/* * event tracer * * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> * * - Added format output of fields of the trace point. * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. * */ #define pr_fmt(fmt) fmt #include <linux/workqueue.h>#include <linux/spinlock.h>#include <linux/kthread.h>#include <linux/tracefs.h>#include <linux/uaccess.h>#include <linux/bsearch.h>#include <linux/module.h>#include <linux/ctype.h>#include <linux/sort.h>#include <linux/slab.h>#include <linux/delay.h> #include <trace/events/sched.h> #include <asm/setup.h> #include "trace_output.h" #undef TRACE_SYSTEM#define TRACE_SYSTEM "TRACE_SYSTEM" DEFINE_MUTEX(event_mutex); LIST_HEAD(ftrace_events);static LIST_HEAD(ftrace_generic_fields);static LIST_HEAD(ftrace_common_fields); #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) static struct kmem_cache *field_cachep;static struct kmem_cache *file_cachep; static inline int system_refcount(struct event_subsystem *system){ return system->ref_count;} static int system_refcount_inc(struct event_subsystem *system){ return system->ref_count++;} static int system_refcount_dec(struct event_subsystem *system){ return --system->ref_count;} /* Double loops, do not use break, only goto's work */#define do_for_each_event_file(tr, file) \ list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ list_for_each_entry(file, &tr->events, list) #define do_for_each_event_file_safe(tr, file) \ list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ struct trace_event_file *___n; \ list_for_each_entry_safe(file, ___n, &tr->events, list) #define while_for_each_event_file() \ } static struct list_head *trace_get_fields(struct trace_event_call *event_call){ if (!event_call->class->get_fields) return &event_call->class->fields; return event_call->class->get_fields(event_call);} static struct ftrace_event_field *__find_event_field(struct list_head *head, char *name){ struct ftrace_event_field *field; list_for_each_entry(field, head, link) { if (!strcmp(field->name, name)) return field; } return NULL;} struct ftrace_event_field *trace_find_event_field(struct trace_event_call *call, char *name){ struct ftrace_event_field *field; struct list_head *head; field = __find_event_field(&ftrace_generic_fields, name); if (field) return field; field = __find_event_field(&ftrace_common_fields, name); if (field) return field; head = trace_get_fields(call); return __find_event_field(head, name);} static int __trace_define_field(struct list_head *head, const char *type, const char *name, int offset, int size, int is_signed, int filter_type){ struct ftrace_event_field *field; field = kmem_cache_alloc(field_cachep, GFP_TRACE); if (!field) return -ENOMEM; field->name = name; field->type = type; if (filter_type == FILTER_OTHER) field->filter_type = filter_assign_type(type); else field->filter_type = filter_type; field->offset = offset; field->size = size; field->is_signed = is_signed; list_add(&field->link, head); return 0;} int trace_define_field(struct trace_event_call *call, const char *type, const char *name, int offset, int size, int is_signed, int filter_type){ struct list_head *head; if (WARN_ON(!call->class)) return 0; head = trace_get_fields(call); return __trace_define_field(head, type, name, offset, size, is_signed, filter_type);}EXPORT_SYMBOL_GPL(trace_define_field); #define __generic_field(type, item, filter_type) \ ret = __trace_define_field(&ftrace_generic_fields, #type, \ #item, 0, 0, is_signed_type(type), \ filter_type); \ if (ret) \ return ret; #define __common_field(type, item) \ ret = __trace_define_field(&ftrace_common_fields, #type, \ "common_" #item, \ offsetof(typeof(ent), item), \ sizeof(ent.item), \ is_signed_type(type), FILTER_OTHER); \ if (ret) \ return ret; static int trace_define_generic_fields(void){ int ret; __generic_field(int, cpu, FILTER_OTHER); __generic_field(char *, comm, FILTER_PTR_STRING); return ret;} static int trace_define_common_fields(void){ int ret; struct trace_entry ent; __common_field(unsigned short, type); __common_field(unsigned char, flags); __common_field(unsigned char, preempt_count); __common_field(int, pid); return ret;} static void trace_destroy_fields(struct trace_event_call *call){ struct ftrace_event_field *field, *next; struct list_head *head; head = trace_get_fields(call); list_for_each_entry_safe(field, next, head, link) { list_del(&field->link); kmem_cache_free(field_cachep, field); }} int trace_event_raw_init(struct trace_event_call *call){ int id; id = register_trace_event(&call->event); if (!id) return -ENODEV; return 0;}EXPORT_SYMBOL_GPL(trace_event_raw_init); bool trace_event_ignore_this_pid(struct trace_event_file *trace_file){ struct trace_array *tr = trace_file->tr; struct trace_array_cpu *data; struct trace_pid_list *pid_list; pid_list = rcu_dereference_sched(tr->filtered_pids); if (!pid_list) return false; data = this_cpu_ptr(tr->trace_buffer.data); return data->ignore_pid;}EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, struct trace_event_file *trace_file, unsigned long len){ struct trace_event_call *event_call = trace_file->event_call; if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && trace_event_ignore_this_pid(trace_file)) return NULL; local_save_flags(fbuffer->flags); fbuffer->pc = preempt_count(); fbuffer->trace_file = trace_file; fbuffer->event = trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, event_call->event.type, len, fbuffer->flags, fbuffer->pc); if (!fbuffer->event) return NULL; fbuffer->entry = ring_buffer_event_data(fbuffer->event); return fbuffer->entry;}EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); static DEFINE_SPINLOCK(tracepoint_iter_lock); static void output_printk(struct trace_event_buffer *fbuffer){ struct trace_event_call *event_call; struct trace_event *event; unsigned long flags; struct trace_iterator *iter = tracepoint_print_iter; if (!iter) return; event_call = fbuffer->trace_file->event_call; if (!event_call || !event_call->event.funcs || !event_call->event.funcs->trace) return; event = &fbuffer->trace_file->event_call->event; spin_lock_irqsave(&tracepoint_iter_lock, flags); trace_seq_init(&iter->seq); iter->ent = fbuffer->entry; event_call->event.funcs->trace(iter, 0, event); trace_seq_putc(&iter->seq, 0); printk("%s", iter->seq.buffer); spin_unlock_irqrestore(&tracepoint_iter_lock, flags);} void trace_event_buffer_commit(struct trace_event_buffer *fbuffer){ if (tracepoint_printk) output_printk(fbuffer); event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, fbuffer->event, fbuffer->entry, fbuffer->flags, fbuffer->pc);}EXPORT_SYMBOL_GPL(trace_event_buffer_commit); int trace_event_reg(struct trace_event_call *call, enum trace_reg type, void *data){ struct trace_event_file *file = data; WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); switch (type) { case TRACE_REG_REGISTER: return tracepoint_probe_register(call->tp, call->class->probe, file); case TRACE_REG_UNREGISTER: tracepoint_probe_unregister(call->tp, call->class->probe, file); return 0; #ifdef CONFIG_PERF_EVENTS case TRACE_REG_PERF_REGISTER: return tracepoint_probe_register(call->tp, call->class->perf_probe, call); case TRACE_REG_PERF_UNREGISTER: tracepoint_probe_unregister(call->tp, call->class->perf_probe, call); return 0; case TRACE_REG_PERF_OPEN: case TRACE_REG_PERF_CLOSE: case TRACE_REG_PERF_ADD: case TRACE_REG_PERF_DEL: return 0;#endif } return 0;}EXPORT_SYMBOL_GPL(trace_event_reg); void trace_event_enable_cmd_record(bool enable){ struct trace_event_file *file; struct trace_array *tr; mutex_lock(&event_mutex); do_for_each_event_file(tr, file) { if (!(file->flags & EVENT_FILE_FL_ENABLED)) continue; if (enable) { tracing_start_cmdline_record(); set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } else { tracing_stop_cmdline_record(); clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } } while_for_each_event_file(); mutex_unlock(&event_mutex);} static int __ftrace_event_enable_disable(struct trace_event_file *file, int enable, int soft_disable){ struct trace_event_call *call = file->event_call; struct trace_array *tr = file->tr; int ret = 0; int disable; switch (enable) { case 0: /* * When soft_disable is set and enable is cleared, the sm_ref * reference counter is decremented. If it reaches 0, we want * to clear the SOFT_DISABLED flag but leave the event in the * state that it was. That is, if the event was enabled and * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED * is set we do not want the event to be enabled before we * clear the bit. * * When soft_disable is not set but the SOFT_MODE flag is, * we do nothing. Do not disable the tracepoint, otherwise * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. */ if (soft_disable) { if (atomic_dec_return(&file->sm_ref) > 0) break; disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); } else disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { tracing_stop_cmdline_record(); clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } call->class->reg(call, TRACE_REG_UNREGISTER, file); } /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ if (file->flags & EVENT_FILE_FL_SOFT_MODE) set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); else clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); break; case 1: /* * When soft_disable is set and enable is set, we want to * register the tracepoint for the event, but leave the event * as is. That means, if the event was already enabled, we do * nothing (but set SOFT_MODE). If the event is disabled, we * set SOFT_DISABLED before enabling the event tracepoint, so * it still seems to be disabled. */ if (!soft_disable) clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); else { if (atomic_inc_return(&file->sm_ref) > 1) break; set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); } if (!(file->flags & EVENT_FILE_FL_ENABLED)) { /* Keep the event disabled, when going to SOFT_MODE. */ if (soft_disable) set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { tracing_start_cmdline_record(); set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } ret = call->class->reg(call, TRACE_REG_REGISTER, file); if (ret) { tracing_stop_cmdline_record(); pr_info("event trace: Could not enable event " "%s\n", trace_event_name(call)); break; } set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); /* WAS_ENABLED gets set but never cleared. */ call->flags |= TRACE_EVENT_FL_WAS_ENABLED; } break; } return ret;} int trace_event_enable_disable(struct trace_event_file *file, int enable, int soft_disable){ return __ftrace_event_enable_disable(file, enable, soft_disable);} static int ftrace_event_enable_disable(struct trace_event_file *file, int enable){ return __ftrace_event_enable_disable(file, enable, 0);} static void ftrace_clear_events(struct trace_array *tr){ struct trace_event_file *file; mutex_lock(&event_mutex); list_for_each_entry(file, &tr->events, list) { ftrace_event_enable_disable(file, 0); } mutex_unlock(&event_mutex);} static int cmp_pid(const void *key, const void *elt){ const pid_t *search_pid = key; const pid_t *pid = elt; if (*search_pid == *pid) return 0; if (*search_pid < *pid) return -1; return 1;} static boolcheck_ignore_pid(struct trace_pid_list *filtered_pids, struct task_struct *task){ pid_t search_pid; pid_t *pid; /* * Return false, because if filtered_pids does not exist, * all pids are good to trace. */ if (!filtered_pids) return false; search_pid = task->pid; pid = bsearch(&search_pid, filtered_pids->pids, filtered_pids->nr_pids, sizeof(pid_t),Lines 1–500 of 3436. Load more
/* * event tracer * * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> * * - Added format output of fields of the trace point. * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. * */ #define pr_fmt(fmt) fmt #include <linux/workqueue.h> #include <linux/spinlock.h> #include <linux/kthread.h> #include <linux/tracefs.h> #include <linux/uaccess.h> #include <linux/bsearch.h> #include <linux/module.h> #include <linux/ctype.h> #include <linux/sort.h> #include <linux/slab.h> #include <linux/delay.h> #include <trace/events/sched.h> #include <asm/setup.h> #include "trace_output.h" #undef TRACE_SYSTEM #define TRACE_SYSTEM "TRACE_SYSTEM" DEFINE_MUTEX(event_mutex); LIST_HEAD(ftrace_events); static LIST_HEAD(ftrace_generic_fields); static LIST_HEAD(ftrace_common_fields); #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) static struct kmem_cache *field_cachep; static struct kmem_cache *file_cachep; static inline int system_refcount(struct event_subsystem *system) { return system->ref_count; } static int system_refcount_inc(struct event_subsystem *system) { return system->ref_count++; } static int system_refcount_dec(struct event_subsystem *system) { return --system->ref_count; } /* Double loops, do not use break, only goto's work */ #define do_for_each_event_file(tr, file) \ list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ list_for_each_entry(file, &tr->events, list) #define do_for_each_event_file_safe(tr, file) \ list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ struct trace_event_file *___n; \ list_for_each_entry_safe(file, ___n, &tr->events, list) #define while_for_each_event_file() \ } static struct list_head * trace_get_fields(struct trace_event_call *event_call) { if (!event_call->class->get_fields) return &event_call->class->fields; return event_call->class->get_fields(event_call); } static struct ftrace_event_field * __find_event_field(struct list_head *head, char *name) { struct ftrace_event_field *field; list_for_each_entry(field, head, link) { if (!strcmp(field->name, name)) return field; } return NULL; } struct ftrace_event_field * trace_find_event_field(struct trace_event_call *call, char *name) { struct ftrace_event_field *field; struct list_head *head; field = __find_event_field(&ftrace_generic_fields, name); if (field) return field; field = __find_event_field(&ftrace_common_fields, name); if (field) return field; head = trace_get_fields(call); return __find_event_field(head, name); } static int __trace_define_field(struct list_head *head, const char *type, const char *name, int offset, int size, int is_signed, int filter_type) { struct ftrace_event_field *field; field = kmem_cache_alloc(field_cachep, GFP_TRACE); if (!field) return -ENOMEM; field->name = name; field->type = type; if (filter_type == FILTER_OTHER) field->filter_type = filter_assign_type(type); else field->filter_type = filter_type; field->offset = offset; field->size = size; field->is_signed = is_signed; list_add(&field->link, head); return 0; } int trace_define_field(struct trace_event_call *call, const char *type, const char *name, int offset, int size, int is_signed, int filter_type) { struct list_head *head; if (WARN_ON(!call->class)) return 0; head = trace_get_fields(call); return __trace_define_field(head, type, name, offset, size, is_signed, filter_type); } EXPORT_SYMBOL_GPL(trace_define_field); #define __generic_field(type, item, filter_type) \ ret = __trace_define_field(&ftrace_generic_fields, #type, \ #item, 0, 0, is_signed_type(type), \ filter_type); \ if (ret) \ return ret; #define __common_field(type, item) \ ret = __trace_define_field(&ftrace_common_fields, #type, \ "common_" #item, \ offsetof(typeof(ent), item), \ sizeof(ent.item), \ is_signed_type(type), FILTER_OTHER); \ if (ret) \ return ret; static int trace_define_generic_fields(void) { int ret; __generic_field(int, cpu, FILTER_OTHER); __generic_field(char *, comm, FILTER_PTR_STRING); return ret; } static int trace_define_common_fields(void) { int ret; struct trace_entry ent; __common_field(unsigned short, type); __common_field(unsigned char, flags); __common_field(unsigned char, preempt_count); __common_field(int, pid); return ret; } static void trace_destroy_fields(struct trace_event_call *call) { struct ftrace_event_field *field, *next; struct list_head *head; head = trace_get_fields(call); list_for_each_entry_safe(field, next, head, link) { list_del(&field->link); kmem_cache_free(field_cachep, field); } } int trace_event_raw_init(struct trace_event_call *call) { int id; id = register_trace_event(&call->event); if (!id) return -ENODEV; return 0; } EXPORT_SYMBOL_GPL(trace_event_raw_init); bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) { struct trace_array *tr = trace_file->tr; struct trace_array_cpu *data; struct trace_pid_list *pid_list; pid_list = rcu_dereference_sched(tr->filtered_pids); if (!pid_list) return false; data = this_cpu_ptr(tr->trace_buffer.data); return data->ignore_pid; } EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, struct trace_event_file *trace_file, unsigned long len) { struct trace_event_call *event_call = trace_file->event_call; if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && trace_event_ignore_this_pid(trace_file)) return NULL; local_save_flags(fbuffer->flags); fbuffer->pc = preempt_count(); fbuffer->trace_file = trace_file; fbuffer->event = trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, event_call->event.type, len, fbuffer->flags, fbuffer->pc); if (!fbuffer->event) return NULL; fbuffer->entry = ring_buffer_event_data(fbuffer->event); return fbuffer->entry; } EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); static DEFINE_SPINLOCK(tracepoint_iter_lock); static void output_printk(struct trace_event_buffer *fbuffer) { struct trace_event_call *event_call; struct trace_event *event; unsigned long flags; struct trace_iterator *iter = tracepoint_print_iter; if (!iter) return; event_call = fbuffer->trace_file->event_call; if (!event_call || !event_call->event.funcs || !event_call->event.funcs->trace) return; event = &fbuffer->trace_file->event_call->event; spin_lock_irqsave(&tracepoint_iter_lock, flags); trace_seq_init(&iter->seq); iter->ent = fbuffer->entry; event_call->event.funcs->trace(iter, 0, event); trace_seq_putc(&iter->seq, 0); printk("%s", iter->seq.buffer); spin_unlock_irqrestore(&tracepoint_iter_lock, flags); } void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) { if (tracepoint_printk) output_printk(fbuffer); event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, fbuffer->event, fbuffer->entry, fbuffer->flags, fbuffer->pc); } EXPORT_SYMBOL_GPL(trace_event_buffer_commit); int trace_event_reg(struct trace_event_call *call, enum trace_reg type, void *data) { struct trace_event_file *file = data; WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); switch (type) { case TRACE_REG_REGISTER: return tracepoint_probe_register(call->tp, call->class->probe, file); case TRACE_REG_UNREGISTER: tracepoint_probe_unregister(call->tp, call->class->probe, file); return 0; #ifdef CONFIG_PERF_EVENTS case TRACE_REG_PERF_REGISTER: return tracepoint_probe_register(call->tp, call->class->perf_probe, call); case TRACE_REG_PERF_UNREGISTER: tracepoint_probe_unregister(call->tp, call->class->perf_probe, call); return 0; case TRACE_REG_PERF_OPEN: case TRACE_REG_PERF_CLOSE: case TRACE_REG_PERF_ADD: case TRACE_REG_PERF_DEL: return 0; #endif } return 0; } EXPORT_SYMBOL_GPL(trace_event_reg); void trace_event_enable_cmd_record(bool enable) { struct trace_event_file *file; struct trace_array *tr; mutex_lock(&event_mutex); do_for_each_event_file(tr, file) { if (!(file->flags & EVENT_FILE_FL_ENABLED)) continue; if (enable) { tracing_start_cmdline_record(); set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } else { tracing_stop_cmdline_record(); clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } } while_for_each_event_file(); mutex_unlock(&event_mutex); } static int __ftrace_event_enable_disable(struct trace_event_file *file, int enable, int soft_disable) { struct trace_event_call *call = file->event_call; struct trace_array *tr = file->tr; int ret = 0; int disable; switch (enable) { case 0: /* * When soft_disable is set and enable is cleared, the sm_ref * reference counter is decremented. If it reaches 0, we want * to clear the SOFT_DISABLED flag but leave the event in the * state that it was. That is, if the event was enabled and * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED * is set we do not want the event to be enabled before we * clear the bit. * * When soft_disable is not set but the SOFT_MODE flag is, * we do nothing. Do not disable the tracepoint, otherwise * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. */ if (soft_disable) { if (atomic_dec_return(&file->sm_ref) > 0) break; disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); } else disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { tracing_stop_cmdline_record(); clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } call->class->reg(call, TRACE_REG_UNREGISTER, file); } /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ if (file->flags & EVENT_FILE_FL_SOFT_MODE) set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); else clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); break; case 1: /* * When soft_disable is set and enable is set, we want to * register the tracepoint for the event, but leave the event * as is. That means, if the event was already enabled, we do * nothing (but set SOFT_MODE). If the event is disabled, we * set SOFT_DISABLED before enabling the event tracepoint, so * it still seems to be disabled. */ if (!soft_disable) clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); else { if (atomic_inc_return(&file->sm_ref) > 1) break; set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); } if (!(file->flags & EVENT_FILE_FL_ENABLED)) { /* Keep the event disabled, when going to SOFT_MODE. */ if (soft_disable) set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { tracing_start_cmdline_record(); set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); } ret = call->class->reg(call, TRACE_REG_REGISTER, file); if (ret) { tracing_stop_cmdline_record(); pr_info("event trace: Could not enable event " "%s\n", trace_event_name(call)); break; } set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); /* WAS_ENABLED gets set but never cleared. */ call->flags |= TRACE_EVENT_FL_WAS_ENABLED; } break; } return ret; } int trace_event_enable_disable(struct trace_event_file *file, int enable, int soft_disable) { return __ftrace_event_enable_disable(file, enable, soft_disable); } static int ftrace_event_enable_disable(struct trace_event_file *file, int enable) { return __ftrace_event_enable_disable(file, enable, 0); } static void ftrace_clear_events(struct trace_array *tr) { struct trace_event_file *file; mutex_lock(&event_mutex); list_for_each_entry(file, &tr->events, list) { ftrace_event_enable_disable(file, 0); } mutex_unlock(&event_mutex); } static int cmp_pid(const void *key, const void *elt) { const pid_t *search_pid = key; const pid_t *pid = elt; if (*search_pid == *pid) return 0; if (*search_pid < *pid) return -1; return 1; } static bool check_ignore_pid(struct trace_pid_list *filtered_pids, struct task_struct *task) { pid_t search_pid; pid_t *pid; /* * Return false, because if filtered_pids does not exist, * all pids are good to trace. */ if (!filtered_pids) return false; search_pid = task->pid; pid = bsearch(&search_pid, filtered_pids->pids, filtered_pids->nr_pids, sizeof(pid_t),