From ccb6754495ef253af5e1253434f0d21b6225c4ad Mon Sep 17 00:00:00 2001 From: Daniel Bristot de Oliveira Date: Sun, 31 Oct 2021 19:05:01 +0100 Subject: tracing/osnoise: Remove TIMERLAT ifdefs from inside functions Remove CONFIG_TIMERLAT_TRACER from inside functions, avoiding compilation problems in the future. Link: https://lkml.kernel.org/r/8245abb5a112d249f5da6c1df499244ad9e647bc.1635702894.git.bristot@kernel.org Cc: Ingo Molnar Cc: Tom Zanussi Cc: Masami Hiramatsu Cc: Juri Lelli Cc: Clark Williams Cc: John Kacur Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Sebastian Andrzej Siewior Cc: Daniel Bristot de Oliveira Cc: linux-rt-users@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Suggested-by: Steven Rostedt Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace_osnoise.c | 150 ++++++++++++++++++++++++++++++------------- 1 file changed, 106 insertions(+), 44 deletions(-) (limited to 'kernel/trace') diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c index 490615f6d721..5e832e3edf1f 100644 --- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -321,6 +321,57 @@ static struct osnoise_data { #endif }; +#ifdef CONFIG_TIMERLAT_TRACER +static inline bool timerlat_enabled(void) +{ + return osnoise_data.timerlat_tracer; +} + +static inline int timerlat_softirq_exit(struct osnoise_variables *osn_var) +{ + struct timerlat_variables *tlat_var = this_cpu_tmr_var(); + /* + * If the timerlat is enabled, but the irq handler did + * not run yet enabling timerlat_tracer, do not trace. + */ + if (!tlat_var->tracing_thread) { + osn_var->softirq.arrival_time = 0; + osn_var->softirq.delta_start = 0; + return 0; + } + return 1; +} + +static inline int timerlat_thread_exit(struct osnoise_variables *osn_var) +{ + struct timerlat_variables *tlat_var = this_cpu_tmr_var(); + /* + * If the timerlat is enabled, but the irq handler did + * not run yet enabling timerlat_tracer, do not trace. + */ + if (!tlat_var->tracing_thread) { + osn_var->thread.delta_start = 0; + osn_var->thread.arrival_time = 0; + return 0; + } + return 1; +} +#else /* CONFIG_TIMERLAT_TRACER */ +static inline bool timerlat_enabled(void) +{ + return false; +} + +static inline int timerlat_softirq_exit(struct osnoise_variables *osn_var) +{ + return 1; +} +static inline int timerlat_thread_exit(struct osnoise_variables *osn_var) +{ + return 1; +} +#endif + #ifdef CONFIG_PREEMPT_RT /* * Print the osnoise header info. @@ -978,21 +1029,9 @@ static void trace_softirq_exit_callback(void *data, unsigned int vec_nr) if (!osn_var->sampling) return; -#ifdef CONFIG_TIMERLAT_TRACER - /* - * If the timerlat is enabled, but the irq handler did - * not run yet enabling timerlat_tracer, do not trace. - */ - if (unlikely(osnoise_data.timerlat_tracer)) { - struct timerlat_variables *tlat_var; - tlat_var = this_cpu_tmr_var(); - if (!tlat_var->tracing_thread) { - osn_var->softirq.arrival_time = 0; - osn_var->softirq.delta_start = 0; + if (unlikely(timerlat_enabled())) + if (!timerlat_softirq_exit(osn_var)) return; - } - } -#endif duration = get_int_safe_duration(osn_var, &osn_var->softirq.delta_start); trace_softirq_noise(vec_nr, osn_var->softirq.arrival_time, duration); @@ -1086,17 +1125,9 @@ thread_exit(struct osnoise_variables *osn_var, struct task_struct *t) if (!osn_var->sampling) return; -#ifdef CONFIG_TIMERLAT_TRACER - if (osnoise_data.timerlat_tracer) { - struct timerlat_variables *tlat_var; - tlat_var = this_cpu_tmr_var(); - if (!tlat_var->tracing_thread) { - osn_var->thread.delta_start = 0; - osn_var->thread.arrival_time = 0; + if (unlikely(timerlat_enabled())) + if (!timerlat_thread_exit(osn_var)) return; - } - } -#endif duration = get_int_safe_duration(osn_var, &osn_var->thread.delta_start); @@ -1600,6 +1631,11 @@ static int timerlat_main(void *data) hrtimer_cancel(&tlat->timer); return 0; } +#else /* CONFIG_TIMERLAT_TRACER */ +static int timerlat_main(void *data) +{ + return 0; +} #endif /* CONFIG_TIMERLAT_TRACER */ /* @@ -1642,16 +1678,13 @@ static int start_kthread(unsigned int cpu) void *main = osnoise_main; char comm[24]; -#ifdef CONFIG_TIMERLAT_TRACER - if (osnoise_data.timerlat_tracer) { + if (timerlat_enabled()) { snprintf(comm, 24, "timerlat/%d", cpu); main = timerlat_main; } else { snprintf(comm, 24, "osnoise/%d", cpu); } -#else - snprintf(comm, 24, "osnoise/%d", cpu); -#endif + kthread = kthread_create_on_cpu(main, NULL, cpu, comm); if (IS_ERR(kthread)) { @@ -1945,6 +1978,35 @@ static const struct file_operations cpus_fops = { .llseek = generic_file_llseek, }; +#ifdef CONFIG_TIMERLAT_TRACER +/* + * init_timerlat_tracefs - A function to initialize the timerlat interface files + */ +static int init_timerlat_tracefs(struct dentry *top_dir) +{ + struct dentry *tmp; + +#ifdef CONFIG_STACKTRACE + tmp = tracefs_create_file("print_stack", TRACE_MODE_WRITE, top_dir, + &osnoise_print_stack, &trace_min_max_fops); + if (!tmp) + return -ENOMEM; +#endif + + tmp = tracefs_create_file("timerlat_period_us", TRACE_MODE_WRITE, top_dir, + &timerlat_period, &trace_min_max_fops); + if (!tmp) + return -ENOMEM; + + return 0; +} +#else /* CONFIG_TIMERLAT_TRACER */ +static int init_timerlat_tracefs(struct dentry *top_dir) +{ + return 0; +} +#endif /* CONFIG_TIMERLAT_TRACER */ + /* * init_tracefs - A function to initialize the tracefs interface files * @@ -1989,19 +2051,10 @@ static int init_tracefs(void) tmp = trace_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops); if (!tmp) goto err; -#ifdef CONFIG_TIMERLAT_TRACER -#ifdef CONFIG_STACKTRACE - tmp = tracefs_create_file("print_stack", TRACE_MODE_WRITE, top_dir, - &osnoise_print_stack, &trace_min_max_fops); - if (!tmp) - goto err; -#endif - tmp = tracefs_create_file("timerlat_period_us", TRACE_MODE_WRITE, top_dir, - &timerlat_period, &trace_min_max_fops); - if (!tmp) + ret = init_timerlat_tracefs(top_dir); + if (ret) goto err; -#endif return 0; @@ -2207,6 +2260,16 @@ static struct tracer timerlat_tracer __read_mostly = { .print_header = print_timerlat_headers, .allow_instances = true, }; + +__init static int init_timerlat_tracer(void) +{ + return register_tracer(&timerlat_tracer); +} +#else /* CONFIG_TIMERLAT_TRACER */ +__init static int init_timerlat_tracer(void) +{ + return 0; +} #endif /* CONFIG_TIMERLAT_TRACER */ __init static int init_osnoise_tracer(void) @@ -2223,13 +2286,12 @@ __init static int init_osnoise_tracer(void) return ret; } -#ifdef CONFIG_TIMERLAT_TRACER - ret = register_tracer(&timerlat_tracer); + ret = init_timerlat_tracer(); if (ret) { - pr_err(BANNER "Error registering timerlat\n"); + pr_err(BANNER "Error registering timerlat!\n"); return ret; } -#endif + osnoise_init_hotplug_support(); INIT_LIST_HEAD_RCU(&osnoise_instances); -- cgit v1.2.3