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Message-ID: <aYxh8jbeDENgZ9ht@fedora>
Date: Wed, 11 Feb 2026 08:03:48 -0300
From: Wander Lairson Costa <wander@...hat.com>
To: Costa Shulyupin <costa.shul@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Tomas Glozar <tglozar@...hat.com>, Crystal Wood <crwood@...hat.com>,
Ivan Pravdin <ipravdin.official@...il.com>, John Kacur <jkacur@...hat.com>,
Tiezhu Yang <yangtiezhu@...ngson.cn>, linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org
Subject: Re: [PATCH v2 2/4] tools/rtla: Remove unneeded nr_cpus arguments
On Mon, Feb 09, 2026 at 11:24:34AM +0200, Costa Shulyupin wrote:
> nr_cpus does not change at runtime, so passing it through function
> arguments is unnecessary.
>
> Use the global nr_cpus instead of propagating it via parameters.
The parameter should also be removed from timerlat_bpf_get_hist_value(),
shouldn't it?
>
> Signed-off-by: Costa Shulyupin <costa.shul@...hat.com>
> ---
> tools/tracing/rtla/src/osnoise_hist.c | 4 ++--
> tools/tracing/rtla/src/osnoise_top.c | 4 ++--
> tools/tracing/rtla/src/timerlat_bpf.c | 5 ++---
> tools/tracing/rtla/src/timerlat_bpf.h | 6 ++----
> tools/tracing/rtla/src/timerlat_hist.c | 19 +++++++------------
> tools/tracing/rtla/src/timerlat_top.c | 19 +++++++------------
> tools/tracing/rtla/src/timerlat_u.c | 6 +++---
> 7 files changed, 25 insertions(+), 38 deletions(-)
>
> diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
> index 03ebff34fff4..d83ee047a5f5 100644
> --- a/tools/tracing/rtla/src/osnoise_hist.c
> +++ b/tools/tracing/rtla/src/osnoise_hist.c
> @@ -62,7 +62,7 @@ static void osnoise_free_hist_tool(struct osnoise_tool *tool)
> * osnoise_alloc_histogram - alloc runtime data
> */
> static struct osnoise_hist_data
> -*osnoise_alloc_histogram(int nr_cpus, int entries, int bucket_size)
> +*osnoise_alloc_histogram(int entries, int bucket_size)
> {
> struct osnoise_hist_data *data;
> int cpu;
> @@ -652,7 +652,7 @@ static struct osnoise_tool
> if (!tool)
> return NULL;
>
> - tool->data = osnoise_alloc_histogram(nr_cpus, params->hist.entries,
> + tool->data = osnoise_alloc_histogram(params->hist.entries,
> params->hist.bucket_size);
> if (!tool->data)
> goto out_err;
> diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
> index 7dcd2e318205..73b3ac0dd43b 100644
> --- a/tools/tracing/rtla/src/osnoise_top.c
> +++ b/tools/tracing/rtla/src/osnoise_top.c
> @@ -51,7 +51,7 @@ static void osnoise_free_top_tool(struct osnoise_tool *tool)
> /*
> * osnoise_alloc_histogram - alloc runtime data
> */
> -static struct osnoise_top_data *osnoise_alloc_top(int nr_cpus)
> +static struct osnoise_top_data *osnoise_alloc_top(void)
> {
> struct osnoise_top_data *data;
>
> @@ -496,7 +496,7 @@ struct osnoise_tool *osnoise_init_top(struct common_params *params)
> if (!tool)
> return NULL;
>
> - tool->data = osnoise_alloc_top(nr_cpus);
> + tool->data = osnoise_alloc_top();
> if (!tool->data) {
> osnoise_destroy_tool(tool);
> return NULL;
> diff --git a/tools/tracing/rtla/src/timerlat_bpf.c b/tools/tracing/rtla/src/timerlat_bpf.c
> index 05adf18303df..8d5c3a095e41 100644
> --- a/tools/tracing/rtla/src/timerlat_bpf.c
> +++ b/tools/tracing/rtla/src/timerlat_bpf.c
> @@ -191,13 +191,12 @@ int timerlat_bpf_get_hist_value(int key,
> int timerlat_bpf_get_summary_value(enum summary_field key,
> long long *value_irq,
> long long *value_thread,
> - long long *value_user,
> - int cpus)
> + long long *value_user)
> {
> return get_value(bpf->maps.summary_irq,
> bpf->maps.summary_thread,
> bpf->maps.summary_user,
> - key, value_irq, value_thread, value_user, cpus);
> + key, value_irq, value_thread, value_user, nr_cpus);
> }
>
> /*
> diff --git a/tools/tracing/rtla/src/timerlat_bpf.h b/tools/tracing/rtla/src/timerlat_bpf.h
> index 169abeaf4363..f4a5476f2abb 100644
> --- a/tools/tracing/rtla/src/timerlat_bpf.h
> +++ b/tools/tracing/rtla/src/timerlat_bpf.h
> @@ -28,8 +28,7 @@ int timerlat_bpf_get_hist_value(int key,
> int timerlat_bpf_get_summary_value(enum summary_field key,
> long long *value_irq,
> long long *value_thread,
> - long long *value_user,
> - int cpus);
> + long long *value_user);
> int timerlat_load_bpf_action_program(const char *program_path);
> static inline int have_libbpf_support(void) { return 1; }
> #else
> @@ -53,8 +52,7 @@ static inline int timerlat_bpf_get_hist_value(int key,
> static inline int timerlat_bpf_get_summary_value(enum summary_field key,
> long long *value_irq,
> long long *value_thread,
> - long long *value_user,
> - int cpus)
> + long long *value_user)
> {
> return -1;
> }
> diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
> index 841118ed84f2..dee5fbf622c3 100644
> --- a/tools/tracing/rtla/src/timerlat_hist.c
> +++ b/tools/tracing/rtla/src/timerlat_hist.c
> @@ -83,7 +83,7 @@ static void timerlat_free_histogram_tool(struct osnoise_tool *tool)
> * timerlat_alloc_histogram - alloc runtime data
> */
> static struct timerlat_hist_data
> -*timerlat_alloc_histogram(int nr_cpus, int entries, int bucket_size)
> +*timerlat_alloc_histogram(int entries, int bucket_size)
> {
> struct timerlat_hist_data *data;
> int cpu;
> @@ -223,8 +223,7 @@ static int timerlat_hist_bpf_pull_data(struct osnoise_tool *tool)
>
> /* Pull summary */
> err = timerlat_bpf_get_summary_value(SUMMARY_COUNT,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -234,8 +233,7 @@ static int timerlat_hist_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_MIN,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -245,8 +243,7 @@ static int timerlat_hist_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_MAX,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -256,8 +253,7 @@ static int timerlat_hist_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_SUM,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -267,8 +263,7 @@ static int timerlat_hist_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_OVERFLOW,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -1036,7 +1031,7 @@ static struct osnoise_tool
> if (!tool)
> return NULL;
>
> - tool->data = timerlat_alloc_histogram(nr_cpus, params->hist.entries,
> + tool->data = timerlat_alloc_histogram(params->hist.entries,
> params->hist.bucket_size);
> if (!tool->data)
> goto out_err;
> diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
> index 3e395ce4fa9f..25b4d81b4fe0 100644
> --- a/tools/tracing/rtla/src/timerlat_top.c
> +++ b/tools/tracing/rtla/src/timerlat_top.c
> @@ -62,7 +62,7 @@ static void timerlat_free_top_tool(struct osnoise_tool *tool)
> /*
> * timerlat_alloc_histogram - alloc runtime data
> */
> -static struct timerlat_top_data *timerlat_alloc_top(int nr_cpus)
> +static struct timerlat_top_data *timerlat_alloc_top(void)
> {
> struct timerlat_top_data *data;
> int cpu;
> @@ -196,8 +196,7 @@ static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
>
> /* Pull summary */
> err = timerlat_bpf_get_summary_value(SUMMARY_CURRENT,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -207,8 +206,7 @@ static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_COUNT,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -218,8 +216,7 @@ static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_MIN,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -229,8 +226,7 @@ static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_MAX,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -240,8 +236,7 @@ static int timerlat_top_bpf_pull_data(struct osnoise_tool *tool)
> }
>
> err = timerlat_bpf_get_summary_value(SUMMARY_SUM,
> - value_irq, value_thread, value_user,
> - data->nr_cpus);
> + value_irq, value_thread, value_user);
> if (err)
> return err;
> for (i = 0; i < data->nr_cpus; i++) {
> @@ -782,7 +777,7 @@ static struct osnoise_tool
> if (!top)
> return NULL;
>
> - top->data = timerlat_alloc_top(nr_cpus);
> + top->data = timerlat_alloc_top();
> if (!top->data)
> goto out_err;
>
> diff --git a/tools/tracing/rtla/src/timerlat_u.c b/tools/tracing/rtla/src/timerlat_u.c
> index a569fe7f93aa..03b4e68e8b1e 100644
> --- a/tools/tracing/rtla/src/timerlat_u.c
> +++ b/tools/tracing/rtla/src/timerlat_u.c
> @@ -99,7 +99,7 @@ static int timerlat_u_main(int cpu, struct timerlat_u_params *params)
> *
> * Return the number of processes that received the kill.
> */
> -static int timerlat_u_send_kill(pid_t *procs, int nr_cpus)
> +static int timerlat_u_send_kill(pid_t *procs)
> {
> int killed = 0;
> int i, retval;
> @@ -169,7 +169,7 @@ void *timerlat_u_dispatcher(void *data)
>
> /* parent */
> if (pid == -1) {
> - timerlat_u_send_kill(procs, nr_cpus);
> + timerlat_u_send_kill(procs);
> debug_msg("Failed to create child processes");
> pthread_exit(&retval);
> }
> @@ -196,7 +196,7 @@ void *timerlat_u_dispatcher(void *data)
> sleep(1);
> }
>
> - timerlat_u_send_kill(procs, nr_cpus);
> + timerlat_u_send_kill(procs);
>
> while (procs_count) {
> pid = waitpid(-1, &wstatus, 0);
> --
> 2.52.0
>
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