When copying timerlat auto-analysis from a terminal to some web pages or chats, the \t are being replaced with a single ' ' or ' ', breaking the output.

For example: ## CPU 3 hit stop tracing, analyzing it ## IRQ handler delay: 1.30 us (0.11 %) IRQ latency: 1.90 us Timerlat IRQ duration: 3.00 us (0.24 %) Blocking thread: 1223.16 us (99.00 %) insync:4048 1223.16 us IRQ interference 4.93 us (0.40 %) local_timer:236 4.93 us ------------------------------------------------------------------------ Thread latency: 1235.47 us (100%)

Replace \t with spaces to avoid this problem.

Cc: stable@vger.kernel.org Fixes: 27e348b221f6 ("rtla/timerlat: Add auto-analysis core") Signed-off-by: Daniel Bristot de Oliveira bristot@kernel.org --- tools/tracing/rtla/src/timerlat_aa.c | 109 ++++++++++++++++----------- 1 file changed, 63 insertions(+), 46 deletions(-)

diff --git a/tools/tracing/rtla/src/timerlat_aa.c b/tools/tracing/rtla/src/timerlat_aa.c index 7093fd5333be..7bd80ee2a5b4 100644 --- a/tools/tracing/rtla/src/timerlat_aa.c +++ b/tools/tracing/rtla/src/timerlat_aa.c @@ -16,6 +16,9 @@ enum timelat_state { TIMERLAT_WAITING_THREAD, };

+/* Used to fill spaces in the output */ +static const char *spaces = " "; + #define MAX_COMM 24

/* @@ -274,14 +277,17 @@ static int timerlat_aa_nmi_handler(struct trace_seq *s, struct tep_record *recor 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)); + trace_seq_printf(taa_data->prev_irqs_seq, " %24s %.*s %9.2f us\n", + "nmi", + 24, spaces, + 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)); + trace_seq_printf(taa_data->nmi_seq, " %24s %.*s %9.2f us\n", + "nmi", + 24, spaces, ns_to_usf(duration));

return 0; } @@ -323,8 +329,10 @@ static int timerlat_aa_irq_handler(struct trace_seq *s, struct tep_record *recor 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)); + trace_seq_printf(taa_data->prev_irqs_seq, " %24s:%-3llu %.*s %9.2f us\n", + desc, vector, + 15, spaces, + ns_to_usf(duration)); return 0; }

@@ -372,8 +380,10 @@ static int timerlat_aa_irq_handler(struct trace_seq *s, struct tep_record *recor * 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)); + trace_seq_printf(taa_data->irqs_seq, " %24s:%-3llu %.*s %9.2f us\n", + desc, vector, + 24, spaces, + ns_to_usf(duration));

return 0; } @@ -408,8 +418,10 @@ static int timerlat_aa_softirq_handler(struct trace_seq *s, struct tep_record *r

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)); + trace_seq_printf(taa_data->softirqs_seq, " %24s:%-3llu %.*s %9.2f us\n", + softirq_name[vector], vector, + 24, spaces, + ns_to_usf(duration)); return 0; }

@@ -452,8 +464,10 @@ static int timerlat_aa_thread_handler(struct trace_seq *s, struct tep_record *re } 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)); + trace_seq_printf(taa_data->threads_seq, " %24s:%-12llu %.*s %9.2f us\n", + comm, pid, + 15, spaces, + ns_to_usf(duration)); }

return 0; @@ -482,7 +496,8 @@ static int timerlat_aa_stack_handler(struct trace_seq *s, struct tep_record *rec 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); + trace_seq_printf(taa_data->stack_seq, " %.*s -> %s\n", + 14, spaces, function); } } return 0; @@ -568,23 +583,24 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, 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) { if (taa_data->prev_irq_timstamp < taa_data->timer_irq_start_time) - printf(" Previous IRQ interference: \t\t up to %9.2f us\n", - ns_to_usf(taa_data->prev_irq_duration)); + printf(" Previous IRQ interference: %.*s up to %9.2f us\n", + 16, spaces, + 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)); + printf(" IRQ handler delay: %.*s %16s %9.2f us (%.2f %%)\n", 16, spaces, + (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)); + printf(" IRQ latency: %.*s %9.2f us\n", 40, spaces, + ns_to_usf(taa_data->tlat_irq_latency));

if (irq) { /* @@ -595,15 +611,16 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, * 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); + printf(" %.*s %24s:%-9llu\n", 6, spaces, 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)); + printf(" Timerlat IRQ duration: %.*s %9.2f us (%.2f %%)\n", + 30, spaces, + 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. @@ -611,13 +628,13 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, * 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(" Blocking thread: %.*s %9.2f us (%.2f %%)\n", 36, spaces, + 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)); + printf(" %.*s %24s:%-9llu %.*s %9.2f us\n", 6, spaces, + taa_data->run_thread_comm, taa_data->run_thread_pid, + 12, spaces, ns_to_usf(taa_data->thread_blocking_duration)); }

/* @@ -629,9 +646,9 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, * 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)); + printf(" NMI interference %.*s %9.2f us (%.2f %%)\n", 36, spaces, + 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. @@ -643,9 +660,9 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, * 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)); + printf(" IRQ interference %.*s %9.2f us (%.2f %%)\n", 36, spaces, + 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); } @@ -654,9 +671,9 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, * 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)); + printf(" Softirq interference %.*s %9.2f us (%.2f %%)\n", 32, spaces, + 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); } @@ -670,9 +687,9 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, * 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)); + printf(" Thread interference %.*s %9.2f us (%.2f %%)\n", 33, spaces, + 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); } @@ -682,8 +699,8 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu, */ print_total: printf("------------------------------------------------------------------------\n"); - printf(" %s latency: \t\t\t %9.2f us (100%%)\n", irq ? "IRQ" : "Thread", - ns_to_usf(total)); + printf(" %s latency: %.*s %9.2f us (100%%)\n", irq ? " IRQ" : "Thread", + 37, spaces, ns_to_usf(total)); }

static int timerlat_auto_analysis_collect_trace(struct timerlat_aa_context *taa_ctx)