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rtla: Add hwnoise tool
The hwnoise tool is a special mode for the osnoise top tool.
hwnoise dispatches the osnoise tracer and displays a summary of the noise.
The difference is that it runs the tracer with the OSNOISE_IRQ_DISABLE
option set, thus only allowing only hardware-related noise, resulting in
a simplified output. hwnoise has the same features of osnoise.
An example of the tool's output:
# rtla hwnoise -c 1-11 -T 1 -d 10m -q
Hardware-related Noise
duration: 0 00:10:00 | time is in us
CPU Period Runtime Noise % CPU Aval Max Noise Max Single HW NMI
1 #599 599000000 138 99.99997 3 3 4 74
2 #599 599000000 85 99.99998 3 3 4 75
3 #599 599000000 86 99.99998 4 3 6 75
4 #599 599000000 81 99.99998 4 4 2 75
5 #599 599000000 85 99.99998 2 2 2 75
Link: https://lkml.kernel.org/r/2d6f49a6f3a4f8b51b2c806458b1cff71ad4d014.1675805361.git.bristot@kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira
Steven Rostedt (Google)
parent
ce6cc6f70c
commit
1f428356c3
@ -119,6 +119,8 @@ install: doc_install
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$(STRIP) $(DESTDIR)$(BINDIR)/rtla
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@test ! -f $(DESTDIR)$(BINDIR)/osnoise || rm $(DESTDIR)$(BINDIR)/osnoise
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ln -s rtla $(DESTDIR)$(BINDIR)/osnoise
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@test ! -f $(DESTDIR)$(BINDIR)/hwnoise || rm $(DESTDIR)$(BINDIR)/hwnoise
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ln -s rtla $(DESTDIR)$(BINDIR)/hwnoise
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@test ! -f $(DESTDIR)$(BINDIR)/timerlat || rm $(DESTDIR)$(BINDIR)/timerlat
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ln -s rtla $(DESTDIR)$(BINDIR)/timerlat
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@ -734,6 +734,113 @@ void osnoise_put_tracing_thresh(struct osnoise_context *context)
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context->orig_tracing_thresh = OSNOISE_OPTION_INIT_VAL;
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}
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static int osnoise_options_get_option(char *option)
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{
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char *options = tracefs_instance_file_read(NULL, "osnoise/options", NULL);
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char no_option[128];
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int retval = 0;
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char *opt;
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if (!options)
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return OSNOISE_OPTION_INIT_VAL;
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/*
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* Check first if the option is disabled.
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*/
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snprintf(no_option, sizeof(no_option), "NO_%s", option);
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opt = strstr(options, no_option);
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if (opt)
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goto out_free;
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/*
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* Now that it is not disabled, if the string is there, it is
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* enabled. If the string is not there, the option does not exist.
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*/
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opt = strstr(options, option);
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if (opt)
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retval = 1;
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else
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retval = OSNOISE_OPTION_INIT_VAL;
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out_free:
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free(options);
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return retval;
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}
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static int osnoise_options_set_option(char *option, bool onoff)
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{
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char no_option[128];
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if (onoff)
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return tracefs_instance_file_write(NULL, "osnoise/options", option);
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snprintf(no_option, sizeof(no_option), "NO_%s", option);
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return tracefs_instance_file_write(NULL, "osnoise/options", no_option);
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}
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static int osnoise_get_irq_disable(struct osnoise_context *context)
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{
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if (context->opt_irq_disable != OSNOISE_OPTION_INIT_VAL)
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return context->opt_irq_disable;
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if (context->orig_opt_irq_disable != OSNOISE_OPTION_INIT_VAL)
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return context->orig_opt_irq_disable;
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context->orig_opt_irq_disable = osnoise_options_get_option("OSNOISE_IRQ_DISABLE");
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return context->orig_opt_irq_disable;
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}
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int osnoise_set_irq_disable(struct osnoise_context *context, bool onoff)
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{
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int opt_irq_disable = osnoise_get_irq_disable(context);
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int retval;
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if (opt_irq_disable == OSNOISE_OPTION_INIT_VAL)
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return -1;
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if (opt_irq_disable == onoff)
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return 0;
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retval = osnoise_options_set_option("OSNOISE_IRQ_DISABLE", onoff);
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if (retval < 0)
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return -1;
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context->opt_irq_disable = onoff;
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return 0;
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}
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static void osnoise_restore_irq_disable(struct osnoise_context *context)
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{
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int retval;
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if (context->orig_opt_irq_disable == OSNOISE_OPTION_INIT_VAL)
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return;
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if (context->orig_opt_irq_disable == context->opt_irq_disable)
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goto out_done;
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retval = osnoise_options_set_option("OSNOISE_IRQ_DISABLE", context->orig_opt_irq_disable);
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if (retval < 0)
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err_msg("Could not restore original OSNOISE_IRQ_DISABLE option\n");
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out_done:
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context->orig_opt_irq_disable = OSNOISE_OPTION_INIT_VAL;
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}
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static void osnoise_put_irq_disable(struct osnoise_context *context)
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{
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osnoise_restore_irq_disable(context);
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if (context->orig_opt_irq_disable == OSNOISE_OPTION_INIT_VAL)
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return;
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context->orig_opt_irq_disable = OSNOISE_OPTION_INIT_VAL;
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}
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/*
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* enable_osnoise - enable osnoise tracer in the trace_instance
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*/
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@ -798,6 +905,9 @@ struct osnoise_context *osnoise_context_alloc(void)
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context->orig_tracing_thresh = OSNOISE_OPTION_INIT_VAL;
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context->tracing_thresh = OSNOISE_OPTION_INIT_VAL;
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context->orig_opt_irq_disable = OSNOISE_OPTION_INIT_VAL;
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context->opt_irq_disable = OSNOISE_OPTION_INIT_VAL;
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osnoise_get_context(context);
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return context;
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@ -824,6 +934,7 @@ void osnoise_put_context(struct osnoise_context *context)
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osnoise_put_timerlat_period_us(context);
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osnoise_put_print_stack(context);
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osnoise_put_tracing_thresh(context);
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osnoise_put_irq_disable(context);
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free(context);
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}
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@ -958,3 +1069,9 @@ usage:
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osnoise_usage(1);
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exit(1);
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}
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int hwnoise_main(int argc, char *argv[])
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{
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osnoise_top_main(argc, argv);
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exit(0);
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}
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@ -38,6 +38,10 @@ struct osnoise_context {
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/* -1 as init value because 0 is disabled */
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long long orig_print_stack;
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long long print_stack;
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/* -1 as init value because 0 is off */
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int orig_opt_irq_disable;
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int opt_irq_disable;
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};
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/*
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@ -79,6 +83,8 @@ void osnoise_restore_print_stack(struct osnoise_context *context);
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int osnoise_set_print_stack(struct osnoise_context *context,
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long long print_stack);
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int osnoise_set_irq_disable(struct osnoise_context *context, bool onoff);
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/*
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* osnoise_tool - osnoise based tool definition.
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*/
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@ -97,3 +103,4 @@ struct osnoise_tool *osnoise_init_trace_tool(char *tracer);
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int osnoise_hist_main(int argc, char *argv[]);
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int osnoise_top_main(int argc, char **argv);
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int osnoise_main(int argc, char **argv);
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int hwnoise_main(int argc, char **argv);
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@ -14,6 +14,11 @@
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#include "osnoise.h"
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#include "utils.h"
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enum osnoise_mode {
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MODE_OSNOISE = 0,
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MODE_HWNOISE
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};
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/*
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* osnoise top parameters
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*/
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@ -32,6 +37,7 @@ struct osnoise_top_params {
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int set_sched;
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struct sched_attr sched_param;
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struct trace_events *events;
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enum osnoise_mode mode;
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};
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struct osnoise_top_cpu {
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@ -143,15 +149,23 @@ osnoise_top_handler(struct trace_seq *s, struct tep_record *record,
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*/
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static void osnoise_top_header(struct osnoise_tool *top)
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{
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struct osnoise_top_params *params = top->params;
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struct trace_seq *s = top->trace.seq;
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char duration[26];
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get_duration(top->start_time, duration, sizeof(duration));
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trace_seq_printf(s, "\033[2;37;40m");
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trace_seq_printf(s, " Operating System Noise");
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trace_seq_printf(s, " ");
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trace_seq_printf(s, " ");
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trace_seq_printf(s, " ");
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if (params->mode == MODE_OSNOISE) {
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trace_seq_printf(s, "Operating System Noise");
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trace_seq_printf(s, " ");
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} else if (params->mode == MODE_HWNOISE) {
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trace_seq_printf(s, "Hardware-related Noise");
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}
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trace_seq_printf(s, " ");
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trace_seq_printf(s, "\033[0;0;0m");
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trace_seq_printf(s, "\n");
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@ -162,7 +176,14 @@ static void osnoise_top_header(struct osnoise_tool *top)
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trace_seq_printf(s, " Noise ");
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trace_seq_printf(s, " %% CPU Aval ");
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trace_seq_printf(s, " Max Noise Max Single ");
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trace_seq_printf(s, " HW NMI IRQ Softirq Thread");
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trace_seq_printf(s, " HW NMI");
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if (params->mode == MODE_HWNOISE)
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goto eol;
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trace_seq_printf(s, " IRQ Softirq Thread");
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eol:
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trace_seq_printf(s, "\033[0;0;0m");
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trace_seq_printf(s, "\n");
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}
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@ -181,6 +202,7 @@ static void clear_terminal(struct trace_seq *seq)
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*/
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static void osnoise_top_print(struct osnoise_tool *tool, int cpu)
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{
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struct osnoise_top_params *params = tool->params;
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struct trace_seq *s = tool->trace.seq;
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struct osnoise_top_cpu *cpu_data;
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struct osnoise_top_data *data;
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@ -205,6 +227,12 @@ static void osnoise_top_print(struct osnoise_tool *tool, int cpu)
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trace_seq_printf(s, "%12llu ", cpu_data->hw_count);
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trace_seq_printf(s, "%12llu ", cpu_data->nmi_count);
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if (params->mode == MODE_HWNOISE) {
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trace_seq_printf(s, "\n");
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return;
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}
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trace_seq_printf(s, "%12llu ", cpu_data->irq_count);
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trace_seq_printf(s, "%12llu ", cpu_data->softirq_count);
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trace_seq_printf(s, "%12llu\n", cpu_data->thread_count);
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@ -241,12 +269,12 @@ osnoise_print_stats(struct osnoise_top_params *params, struct osnoise_tool *top)
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/*
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* osnoise_top_usage - prints osnoise top usage message
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*/
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void osnoise_top_usage(char *usage)
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static void osnoise_top_usage(struct osnoise_top_params *params, char *usage)
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{
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int i;
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static const char * const msg[] = {
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" usage: rtla osnoise [top] [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
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" [-h] [-q] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
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" [-T us] [-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
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" [-c cpu-list] [-P priority]",
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"",
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@ -277,9 +305,22 @@ void osnoise_top_usage(char *usage)
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if (usage)
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fprintf(stderr, "%s\n", usage);
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fprintf(stderr, "rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
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if (params->mode == MODE_OSNOISE) {
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fprintf(stderr,
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"rtla osnoise top: a per-cpu summary of the OS noise (version %s)\n",
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VERSION);
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fprintf(stderr, " usage: rtla osnoise [top]");
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}
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if (params->mode == MODE_HWNOISE) {
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fprintf(stderr,
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"rtla hwnoise: a summary of hardware-related noise (version %s)\n",
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VERSION);
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fprintf(stderr, " usage: rtla hwnoise");
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}
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for (i = 0; msg[i]; i++)
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fprintf(stderr, "%s\n", msg[i]);
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exit(1);
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@ -299,6 +340,9 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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if (!params)
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exit(1);
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if (strcmp(argv[0], "hwnoise") == 0)
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params->mode = MODE_HWNOISE;
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while (1) {
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static struct option long_options[] = {
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{"auto", required_argument, 0, 'a'},
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@ -345,7 +389,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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case 'c':
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retval = parse_cpu_list(optarg, ¶ms->monitored_cpus);
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if (retval)
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osnoise_top_usage("\nInvalid -c cpu list\n");
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osnoise_top_usage(params, "\nInvalid -c cpu list\n");
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params->cpus = optarg;
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break;
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case 'D':
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@ -354,7 +398,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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case 'd':
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params->duration = parse_seconds_duration(optarg);
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if (!params->duration)
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osnoise_top_usage("Invalid -D duration\n");
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osnoise_top_usage(params, "Invalid -D duration\n");
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break;
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case 'e':
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tevent = trace_event_alloc(optarg);
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@ -370,17 +414,17 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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break;
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case 'h':
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case '?':
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osnoise_top_usage(NULL);
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osnoise_top_usage(params, NULL);
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break;
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case 'p':
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params->period = get_llong_from_str(optarg);
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if (params->period > 10000000)
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osnoise_top_usage("Period longer than 10 s\n");
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osnoise_top_usage(params, "Period longer than 10 s\n");
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break;
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case 'P':
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retval = parse_prio(optarg, ¶ms->sched_param);
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if (retval == -1)
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osnoise_top_usage("Invalid -P priority");
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osnoise_top_usage(params, "Invalid -P priority");
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params->set_sched = 1;
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break;
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case 'q':
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@ -389,7 +433,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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case 'r':
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params->runtime = get_llong_from_str(optarg);
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if (params->runtime < 100)
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osnoise_top_usage("Runtime shorter than 100 us\n");
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osnoise_top_usage(params, "Runtime shorter than 100 us\n");
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break;
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case 's':
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params->stop_us = get_llong_from_str(optarg);
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@ -415,7 +459,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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exit(EXIT_FAILURE);
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}
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} else {
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osnoise_top_usage("--trigger requires a previous -e\n");
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osnoise_top_usage(params, "--trigger requires a previous -e\n");
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}
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break;
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case '1': /* filter */
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@ -426,11 +470,11 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
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exit(EXIT_FAILURE);
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}
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} else {
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osnoise_top_usage("--filter requires a previous -e\n");
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osnoise_top_usage(params, "--filter requires a previous -e\n");
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}
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break;
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default:
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osnoise_top_usage("Invalid option");
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osnoise_top_usage(params, "Invalid option");
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}
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}
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@ -495,6 +539,14 @@ osnoise_top_apply_config(struct osnoise_tool *tool, struct osnoise_top_params *p
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}
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}
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if (params->mode == MODE_HWNOISE) {
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retval = osnoise_set_irq_disable(tool->context, 1);
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if (retval) {
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err_msg("Failed to set OSNOISE_IRQ_DISABLE option\n");
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goto out_err;
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}
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}
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return 0;
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out_err:
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@ -26,6 +26,7 @@ static void rtla_usage(int err)
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"",
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" commands:",
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" osnoise - gives information about the operating system noise (osnoise)",
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" hwnoise - gives information about hardware-related noise",
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" timerlat - measures the timer irq and thread latency",
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"",
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NULL,
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@ -47,6 +48,9 @@ int run_command(int argc, char **argv, int start_position)
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if (strcmp(argv[start_position], "osnoise") == 0) {
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osnoise_main(argc-start_position, &argv[start_position]);
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goto ran;
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} else if (strcmp(argv[start_position], "hwnoise") == 0) {
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hwnoise_main(argc-start_position, &argv[start_position]);
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goto ran;
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} else if (strcmp(argv[start_position], "timerlat") == 0) {
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timerlat_main(argc-start_position, &argv[start_position]);
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goto ran;
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