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Message-ID: <20241227123209.00f7f27b@gandalf.local.home>
Date: Fri, 27 Dec 2024 12:32:09 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Tomas Glozar <tglozar@...hat.com>
Subject: [for-linus][PATCH] rtla/timerlat: Fix histogram ALL for zero
samples
tooling fixes for v6.13:
- Fix rtla divide by zero when the count is zero in histograms
git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
tools/fixes
Head SHA1: 6cc45f8c1f898570916044f606be9890d295e129
Tomas Glozar (1):
rtla/timerlat: Fix histogram ALL for zero samples
----
tools/tracing/rtla/src/timerlat_hist.c | 177 ++++++++++++++++++---------------
1 file changed, 96 insertions(+), 81 deletions(-)
---------------------------
commit 6cc45f8c1f898570916044f606be9890d295e129
Author: Tomas Glozar <tglozar@...hat.com>
Date: Wed Nov 27 14:41:30 2024 +0100
rtla/timerlat: Fix histogram ALL for zero samples
rtla timerlat hist currently computers the minimum, maximum and average
latency even in cases when there are zero samples. This leads to
nonsensical values being calculated for maximum and minimum, and to
divide by zero for average.
A similar bug is fixed by 01b05fc0e5f3 ("rtla/timerlat: Fix histogram
report when a cpu count is 0") but the bug still remains for printing
the sum over all CPUs in timerlat_print_stats_all.
The issue can be reproduced with this command:
$ rtla timerlat hist -U -d 1s
Index
over:
count:
min:
avg:
max:
Floating point exception (core dumped)
(There are always no samples with -U unless the user workload is
created.)
Fix the bug by omitting max/min/avg when sample count is zero,
displaying a dash instead, just like we already do for the individual
CPUs. The logic is moved into a new function called
format_summary_value, which is used for both the individual CPUs
and for the overall summary.
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/20241127134130.51171-1-tglozar@redhat.com
Fixes: 1462501c7a8 ("rtla/timerlat: Add a summary for hist mode")
Signed-off-by: Tomas Glozar <tglozar@...hat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index 8b66387e5f35..4403cc4eba30 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -281,6 +281,21 @@ static void timerlat_hist_header(struct osnoise_tool *tool)
trace_seq_reset(s);
}
+/*
+ * format_summary_value - format a line of summary value (min, max or avg)
+ * of hist data
+ */
+static void format_summary_value(struct trace_seq *seq,
+ int count,
+ unsigned long long val,
+ bool avg)
+{
+ if (count)
+ trace_seq_printf(seq, "%9llu ", avg ? val / count : val);
+ else
+ trace_seq_printf(seq, "%9c ", '-');
+}
+
/*
* timerlat_print_summary - print the summary of the hist data to the output
*/
@@ -328,29 +343,23 @@ timerlat_print_summary(struct timerlat_hist_params *params,
if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
continue;
- if (!params->no_irq) {
- if (data->hist[cpu].irq_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].min_irq);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (!params->no_irq)
+ format_summary_value(trace->seq,
+ data->hist[cpu].irq_count,
+ data->hist[cpu].min_irq,
+ false);
- if (!params->no_thread) {
- if (data->hist[cpu].thread_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].min_thread);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (!params->no_thread)
+ format_summary_value(trace->seq,
+ data->hist[cpu].thread_count,
+ data->hist[cpu].min_thread,
+ false);
- if (params->user_hist) {
- if (data->hist[cpu].user_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].min_user);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (params->user_hist)
+ format_summary_value(trace->seq,
+ data->hist[cpu].user_count,
+ data->hist[cpu].min_user,
+ false);
}
trace_seq_printf(trace->seq, "\n");
@@ -364,29 +373,23 @@ timerlat_print_summary(struct timerlat_hist_params *params,
if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
continue;
- if (!params->no_irq) {
- if (data->hist[cpu].irq_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].sum_irq / data->hist[cpu].irq_count);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (!params->no_irq)
+ format_summary_value(trace->seq,
+ data->hist[cpu].irq_count,
+ data->hist[cpu].sum_irq,
+ true);
- if (!params->no_thread) {
- if (data->hist[cpu].thread_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].sum_thread / data->hist[cpu].thread_count);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (!params->no_thread)
+ format_summary_value(trace->seq,
+ data->hist[cpu].thread_count,
+ data->hist[cpu].sum_thread,
+ true);
- if (params->user_hist) {
- if (data->hist[cpu].user_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].sum_user / data->hist[cpu].user_count);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (params->user_hist)
+ format_summary_value(trace->seq,
+ data->hist[cpu].user_count,
+ data->hist[cpu].sum_user,
+ true);
}
trace_seq_printf(trace->seq, "\n");
@@ -400,29 +403,23 @@ timerlat_print_summary(struct timerlat_hist_params *params,
if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
continue;
- if (!params->no_irq) {
- if (data->hist[cpu].irq_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].max_irq);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (!params->no_irq)
+ format_summary_value(trace->seq,
+ data->hist[cpu].irq_count,
+ data->hist[cpu].max_irq,
+ false);
- if (!params->no_thread) {
- if (data->hist[cpu].thread_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].max_thread);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (!params->no_thread)
+ format_summary_value(trace->seq,
+ data->hist[cpu].thread_count,
+ data->hist[cpu].max_thread,
+ false);
- if (params->user_hist) {
- if (data->hist[cpu].user_count)
- trace_seq_printf(trace->seq, "%9llu ",
- data->hist[cpu].max_user);
- else
- trace_seq_printf(trace->seq, " - ");
- }
+ if (params->user_hist)
+ format_summary_value(trace->seq,
+ data->hist[cpu].user_count,
+ data->hist[cpu].max_user,
+ false);
}
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);
@@ -506,16 +503,22 @@ timerlat_print_stats_all(struct timerlat_hist_params *params,
trace_seq_printf(trace->seq, "min: ");
if (!params->no_irq)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.min_irq);
+ format_summary_value(trace->seq,
+ sum.irq_count,
+ sum.min_irq,
+ false);
if (!params->no_thread)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.min_thread);
+ format_summary_value(trace->seq,
+ sum.thread_count,
+ sum.min_thread,
+ false);
if (params->user_hist)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.min_user);
+ format_summary_value(trace->seq,
+ sum.user_count,
+ sum.min_user,
+ false);
trace_seq_printf(trace->seq, "\n");
@@ -523,16 +526,22 @@ timerlat_print_stats_all(struct timerlat_hist_params *params,
trace_seq_printf(trace->seq, "avg: ");
if (!params->no_irq)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.sum_irq / sum.irq_count);
+ format_summary_value(trace->seq,
+ sum.irq_count,
+ sum.sum_irq,
+ true);
if (!params->no_thread)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.sum_thread / sum.thread_count);
+ format_summary_value(trace->seq,
+ sum.thread_count,
+ sum.sum_thread,
+ true);
if (params->user_hist)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.sum_user / sum.user_count);
+ format_summary_value(trace->seq,
+ sum.user_count,
+ sum.sum_user,
+ true);
trace_seq_printf(trace->seq, "\n");
@@ -540,16 +549,22 @@ timerlat_print_stats_all(struct timerlat_hist_params *params,
trace_seq_printf(trace->seq, "max: ");
if (!params->no_irq)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.max_irq);
+ format_summary_value(trace->seq,
+ sum.irq_count,
+ sum.max_irq,
+ false);
if (!params->no_thread)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.max_thread);
+ format_summary_value(trace->seq,
+ sum.thread_count,
+ sum.max_thread,
+ false);
if (params->user_hist)
- trace_seq_printf(trace->seq, "%9llu ",
- sum.max_user);
+ format_summary_value(trace->seq,
+ sum.user_count,
+ sum.max_user,
+ false);
trace_seq_printf(trace->seq, "\n");
trace_seq_do_printf(trace->seq);
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