_field_raw(s, event, "next_comm", record, &val, 1); + + strncpy(taa_data->current_comm, comm, MAX_COMM); + + /* + * If this was a kworker, clean the last kworkers that ran. + */ + taa_data->kworker = 0; + taa_data->kworker_func = 0; + + return 0; +} + +/* + * timerlat_aa_kworker_start_handler - Tracks a kworker running on the CPU + * + * Handles workqueue:workqueue_execute_start event, keeping track of + * the job that a kworker could be doing in the CPU. + * + * We already catch problems of hardware related latencies caused by work queues + * running driver code that causes hardware stall. For example, with DRM drivers. + */ +static int timerlat_aa_kworker_start_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); + + tep_get_field_val(s, event, "work", record, &taa_data->kworker, 1); + tep_get_field_val(s, event, "function", record, &taa_data->kworker_func, 1); + return 0; +} + +/* + * timerlat_thread_analysis - Prints the analysis of a CPU that hit a stop tracing + * + * This is the core of the analysis. + */ +static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, + int irq_thresh, int thread_thresh) +{ + unsigned long long exp_irq_ts; + int total; + int irq; + + /* + * IRQ latency or Thread latency? + */ + if (taa_data->tlat_irq_seqnum > taa_data->tlat_thread_seqnum) { + irq = 1; + total = taa_data->tlat_irq_latency; + } else { + irq = 0; + total = taa_data->tlat_thread_latency; + } + + /* + * Expected IRQ arrival time using the trace clock as the base. + */ + exp_irq_ts = taa_data->timer_irq_start_time - taa_data->timer_irq_start_delay; + + if (exp_irq_ts < taa_data->prev_irq_timstamp + taa_data->prev_irq_duration) + printf(" Previous IRQ interference: \t up to %9.2f us", + ns_to_usf(taa_data->prev_irq_duration)); + + /* + * The delay that the IRQ suffered before starting. + */ + printf(" IRQ handler delay: %16s %9.2f us (%.2f %%)\n", + (ns_to_usf(taa_data->timer_exit_from_idle) > 10) ? "(exit from idle)" : "", + ns_to_usf(taa_data->timer_irq_start_delay), + ns_to_per(total, taa_data->timer_irq_start_delay)); + + /* + * Timerlat IRQ. + */ + printf(" IRQ latency: \t\t\t\t %9.2f us\n", + ns_to_usf(taa_data->tlat_irq_latency)); + + if (irq) { + /* + * If the trace stopped due to IRQ, the other events will not happen + * because... the trace stopped :-). + * + * That is all folks, the stack trace was printed before the stop, + * so it will be displayed, it is the key. + */ + printf(" Blocking thread:\n"); + printf(" %24s:%-9llu\n", + taa_data->run_thread_comm, taa_data->run_thread_pid); + } else { + /* + * The duration of the IRQ handler that handled the timerlat IRQ. + */ + printf(" Timerlat IRQ duration: \t\t %9.2f us (%.2f %%)\n", + ns_to_usf(taa_data->timer_irq_duration), + ns_to_per(total, taa_data->timer_irq_duration)); + + /* + * The amount of time that the current thread postponed the scheduler. + * + * Recalling that it is net from NMI/IRQ/Softirq interference, so there + * is no need to compute values here. + */ + printf(" Blocking thread: \t\t\t %9.2f us (%.2f %%)\n", + ns_to_usf(taa_data->thread_blocking_duration), + ns_to_per(total, taa_data->thread_blocking_duration)); + + printf(" %24s:%-9llu %9.2f us\n", + taa_data->run_thread_comm, taa_data->run_thread_pid, + ns_to_usf(taa_data->thread_blocking_duration)); + } + + /* + * Print the stack trace! + */ + trace_seq_do_printf(taa_data->stack_seq); + + /* + * NMIs can happen during the IRQ, so they are always possible. + */ + if (taa_data->thread_nmi_sum) + printf(" NMI interference \t\t\t %9.2f us (%.2f %%)\n", + ns_to_usf(taa_data->thread_nmi_sum), + ns_to_per(total, taa_data->thread_nmi_sum)); + + /* + * If it is an IRQ latency, the other factors can be skipped. + */ + if (irq) + goto print_total; + + /* + * Prints the interference caused by IRQs to the thread latency. + */ + if (taa_data->thread_irq_sum) { + printf(" IRQ interference \t\t\t %9.2f us (%.2f %%)\n", + ns_to_usf(taa_data->thread_irq_sum), + ns_to_per(total, taa_data->thread_irq_sum)); + + trace_seq_do_printf(taa_data->irqs_seq); + } + + /* + * Prints the interference caused by Softirqs to the thread latency. + */ + if (taa_data->thread_softirq_sum) { + printf(" Softirq interference \t\t\t %9.2f us (%.2f %%)\n", + ns_to_usf(taa_data->thread_softirq_sum), + ns_to_per(total, taa_data->thread_softirq_sum)); + + trace_seq_do_printf(taa_data->softirqs_seq); + } + + /* + * Prints the interference caused by other threads to the thread latency. + * + * If this happens, your timerlat is not the highest prio. OK, migration + * thread can happen. But otherwise, you are not measuring the "scheduling + * latency" only, and here is the difference from scheduling latency and + * timer handling latency. + */ + if (taa_data->thread_thread_sum) { + printf(" Thread interference \t\t\t %9.2f us (%.2f %%)\n", + ns_to_usf(taa_data->thread_thread_sum), + ns_to_per(total, taa_data->thread_thread_sum)); + + trace_seq_do_printf(taa_data->threads_seq); + } + + /* + * Done. + */ +print_total: + printf("------------------------------------------------------------------------\n"); + printf(" %s latency: \t\t\t %9.2f us (100%%)\n", irq ? "IRQ" : "Thread", + ns_to_usf(total)); +} + +/** + * timerlat_auto_analysis - Analyze the collected data + */ +void timerlat_auto_analysis(int irq_thresh, int thread_thresh) +{ + struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx(); + unsigned long long max_exit_from_idle = 0; + struct timerlat_aa_data *taa_data; + int max_exit_from_idle_cpu; + struct tep_handle *tep; + int cpu; + + /* bring stop tracing to the ns scale */ + irq_thresh = irq_thresh * 1000; + thread_thresh = thread_thresh * 1000; + + for (cpu = 0; cpu < taa_ctx->nr_cpus; cpu++) { + taa_data = timerlat_aa_get_data(taa_ctx, cpu); + + if (irq_thresh && taa_data->tlat_irq_latency >= irq_thresh) { + printf("## CPU %d hit stop tracing, analyzing it ##\n", cpu); + timerlat_thread_analysis(taa_data, cpu, irq_thresh, thread_thresh); + } else if (thread_thresh && (taa_data->tlat_thread_latency) >= thread_thresh) { + printf("## CPU %d hit stop tracing, analyzing it ##\n", cpu); + timerlat_thread_analysis(taa_data, cpu, irq_thresh, thread_thresh); + } + + if (taa_data->max_exit_idle_latency > max_exit_from_idle) { + max_exit_from_idle = taa_data->max_exit_idle_latency; + max_exit_from_idle_cpu = cpu; + } + + } + + if (max_exit_from_idle) { + printf("\n"); + printf("Max timerlat IRQ latency from idle: %.2f us in cpu %d\n", + ns_to_usf(max_exit_from_idle), max_exit_from_idle_cpu); + } + if (!taa_ctx->dump_tasks) + return; + + printf("\n"); + printf("Printing CPU tasks:\n"); + for (cpu = 0; cpu < taa_ctx->nr_cpus; cpu++) { + taa_data = timerlat_aa_get_data(taa_ctx, cpu); + tep = taa_ctx->tool->trace.tep; + + printf(" [%.3d] %24s:%llu", cpu, taa_data->current_comm, taa_data->current_pid); + + if (taa_data->kworker_func) + printf(" kworker:%s:%s", + tep_find_function(tep, taa_data->kworker) ? : "<...>", + tep_find_function(tep, taa_data->kworker_func)); + printf("\n"); + } + +} + +/* + * timerlat_aa_destroy_seqs - Destroy seq files used to store parsed data + */ +static void timerlat_aa_destroy_seqs(struct timerlat_aa_context *taa_ctx) +{ + struct timerlat_aa_data *taa_data; + int i; + + if (!taa_ctx->taa_data) + return; + + for (i = 0; i < taa_ctx->nr_cpus; i++) { + taa_data = timerlat_aa_get_data(taa_ctx, i); + + if (taa_data->prev_irqs_seq) { + trace_seq_destroy(taa_data->prev_irqs_seq); + free(taa_data->prev_irqs_seq); + } + + if (taa_data->nmi_seq) { + trace_seq_destroy(taa_data->nmi_seq); + free(taa_data->nmi_seq); + } + + if (taa_data->irqs_seq) { + trace_seq_destroy(taa_data->irqs_seq); + free(taa_data->irqs_seq); + } + + if (taa_data->softirqs_seq) { + trace_seq_destroy(taa_data->softirqs_seq); + free(taa_data->softirqs_seq); + } + + if (taa_data->threads_seq) { + trace_seq_destroy(taa_data->threads_seq); + free(taa_data->threads_seq); + } + + if (taa_data->stack_seq) { + trace_seq_destroy(taa_data->stack_seq); + free(taa_data->stack_seq); + } + } +} + +/* + * timerlat_aa_init_seqs - Init seq files used to store parsed information + * + * Instead of keeping data structures to store raw data, use seq files to + * store parsed data. + * + * Allocates and initialize seq files. + * + * Returns 0 on success, -1 otherwise. + */ +static int timerlat_aa_init_seqs(struct timerlat_aa_context *taa_ctx) +{ + struct timerlat_aa_data *taa_data; + int i; + + for (i = 0; i < taa_ctx->nr_cpus; i++) { + + taa_data = timerlat_aa_get_data(taa_ctx, i); + + taa_data->prev_irqs_seq = calloc(1, sizeof(*taa_data->prev_irqs_seq)); + if (!taa_data->prev_irqs_seq) + goto out_err; + + trace_seq_init(taa_data->prev_irqs_seq); + + taa_data->nmi_seq = calloc(1, sizeof(*taa_data->nmi_seq)); + if (!taa_data->nmi_seq) + goto out_err; + + trace_seq_init(taa_data->nmi_seq); + + taa_data->irqs_seq = calloc(1, sizeof(*taa_data->irqs_seq)); + if (!taa_data->irqs_seq) + goto out_err; + + trace_seq_init(taa_data->irqs_seq); + + taa_data->softirqs_seq = calloc(1, sizeof(*taa_data->softirqs_seq)); + if (!taa_data->softirqs_seq) + goto out_err; + + trace_seq_init(taa_data->softirqs_seq); + + taa_data->threads_seq = calloc(1, sizeof(*taa_data->threads_seq)); + if (!taa_data->threads_seq) + goto out_err; + + trace_seq_init(taa_data->threads_seq); + + taa_data->stack_seq = calloc(1, sizeof(*taa_data->stack_seq)); + if (!taa_data->stack_seq) + goto out_err; + + trace_seq_init(taa_data->stack_seq); + } + + return 0; + +out_err: + timerlat_aa_destroy_seqs(taa_ctx); + return -1; +} + +/* + * timerlat_aa_unregister_events - Unregister events used in the auto-analysis + */ +static void timerlat_aa_unregister_events(struct osnoise_tool *tool, int dump_tasks) +{ + tracefs_event_disable(tool->trace.inst, "osnoise", NULL); + + tep_unregister_event_handler(tool->trace.tep, -1, "osnoise", "nmi_noise", + timerlat_aa_nmi_handler, tool); + + tep_unregister_event_handler(tool->trace.tep, -1, "osnoise", "irq_noise", + timerlat_aa_irq_handler, tool); + + tep_unregister_event_handler(tool->trace.tep, -1, "osnoise", "softirq_noise", + timerlat_aa_softirq_handler, tool); + + tep_unregister_event_handler(tool->trace.tep, -1, "osnoise", "thread_noise", + timerlat_aa_thread_handler, tool); + + tep_unregister_event_handler(tool->trace.tep, -1, "ftrace", "kernel_stack", + timerlat_aa_stack_handler, tool); + if (!dump_tasks) + return; + + tracefs_event_disable(tool->trace.inst, "sched", "sched_switch"); + tep_unregister_event_handler(tool->trace.tep, -1, "sched", "sched_switch", + timerlat_aa_sched_switch_handler, tool); + + tracefs_event_disable(tool->trace.inst, "workqueue", "workqueue_execute_start"); + tep_unregister_event_handler(tool->trace.tep, -1, "workqueue", "workqueue_execute_start", + timerlat_aa_kworker_start_handler, tool); +} + +/* + * timerlat_aa_register_events - Register events used in the auto-analysis + * + * Returns 0 on success, -1 otherwise. + */ +static int timerlat_aa_register_events(struct osnoise_tool *tool, int dump_tasks) +{ + int retval; + + /* + * register auto-analysis handlers. + */ + retval = tracefs_event_enable(tool->trace.inst, "osnoise", NULL); + if (retval < 0 && !errno) { + err_msg("Could not find osnoise events\n"); + goto out_err; + } + + tep_register_event_handler(tool->trace.tep, -1, "osnoise", "nmi_noise", + timerlat_aa_nmi_handler, tool); + + tep_register_event_handler(tool->trace.tep, -1, "osnoise", "irq_noise", + timerlat_aa_irq_handler, tool); + + tep_register_event_handler(tool->trace.tep, -1, "osnoise", "softirq_noise", + timerlat_aa_softirq_handler, tool); + + tep_register_event_handler(tool->trace.tep, -1, "osnoise", "thread_noise", + timerlat_aa_thread_handler, tool); + + tep_register_event_handler(tool->trace.tep, -1, "ftrace", "kernel_stack", + timerlat_aa_stack_handler, tool); + + if (!dump_tasks) + return 0; + + /* + * Dump task events. + */ + retval = tracefs_event_enable(tool->trace.inst, "sched", "sched_switch"); + if (retval < 0 && !errno) { + err_msg("Could not find sched_switch\n"); + goto out_err; + } + + tep_register_event_handler(tool->trace.tep, -1, "sched", "sched_switch", + timerlat_aa_sched_switch_handler, tool); + + retval = tracefs_event_enable(tool->trace.inst, "workqueue", "workqueue_execute_start"); + if (retval < 0 && !errno) { + err_msg("Could not find workqueue_execute_start\n"); + goto out_err; + } + + tep_register_event_handler(tool->trace.tep, -1, "workqueue", "workqueue_execute_start", + timerlat_aa_kworker_start_handler, tool); + + return 0; + +out_err: + timerlat_aa_unregister_events(tool, dump_tasks); + return -1; +} + +/** + * timerlat_aa_destroy - Destroy timerlat auto-analysis + */ +void timerlat_aa_destroy(void) +{ + struct timerlat_aa_context *taa_ctx = timerlat_aa_get_ctx(); + + if (!taa_ctx) + return; + + if (!taa_ctx->taa_data) + goto out_ctx; + + timerlat_aa_unregister_events(taa_ctx->tool, taa_ctx->dump_tasks); + timerlat_aa_destroy_seqs(taa_ctx); + free(taa_ctx->taa_data); +out_ctx: + free(taa_ctx); +} + +/** + * timerlat_aa_init - Initialize timerlat auto-analysis + * + * Returns 0 on success, -1 otherwise. + */ +int timerlat_aa_init(struct osnoise_tool *tool, int nr_cpus, int dump_tasks) +{ + struct timerlat_aa_context *taa_ctx; + int retval; + + taa_ctx = calloc(1, sizeof(*taa_ctx)); + if (!taa_ctx) + return -1; + + __timerlat_aa_ctx = taa_ctx; + + taa_ctx->nr_cpus = nr_cpus; + taa_ctx->tool = tool; + taa_ctx->dump_tasks = dump_tasks; + + taa_ctx->taa_data = calloc(nr_cpus, sizeof(*taa_ctx->taa_data)); + if (!taa_ctx->taa_data) + goto out_err; + + retval = timerlat_aa_init_seqs(taa_ctx); + if (retval) + goto out_err; + + retval = timerlat_aa_register_events(tool, dump_tasks); + if (retval) + goto out_err; + + return 0; + +out_err: + timerlat_aa_destroy(); + return -1; +} diff --git a/tools/tracing/rtla/src/timerlat_aa.h b/tools/tracing/rtla/src/timerlat_aa.h new file mode 100644 index 000000000000..d4f6ca7e342a --- /dev/null +++ b/tools/tracing/rtla/src/timerlat_aa.h @@ -0,0 +1,12 @@ +// 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); diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c index 334271935222..eea5b3357e27 100644 --- a/tools/tracing/rtla/src/timerlat_top.c +++ b/tools/tracing/rtla/src/timerlat_top.c @@ -10,10 +10,12 @@ #include <unistd.h> #include <stdio.h> #include <time.h> +#include <errno.h> #include "utils.h" #include "osnoise.h" #include "timerlat.h" +#include "timerlat_aa.h" struct timerlat_top_params { char *cpus; @@ -30,6 +32,8 @@ struct timerlat_top_params { int quiet; int set_sched; int dma_latency; + int no_aa; + int dump_tasks; struct sched_attr sched_param; struct trace_events *events; }; @@ -130,17 +134,22 @@ timerlat_top_handler(struct trace_seq *s, struct tep_record *record, struct tep_event *event, void *context) { struct trace_instance *trace = context; + struct timerlat_top_params *params; unsigned long long latency, thread; struct osnoise_tool *top; int cpu = record->cpu; top = container_of(trace, struct osnoise_tool, trace); + params = top->params; 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); + if (!params->no_aa) + timerlat_aa_handler(s, record, event, context); + return 0; } @@ -281,11 +290,13 @@ static void timerlat_top_usage(char *usage) " -c/--cpus cpus: run the tracer only on the given cpus", " -d/--duration time[m|h|d]: duration of the session in seconds", " -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", @@ -349,13 +360,15 @@ static struct timerlat_top_params {"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'}, {0, 0, 0, 0} }; /* getopt_long stores the option index here. */ int option_index = 0; - c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:2:", + c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:2:34", long_options, &option_index); /* detect the end of the options. */ @@ -368,13 +381,13 @@ static struct timerlat_top_params /* set thread stop to auto_thresh */ params->stop_total_us = auto_thresh; + params->stop_us = auto_thresh; /* get stack trace */ params->print_stack = auto_thresh; /* set trace */ params->trace_output = "timerlat_trace.txt"; - break; case 'c': retval = parse_cpu_list(optarg, ¶ms->monitored_cpus); @@ -437,6 +450,7 @@ static struct timerlat_top_params params->trace_output = &optarg[1]; else params->trace_output = "timerlat_trace.txt"; + break; case '0': /* trigger */ if (params->events) { @@ -467,6 +481,12 @@ static struct timerlat_top_params exit(EXIT_FAILURE); } break; + case '3': /* no-aa */ + params->no_aa = 1; + break; + case '4': + params->dump_tasks = 1; + break; default: timerlat_top_usage("Invalid option"); } @@ -477,6 +497,12 @@ static struct timerlat_top_params exit(EXIT_FAILURE); } + /* + * Auto analysis only happens if stop tracing, thus: + */ + if (!params->stop_us && !params->stop_total_us) + params->no_aa = 1; + return params; } @@ -547,6 +573,7 @@ static struct osnoise_tool { struct osnoise_tool *top; int nr_cpus; + int retval; nr_cpus = sysconf(_SC_NPROCESSORS_CONF); @@ -563,6 +590,16 @@ static struct osnoise_tool tep_register_event_handler(top->trace.tep, -1, "ftrace", "timerlat", timerlat_top_handler, top); + /* + * If no auto analysis, we are ready. + */ + if (params->no_aa) + return top; + + retval = timerlat_aa_init(top, nr_cpus, params->dump_tasks); + if (retval) + goto out_err; + return top; out_err: @@ -688,6 +725,10 @@ int timerlat_top_main(int argc, char *argv[]) if (trace_is_off(&top->trace, &record->trace)) { printf("rtla timerlat hit stop tracing\n"); + + if (!params->no_aa) + timerlat_auto_analysis(params->stop_us, params->stop_total_us); + if (params->trace_output) { printf(" Saving trace to %s\n", params->trace_output); save_trace_to_file(record->trace.inst, params->trace_output); @@ -701,6 +742,7 @@ out_top: params->events = NULL; out_free: timerlat_free_top(top->data); + timerlat_aa_destroy(); osnoise_destroy_tool(record); osnoise_destroy_tool(top); free(params); diff --git a/tools/tracing/rtla/src/utils.h b/tools/tracing/rtla/src/utils.h index 5571afd3b549..90e4f52a030b 100644 --- a/tools/tracing/rtla/src/utils.h +++ b/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) |