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 <[email protected]> > --- > 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 >
