diff options
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r-- | kernel/trace/trace.c | 364 |
1 files changed, 222 insertions, 142 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 1122f151466f..948ec32e0c27 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -87,7 +87,7 @@ dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) * tracing is active, only save the comm when a trace event * occurred. */ -static DEFINE_PER_CPU(bool, trace_cmdline_save); +static DEFINE_PER_CPU(bool, trace_taskinfo_save); /* * Kill all tracing for good (never come back). @@ -120,41 +120,41 @@ enum ftrace_dump_mode ftrace_dump_on_oops; /* When set, tracing will stop when a WARN*() is hit */ int __disable_trace_on_warning; -#ifdef CONFIG_TRACE_ENUM_MAP_FILE -/* Map of enums to their values, for "enum_map" file */ -struct trace_enum_map_head { +#ifdef CONFIG_TRACE_EVAL_MAP_FILE +/* Map of enums to their values, for "eval_map" file */ +struct trace_eval_map_head { struct module *mod; unsigned long length; }; -union trace_enum_map_item; +union trace_eval_map_item; -struct trace_enum_map_tail { +struct trace_eval_map_tail { /* * "end" is first and points to NULL as it must be different - * than "mod" or "enum_string" + * than "mod" or "eval_string" */ - union trace_enum_map_item *next; + union trace_eval_map_item *next; const char *end; /* points to NULL */ }; -static DEFINE_MUTEX(trace_enum_mutex); +static DEFINE_MUTEX(trace_eval_mutex); /* - * The trace_enum_maps are saved in an array with two extra elements, + * The trace_eval_maps are saved in an array with two extra elements, * one at the beginning, and one at the end. The beginning item contains * the count of the saved maps (head.length), and the module they * belong to if not built in (head.mod). The ending item contains a - * pointer to the next array of saved enum_map items. + * pointer to the next array of saved eval_map items. */ -union trace_enum_map_item { - struct trace_enum_map map; - struct trace_enum_map_head head; - struct trace_enum_map_tail tail; +union trace_eval_map_item { + struct trace_eval_map map; + struct trace_eval_map_head head; + struct trace_eval_map_tail tail; }; -static union trace_enum_map_item *trace_enum_maps; -#endif /* CONFIG_TRACE_ENUM_MAP_FILE */ +static union trace_eval_map_item *trace_eval_maps; +#endif /* CONFIG_TRACE_EVAL_MAP_FILE */ static int tracing_set_tracer(struct trace_array *tr, const char *buf); @@ -790,7 +790,7 @@ EXPORT_SYMBOL_GPL(tracing_on); static __always_inline void __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event) { - __this_cpu_write(trace_cmdline_save, true); + __this_cpu_write(trace_taskinfo_save, true); /* If this is the temp buffer, we need to commit fully */ if (this_cpu_read(trace_buffered_event) == event) { @@ -1141,9 +1141,9 @@ unsigned long nsecs_to_usecs(unsigned long nsecs) /* * TRACE_FLAGS is defined as a tuple matching bit masks with strings. - * It uses C(a, b) where 'a' is the enum name and 'b' is the string that + * It uses C(a, b) where 'a' is the eval (enum) name and 'b' is the string that * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list - * of strings in the order that the enums were defined. + * of strings in the order that the evals (enum) were defined. */ #undef C #define C(a, b) b @@ -1709,6 +1709,8 @@ void tracing_reset_all_online_cpus(void) } } +static int *tgid_map; + #define SAVED_CMDLINES_DEFAULT 128 #define NO_CMDLINE_MAP UINT_MAX static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; @@ -1722,7 +1724,7 @@ struct saved_cmdlines_buffer { static struct saved_cmdlines_buffer *savedcmd; /* temporary disable recording */ -static atomic_t trace_record_cmdline_disabled __read_mostly; +static atomic_t trace_record_taskinfo_disabled __read_mostly; static inline char *get_saved_cmdlines(int idx) { @@ -1910,8 +1912,6 @@ static void tracing_stop_tr(struct trace_array *tr) raw_spin_unlock_irqrestore(&tr->start_lock, flags); } -void trace_stop_cmdline_recording(void); - static int trace_save_cmdline(struct task_struct *tsk) { unsigned pid, idx; @@ -1992,16 +1992,87 @@ void trace_find_cmdline(int pid, char comm[]) preempt_enable(); } -void tracing_record_cmdline(struct task_struct *tsk) +int trace_find_tgid(int pid) +{ + if (unlikely(!tgid_map || !pid || pid > PID_MAX_DEFAULT)) + return 0; + + return tgid_map[pid]; +} + +static int trace_save_tgid(struct task_struct *tsk) +{ + if (unlikely(!tgid_map || !tsk->pid || tsk->pid > PID_MAX_DEFAULT)) + return 0; + + tgid_map[tsk->pid] = tsk->tgid; + return 1; +} + +static bool tracing_record_taskinfo_skip(int flags) +{ + if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID)))) + return true; + if (atomic_read(&trace_record_taskinfo_disabled) || !tracing_is_on()) + return true; + if (!__this_cpu_read(trace_taskinfo_save)) + return true; + return false; +} + +/** + * tracing_record_taskinfo - record the task info of a task + * + * @task - task to record + * @flags - TRACE_RECORD_CMDLINE for recording comm + * - TRACE_RECORD_TGID for recording tgid + */ +void tracing_record_taskinfo(struct task_struct *task, int flags) +{ + if (tracing_record_taskinfo_skip(flags)) + return; + if ((flags & TRACE_RECORD_CMDLINE) && !trace_save_cmdline(task)) + return; + if ((flags & TRACE_RECORD_TGID) && !trace_save_tgid(task)) + return; + + __this_cpu_write(trace_taskinfo_save, false); +} + +/** + * tracing_record_taskinfo_sched_switch - record task info for sched_switch + * + * @prev - previous task during sched_switch + * @next - next task during sched_switch + * @flags - TRACE_RECORD_CMDLINE for recording comm + * TRACE_RECORD_TGID for recording tgid + */ +void tracing_record_taskinfo_sched_switch(struct task_struct *prev, + struct task_struct *next, int flags) { - if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on()) + if (tracing_record_taskinfo_skip(flags)) return; - if (!__this_cpu_read(trace_cmdline_save)) + if ((flags & TRACE_RECORD_CMDLINE) && + (!trace_save_cmdline(prev) || !trace_save_cmdline(next))) return; - if (trace_save_cmdline(tsk)) - __this_cpu_write(trace_cmdline_save, false); + if ((flags & TRACE_RECORD_TGID) && + (!trace_save_tgid(prev) || !trace_save_tgid(next))) + return; + + __this_cpu_write(trace_taskinfo_save, false); +} + +/* Helpers to record a specific task information */ +void tracing_record_cmdline(struct task_struct *task) +{ + tracing_record_taskinfo(task, TRACE_RECORD_CMDLINE); +} + +void tracing_record_tgid(struct task_struct *task) +{ + tracing_record_taskinfo(task, TRACE_RECORD_TGID); } /* @@ -3146,7 +3217,7 @@ static void *s_start(struct seq_file *m, loff_t *pos) #endif if (!iter->snapshot) - atomic_inc(&trace_record_cmdline_disabled); + atomic_inc(&trace_record_taskinfo_disabled); if (*pos != iter->pos) { iter->ent = NULL; @@ -3191,7 +3262,7 @@ static void s_stop(struct seq_file *m, void *p) #endif if (!iter->snapshot) - atomic_dec(&trace_record_cmdline_disabled); + atomic_dec(&trace_record_taskinfo_disabled); trace_access_unlock(iter->cpu_file); trace_event_read_unlock(); @@ -3248,23 +3319,29 @@ static void print_event_info(struct trace_buffer *buf, struct seq_file *m) seq_puts(m, "#\n"); } -static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m) +static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m, + unsigned int flags) { + bool tgid = flags & TRACE_ITER_RECORD_TGID; + print_event_info(buf, m); - seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n" - "# | | | | |\n"); + + seq_printf(m, "# TASK-PID CPU# %s TIMESTAMP FUNCTION\n", tgid ? "TGID " : ""); + seq_printf(m, "# | | | %s | |\n", tgid ? " | " : ""); } -static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m) +static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m, + unsigned int flags) { - print_event_info(buf, m); - seq_puts(m, "# _-----=> irqs-off\n" - "# / _----=> need-resched\n" - "# | / _---=> hardirq/softirq\n" - "# || / _--=> preempt-depth\n" - "# ||| / delay\n" - "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n" - "# | | | |||| | |\n"); + bool tgid = flags & TRACE_ITER_RECORD_TGID; + + seq_printf(m, "# %s _-----=> irqs-off\n", tgid ? " " : ""); + seq_printf(m, "# %s / _----=> need-resched\n", tgid ? " " : ""); + seq_printf(m, "# %s| / _---=> hardirq/softirq\n", tgid ? " " : ""); + seq_printf(m, "# %s|| / _--=> preempt-depth\n", tgid ? " " : ""); + seq_printf(m, "# %s||| / delay\n", tgid ? " " : ""); + seq_printf(m, "# TASK-PID CPU#%s|||| TIMESTAMP FUNCTION\n", tgid ? " TGID " : ""); + seq_printf(m, "# | | | %s|||| | |\n", tgid ? " | " : ""); } void @@ -3580,9 +3657,11 @@ void trace_default_header(struct seq_file *m) } else { if (!(trace_flags & TRACE_ITER_VERBOSE)) { if (trace_flags & TRACE_ITER_IRQ_INFO) - print_func_help_header_irq(iter->trace_buffer, m); + print_func_help_header_irq(iter->trace_buffer, + m, trace_flags); else - print_func_help_header(iter->trace_buffer, m); + print_func_help_header(iter->trace_buffer, m, + trace_flags); } } } @@ -4238,6 +4317,18 @@ int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) if (mask == TRACE_ITER_RECORD_CMD) trace_event_enable_cmd_record(enabled); + if (mask == TRACE_ITER_RECORD_TGID) { + if (!tgid_map) + tgid_map = kzalloc((PID_MAX_DEFAULT + 1) * sizeof(*tgid_map), + GFP_KERNEL); + if (!tgid_map) { + tr->trace_flags &= ~TRACE_ITER_RECORD_TGID; + return -ENOMEM; + } + + trace_event_enable_tgid_record(enabled); + } + if (mask == TRACE_ITER_EVENT_FORK) trace_event_follow_fork(tr, enabled); @@ -4473,7 +4564,8 @@ static const char readme_msg[] = #endif #if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS) "\t accepts: event-definitions (one definition per line)\n" - "\t Format: p|r[:[<group>/]<event>] <place> [<args>]\n" + "\t Format: p[:[<group>/]<event>] <place> [<args>]\n" + "\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n" "\t -:[<group>/]<event>\n" #ifdef CONFIG_KPROBE_EVENTS "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" @@ -4746,11 +4838,11 @@ static const struct file_operations tracing_saved_cmdlines_size_fops = { .write = tracing_saved_cmdlines_size_write, }; -#ifdef CONFIG_TRACE_ENUM_MAP_FILE -static union trace_enum_map_item * -update_enum_map(union trace_enum_map_item *ptr) +#ifdef CONFIG_TRACE_EVAL_MAP_FILE +static union trace_eval_map_item * +update_eval_map(union trace_eval_map_item *ptr) { - if (!ptr->map.enum_string) { + if (!ptr->map.eval_string) { if (ptr->tail.next) { ptr = ptr->tail.next; /* Set ptr to the next real item (skip head) */ @@ -4761,15 +4853,15 @@ update_enum_map(union trace_enum_map_item *ptr) return ptr; } -static void *enum_map_next(struct seq_file *m, void *v, loff_t *pos) +static void *eval_map_next(struct seq_file *m, void *v, loff_t *pos) { - union trace_enum_map_item *ptr = v; + union trace_eval_map_item *ptr = v; /* * Paranoid! If ptr points to end, we don't want to increment past it. * This really should never happen. */ - ptr = update_enum_map(ptr); + ptr = update_eval_map(ptr); if (WARN_ON_ONCE(!ptr)) return NULL; @@ -4777,104 +4869,104 @@ static void *enum_map_next(struct seq_file *m, void *v, loff_t *pos) (*pos)++; - ptr = update_enum_map(ptr); + ptr = update_eval_map(ptr); return ptr; } -static void *enum_map_start(struct seq_file *m, loff_t *pos) +static void *eval_map_start(struct seq_file *m, loff_t *pos) { - union trace_enum_map_item *v; + union trace_eval_map_item *v; loff_t l = 0; - mutex_lock(&trace_enum_mutex); + mutex_lock(&trace_eval_mutex); - v = trace_enum_maps; + v = trace_eval_maps; if (v) v++; while (v && l < *pos) { - v = enum_map_next(m, v, &l); + v = eval_map_next(m, v, &l); } return v; } -static void enum_map_stop(struct seq_file *m, void *v) +static void eval_map_stop(struct seq_file *m, void *v) { - mutex_unlock(&trace_enum_mutex); + mutex_unlock(&trace_eval_mutex); } -static int enum_map_show(struct seq_file *m, void *v) +static int eval_map_show(struct seq_file *m, void *v) { - union trace_enum_map_item *ptr = v; + union trace_eval_map_item *ptr = v; seq_printf(m, "%s %ld (%s)\n", - ptr->map.enum_string, ptr->map.enum_value, + ptr->map.eval_string, ptr->map.eval_value, ptr->map.system); return 0; } -static const struct seq_operations tracing_enum_map_seq_ops = { - .start = enum_map_start, - .next = enum_map_next, - .stop = enum_map_stop, - .show = enum_map_show, +static const struct seq_operations tracing_eval_map_seq_ops = { + .start = eval_map_start, + .next = eval_map_next, + .stop = eval_map_stop, + .show = eval_map_show, }; -static int tracing_enum_map_open(struct inode *inode, struct file *filp) +static int tracing_eval_map_open(struct inode *inode, struct file *filp) { if (tracing_disabled) return -ENODEV; - return seq_open(filp, &tracing_enum_map_seq_ops); + return seq_open(filp, &tracing_eval_map_seq_ops); } -static const struct file_operations tracing_enum_map_fops = { - .open = tracing_enum_map_open, +static const struct file_operations tracing_eval_map_fops = { + .open = tracing_eval_map_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; -static inline union trace_enum_map_item * -trace_enum_jmp_to_tail(union trace_enum_map_item *ptr) +static inline union trace_eval_map_item * +trace_eval_jmp_to_tail(union trace_eval_map_item *ptr) { /* Return tail of array given the head */ return ptr + ptr->head.length + 1; } static void -trace_insert_enum_map_file(struct module *mod, struct trace_enum_map **start, +trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start, int len) { - struct trace_enum_map **stop; - struct trace_enum_map **map; - union trace_enum_map_item *map_array; - union trace_enum_map_item *ptr; + struct trace_eval_map **stop; + struct trace_eval_map **map; + union trace_eval_map_item *map_array; + union trace_eval_map_item *ptr; stop = start + len; /* - * The trace_enum_maps contains the map plus a head and tail item, + * The trace_eval_maps contains the map plus a head and tail item, * where the head holds the module and length of array, and the * tail holds a pointer to the next list. */ map_array = kmalloc(sizeof(*map_array) * (len + 2), GFP_KERNEL); if (!map_array) { - pr_warn("Unable to allocate trace enum mapping\n"); + pr_warn("Unable to allocate trace eval mapping\n"); return; } - mutex_lock(&trace_enum_mutex); + mutex_lock(&trace_eval_mutex); - if (!trace_enum_maps) - trace_enum_maps = map_array; + if (!trace_eval_maps) + trace_eval_maps = map_array; else { - ptr = trace_enum_maps; + ptr = trace_eval_maps; for (;;) { - ptr = trace_enum_jmp_to_tail(ptr); + ptr = trace_eval_jmp_to_tail(ptr); if (!ptr->tail.next) break; ptr = ptr->tail.next; @@ -4892,34 +4984,34 @@ trace_insert_enum_map_file(struct module *mod, struct trace_enum_map **start, } memset(map_array, 0, sizeof(*map_array)); - mutex_unlock(&trace_enum_mutex); + mutex_unlock(&trace_eval_mutex); } -static void trace_create_enum_file(struct dentry *d_tracer) +static void trace_create_eval_file(struct dentry *d_tracer) { - trace_create_file("enum_map", 0444, d_tracer, - NULL, &tracing_enum_map_fops); + trace_create_file("eval_map", 0444, d_tracer, + NULL, &tracing_eval_map_fops); } -#else /* CONFIG_TRACE_ENUM_MAP_FILE */ -static inline void trace_create_enum_file(struct dentry *d_tracer) { } -static inline void trace_insert_enum_map_file(struct module *mod, - struct trace_enum_map **start, int len) { } -#endif /* !CONFIG_TRACE_ENUM_MAP_FILE */ +#else /* CONFIG_TRACE_EVAL_MAP_FILE */ +static inline void trace_create_eval_file(struct dentry *d_tracer) { } +static inline void trace_insert_eval_map_file(struct module *mod, + struct trace_eval_map **start, int len) { } +#endif /* !CONFIG_TRACE_EVAL_MAP_FILE */ -static void trace_insert_enum_map(struct module *mod, - struct trace_enum_map **start, int len) +static void trace_insert_eval_map(struct module *mod, + struct trace_eval_map **start, int len) { - struct trace_enum_map **map; + struct trace_eval_map **map; if (len <= 0) return; map = start; - trace_event_enum_update(map, len); + trace_event_eval_update(map, len); - trace_insert_enum_map_file(mod, start, len); + trace_insert_eval_map_file(mod, start, len); } static ssize_t @@ -6739,33 +6831,18 @@ static const struct file_operations tracing_stats_fops = { #ifdef CONFIG_DYNAMIC_FTRACE -int __weak ftrace_arch_read_dyn_info(char *buf, int size) -{ - return 0; -} - static ssize_t tracing_read_dyn_info(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) { - static char ftrace_dyn_info_buffer[1024]; - static DEFINE_MUTEX(dyn_info_mutex); unsigned long *p = filp->private_data; - char *buf = ftrace_dyn_info_buffer; - int size = ARRAY_SIZE(ftrace_dyn_info_buffer); + char buf[64]; /* Not too big for a shallow stack */ int r; - mutex_lock(&dyn_info_mutex); - r = sprintf(buf, "%ld ", *p); - - r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); + r = scnprintf(buf, 63, "%ld", *p); buf[r++] = '\n'; - r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); - - mutex_unlock(&dyn_info_mutex); - - return r; + return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); } static const struct file_operations tracing_dyn_info_fops = { @@ -6881,6 +6958,9 @@ ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash, char *number; int ret; + if (!tr) + return -ENODEV; + /* hash funcs only work with set_ftrace_filter */ if (!enable) return -EINVAL; @@ -7734,21 +7814,21 @@ struct dentry *tracing_init_dentry(void) return NULL; } -extern struct trace_enum_map *__start_ftrace_enum_maps[]; -extern struct trace_enum_map *__stop_ftrace_enum_maps[]; +extern struct trace_eval_map *__start_ftrace_eval_maps[]; +extern struct trace_eval_map *__stop_ftrace_eval_maps[]; -static void __init trace_enum_init(void) +static void __init trace_eval_init(void) { int len; - len = __stop_ftrace_enum_maps - __start_ftrace_enum_maps; - trace_insert_enum_map(NULL, __start_ftrace_enum_maps, len); + len = __stop_ftrace_eval_maps - __start_ftrace_eval_maps; + trace_insert_eval_map(NULL, __start_ftrace_eval_maps, len); } #ifdef CONFIG_MODULES -static void trace_module_add_enums(struct module *mod) +static void trace_module_add_evals(struct module *mod) { - if (!mod->num_trace_enums) + if (!mod->num_trace_evals) return; /* @@ -7758,40 +7838,40 @@ static void trace_module_add_enums(struct module *mod) if (trace_module_has_bad_taint(mod)) return; - trace_insert_enum_map(mod, mod->trace_enums, mod->num_trace_enums); + trace_insert_eval_map(mod, mod->trace_evals, mod->num_trace_evals); } -#ifdef CONFIG_TRACE_ENUM_MAP_FILE -static void trace_module_remove_enums(struct module *mod) +#ifdef CONFIG_TRACE_EVAL_MAP_FILE +static void trace_module_remove_evals(struct module *mod) { - union trace_enum_map_item *map; - union trace_enum_map_item **last = &trace_enum_maps; + union trace_eval_map_item *map; + union trace_eval_map_item **last = &trace_eval_maps; - if (!mod->num_trace_enums) + if (!mod->num_trace_evals) return; - mutex_lock(&trace_enum_mutex); + mutex_lock(&trace_eval_mutex); - map = trace_enum_maps; + map = trace_eval_maps; while (map) { if (map->head.mod == mod) break; - map = trace_enum_jmp_to_tail(map); + map = trace_eval_jmp_to_tail(map); last = &map->tail.next; map = map->tail.next; } if (!map) goto out; - *last = trace_enum_jmp_to_tail(map)->tail.next; + *last = trace_eval_jmp_to_tail(map)->tail.next; kfree(map); out: - mutex_unlock(&trace_enum_mutex); + mutex_unlock(&trace_eval_mutex); } #else -static inline void trace_module_remove_enums(struct module *mod) { } -#endif /* CONFIG_TRACE_ENUM_MAP_FILE */ +static inline void trace_module_remove_evals(struct module *mod) { } +#endif /* CONFIG_TRACE_EVAL_MAP_FILE */ static int trace_module_notify(struct notifier_block *self, unsigned long val, void *data) @@ -7800,10 +7880,10 @@ static int trace_module_notify(struct notifier_block *self, switch (val) { case MODULE_STATE_COMING: - trace_module_add_enums(mod); + trace_module_add_evals(mod); break; case MODULE_STATE_GOING: - trace_module_remove_enums(mod); + trace_module_remove_evals(mod); break; } @@ -7841,9 +7921,9 @@ static __init int tracer_init_tracefs(void) trace_create_file("saved_cmdlines_size", 0644, d_tracer, NULL, &tracing_saved_cmdlines_size_fops); - trace_enum_init(); + trace_eval_init(); - trace_create_enum_file(d_tracer); + trace_create_eval_file(d_tracer); #ifdef CONFIG_MODULES register_module_notifier(&trace_module_nb); |