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Message-ID: <a093065d78b7a4377c084fb4dc56942aedc5f6f2.1757034919.git.ipravdin.official@gmail.com>
Date: Sun, 7 Sep 2025 22:05:58 -0400
From: Ivan Pravdin <ipravdin.official@...il.com>
To: rostedt@...dmis.org,
tglozar@...hat.com,
linux-trace-kernel@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Ivan Pravdin <ipravdin.official@...il.com>
Subject: [PATCH v3 2/3] rtla: fix -C/--cgroup interface
Currently, user can only specify cgroup to the tracer's thread the
following ways:
`-C[cgroup]`
`-C[=cgroup]`
`--cgroup[=cgroup]`
If user tries to specify cgroup as `-C [cgroup]` or `--cgroup [cgroup]`,
the parser silently fails and rtla's cgroup is used for the tracer
threads.
To make interface more user-friendly, allow user to specify cgroup in
the aforementioned way, i.e. `-C [cgroup]` and `--cgroup [cgroup]`.
Refactor identical logic between -t/--trace and -C/--cgroup into a
common function.
Change documentation to reflect this user interface change.
Fixes: a957cbc02531 ("rtla: Add -C cgroup support")
Signed-off-by: Ivan Pravdin <ipravdin.official@...il.com>
---
Documentation/tools/rtla/common_options.rst | 2 +-
tools/tracing/rtla/src/osnoise_hist.c | 26 ++++++---------------
tools/tracing/rtla/src/osnoise_top.c | 26 ++++++---------------
tools/tracing/rtla/src/timerlat_hist.c | 26 ++++++---------------
tools/tracing/rtla/src/timerlat_top.c | 26 ++++++---------------
tools/tracing/rtla/src/utils.c | 26 +++++++++++++++++++++
tools/tracing/rtla/src/utils.h | 1 +
7 files changed, 56 insertions(+), 77 deletions(-)
diff --git a/Documentation/tools/rtla/common_options.rst b/Documentation/tools/rtla/common_options.rst
index 2dc1575210aa..3f292a12b7af 100644
--- a/Documentation/tools/rtla/common_options.rst
+++ b/Documentation/tools/rtla/common_options.rst
@@ -42,7 +42,7 @@
- *f:prio* - use SCHED_FIFO with *prio*;
- *d:runtime[us|ms|s]:period[us|ms|s]* - use SCHED_DEADLINE with *runtime* and *period* in nanoseconds.
-**-C**, **--cgroup**\[*=cgroup*]
+**-C**, **--cgroup** \[*cgroup*]
Set a *cgroup* to the tracer's threads. If the **-C** option is passed without arguments, the tracer's thread will inherit **rtla**'s *cgroup*. Otherwise, the threads will be placed on the *cgroup* passed to the option.
diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
index 8d579bcee709..1dc39de79d78 100644
--- a/tools/tracing/rtla/src/osnoise_hist.c
+++ b/tools/tracing/rtla/src/osnoise_hist.c
@@ -422,9 +422,9 @@ static void osnoise_hist_usage(char *usage)
static const char * const msg[] = {
"",
" usage: rtla osnoise hist [-h] [-D] [-d s] [-a us] [-p us] [-r us] [-s us] [-S us] \\",
- " [-T us] [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
+ " [-T us] [-t [file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
" [-c cpu-list] [-H cpu-list] [-P priority] [-b N] [-E N] [--no-header] [--no-summary] \\",
- " [--no-index] [--with-zeros] [-C[=cgroup_name]] [--warm-up]",
+ " [--no-index] [--with-zeros] [-C [cgroup_name]] [--warm-up]",
"",
" -h/--help: print this menu",
" -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
@@ -435,10 +435,10 @@ static void osnoise_hist_usage(char *usage)
" -T/--threshold us: the minimum delta to be considered a noise",
" -c/--cpus cpu-list: list of cpus to run osnoise threads",
" -H/--house-keeping cpus: run rtla control threads only on the given cpus",
- " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
+ " -C/--cgroup [cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
" -d/--duration time[s|m|h|d]: duration of the session",
" -D/--debug: print debug info",
- " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]",
+ " -t/--trace [file]: save the stopped trace to [file|osnoise_trace.txt]",
" -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
" --filter <filter>: enable a trace event filter to the previous -e event",
" --trigger <trigger>: enable a trace event trigger to the previous -e event",
@@ -559,13 +559,7 @@ static struct osnoise_params
break;
case 'C':
params->cgroup = 1;
- if (!optarg) {
- /* will inherit this cgroup */
- params->cgroup_name = NULL;
- } else if (*optarg == '=') {
- /* skip the = */
- params->cgroup_name = ++optarg;
- }
+ params->cgroup_name = parse_optional_arg(argc, argv);
break;
case 'D':
config_debug = 1;
@@ -630,14 +624,8 @@ static struct osnoise_params
params->threshold = get_llong_from_str(optarg);
break;
case 't':
- if (optarg) {
- if (optarg[0] == '=')
- params->trace_output = &optarg[1];
- else
- params->trace_output = &optarg[0];
- } else if (optind < argc && argv[optind][0] != '0')
- params->trace_output = argv[optind];
- else
+ params->trace_output = parse_optional_arg(argc, argv);
+ if (!params->trace_output)
params->trace_output = "osnoise_trace.txt";
break;
case '0': /* no header */
diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 2c12780c8aa9..b3e161536ed8 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -257,8 +257,8 @@ static void osnoise_top_usage(struct osnoise_params *params, char *usage)
static const char * const msg[] = {
" [-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] [-H cpu-list] [-P priority] [-C[=cgroup_name]] [--warm-up s]",
+ " [-T us] [-t [file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] \\",
+ " [-c cpu-list] [-H cpu-list] [-P priority] [-C [cgroup_name]] [--warm-up s]",
"",
" -h/--help: print this menu",
" -a/--auto: set automatic trace mode, stopping the session if argument in us sample is hit",
@@ -269,10 +269,10 @@ static void osnoise_top_usage(struct osnoise_params *params, char *usage)
" -T/--threshold us: the minimum delta to be considered a noise",
" -c/--cpus cpu-list: list of cpus to run osnoise threads",
" -H/--house-keeping cpus: run rtla control threads only on the given cpus",
- " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
+ " -C/--cgroup [cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
" -d/--duration time[s|m|h|d]: duration of the session",
" -D/--debug: print debug info",
- " -t/--trace[file]: save the stopped trace to [file|osnoise_trace.txt]",
+ " -t/--trace [file]: save the stopped trace to [file|osnoise_trace.txt]",
" -e/--event <sys:event>: enable the <sys:event> in the trace instance, multiple -e are allowed",
" --filter <filter>: enable a trace event filter to the previous -e event",
" --trigger <trigger>: enable a trace event trigger to the previous -e event",
@@ -394,13 +394,7 @@ struct osnoise_params *osnoise_top_parse_args(int argc, char **argv)
break;
case 'C':
params->cgroup = 1;
- if (!optarg) {
- /* will inherit this cgroup */
- params->cgroup_name = NULL;
- } else if (*optarg == '=') {
- /* skip the = */
- params->cgroup_name = ++optarg;
- }
+ params->cgroup_name = parse_optional_arg(argc, argv);
break;
case 'D':
config_debug = 1;
@@ -460,14 +454,8 @@ struct osnoise_params *osnoise_top_parse_args(int argc, char **argv)
params->stop_total_us = get_llong_from_str(optarg);
break;
case 't':
- if (optarg) {
- if (optarg[0] == '=')
- params->trace_output = &optarg[1];
- else
- params->trace_output = &optarg[0];
- } else if (optind < argc && argv[optind][0] != '-')
- params->trace_output = argv[optind];
- else
+ params->trace_output = parse_optional_arg(argc, argv);
+ if (!params->trace_output)
params->trace_output = "osnoise_trace.txt";
break;
case 'T':
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index 9baea1b251ed..ad713dafa3c3 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -713,9 +713,9 @@ static void timerlat_hist_usage(char *usage)
char *msg[] = {
"",
" usage: [rtla] timerlat hist [-h] [-q] [-d s] [-D] [-n] [-a us] [-p us] [-i us] [-T us] [-s us] \\",
- " [-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
+ " [-t [file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
" [-P priority] [-E N] [-b N] [--no-irq] [--no-thread] [--no-header] [--no-summary] \\",
- " [--no-index] [--with-zeros] [--dma-latency us] [-C[=cgroup_name]] [--no-aa] [--dump-task] [-u|-k]",
+ " [--no-index] [--with-zeros] [--dma-latency us] [-C [cgroup_name]] [--no-aa] [--dump-task] [-u|-k]",
" [--warm-up s] [--deepest-idle-state n]",
"",
" -h/--help: print this menu",
@@ -726,11 +726,11 @@ static void timerlat_hist_usage(char *usage)
" -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
" -c/--cpus cpus: run the tracer only on the given cpus",
" -H/--house-keeping cpus: run rtla control threads only on the given cpus",
- " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
+ " -C/--cgroup [cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
" -d/--duration time[m|h|d]: duration of the session in seconds",
" --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)",
" -D/--debug: print debug info",
- " -t/--trace[file]: save the stopped trace to [file|timerlat_trace.txt]",
+ " -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 <filter>: enable a trace event filter to the previous -e event",
" --trigger <trigger>: enable a trace event trigger to the previous -e event",
@@ -885,13 +885,7 @@ static struct timerlat_params
break;
case 'C':
params->cgroup = 1;
- if (!optarg) {
- /* will inherit this cgroup */
- params->cgroup_name = NULL;
- } else if (*optarg == '=') {
- /* skip the = */
- params->cgroup_name = ++optarg;
- }
+ params->cgroup_name = parse_optional_arg(argc, argv);
break;
case 'b':
params->bucket_size = get_llong_from_str(optarg);
@@ -962,14 +956,8 @@ static struct timerlat_params
params->stop_total_us = get_llong_from_str(optarg);
break;
case 't':
- if (optarg) {
- if (optarg[0] == '=')
- trace_output = &optarg[1];
- else
- trace_output = &optarg[0];
- } else if (optind < argc && argv[optind][0] != '-')
- trace_output = argv[optind];
- else
+ trace_output = parse_optional_arg(argc, argv);
+ if (!trace_output)
trace_output = "timerlat_trace.txt";
break;
case 'u':
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index c80b81c0b4da..7f1885018624 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -480,8 +480,8 @@ static void timerlat_top_usage(char *usage)
static const char *const msg[] = {
"",
" usage: rtla timerlat [top] [-h] [-q] [-a us] [-d s] [-D] [-n] [-p us] [-i us] [-T us] [-s us] \\",
- " [[-t[file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
- " [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]] [-u|-k] [--warm-up s] [--deepest-idle-state n]",
+ " [[-t [file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] [-H cpu-list]\\",
+ " [-P priority] [--dma-latency us] [--aa-only us] [-C [cgroup_name]] [-u|-k] [--warm-up s] [--deepest-idle-state n]",
"",
" -h/--help: print this menu",
" -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
@@ -492,11 +492,11 @@ static void timerlat_top_usage(char *usage)
" -s/--stack us: save the stack trace at the IRQ if a thread latency is higher than the argument in us",
" -c/--cpus cpus: run the tracer only on the given cpus",
" -H/--house-keeping cpus: run rtla control threads only on the given cpus",
- " -C/--cgroup[=cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
+ " -C/--cgroup [cgroup_name]: set cgroup, if no cgroup_name is passed, the rtla's cgroup will be inherited",
" -d/--duration time[s|m|h|d]: duration of the session",
" -D/--debug: print debug info",
" --dump-tasks: prints the task running on all CPUs if stop conditions are met (depends on !--no-aa)",
- " -t/--trace[file]: save the stopped trace to [file|timerlat_trace.txt]",
+ " -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",
@@ -650,13 +650,7 @@ static struct timerlat_params
break;
case 'C':
params->cgroup = 1;
- if (!optarg) {
- /* will inherit this cgroup */
- params->cgroup_name = NULL;
- } else if (*optarg == '=') {
- /* skip the = */
- params->cgroup_name = ++optarg;
- }
+ params->cgroup_name = optarg;
break;
case 'D':
config_debug = 1;
@@ -719,14 +713,8 @@ static struct timerlat_params
params->stop_total_us = get_llong_from_str(optarg);
break;
case 't':
- if (optarg) {
- if (optarg[0] == '=')
- trace_output = &optarg[1];
- else
- trace_output = &optarg[0];
- } else if (optind < argc && argv[optind][0] != '-')
- trace_output = argv[optind];
- else
+ trace_output = parse_optional_arg(argc, argv);
+ if (!trace_output)
trace_output = "timerlat_trace.txt";
break;
case 'u':
diff --git a/tools/tracing/rtla/src/utils.c b/tools/tracing/rtla/src/utils.c
index d6ab15dcb490..bd5f34b44648 100644
--- a/tools/tracing/rtla/src/utils.c
+++ b/tools/tracing/rtla/src/utils.c
@@ -959,3 +959,29 @@ int auto_house_keeping(cpu_set_t *monitored_cpus)
return 1;
}
+
+/**
+ * parse_optional_arg - Parse optional argument value
+ *
+ * Parse optional argument value, which can be in the form of:
+ * -sarg, -s/--long=arg, -s/--long arg
+ *
+ * Returns arg value if found, NULL otherwise.
+ */
+char *parse_optional_arg(int argc, char **argv)
+{
+ if (optarg) {
+ if (optarg[0] == '=') {
+ /* skip the = */
+ return &optarg[1];
+ } else {
+ return optarg;
+ }
+ /* parse argument of form -s [arg] and --long [arg]*/
+ } else if (optind < argc && argv[optind][0] != '-') {
+ /* consume optind */
+ return argv[optind++];
+ } else {
+ return NULL;
+ }
+}
diff --git a/tools/tracing/rtla/src/utils.h b/tools/tracing/rtla/src/utils.h
index a2a6f89f342d..d8d83abf0f0d 100644
--- a/tools/tracing/rtla/src/utils.h
+++ b/tools/tracing/rtla/src/utils.h
@@ -24,6 +24,7 @@ long parse_seconds_duration(char *val);
void get_duration(time_t start_time, char *output, int output_size);
int parse_cpu_list(char *cpu_list, char **monitored_cpus);
+char *parse_optional_arg(int argc, char **argv);
long long get_llong_from_str(char *start);
static inline void
--
2.48.1
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