From f633cef0200bbaec539e2dbb0bc4bed7f022f98b Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Tue, 23 Dec 2008 23:24:13 -0500 Subject: ftrace: change trace.c to use registered events Impact: rework trace.c to use new event register API Almost every ftrace event has to implement its output display in trace.c through a different function. Some events did not handle all the formats (trace, latency-trace, raw, hex, binary), and this method does not scale well. This patch converts the format functions to use the event API to find the event and and print its format. Currently, we have a print function for trace, latency_trace, raw, hex and binary. A trace_nop_print is available if the event wants to avoid output on a particular format. Perhaps other tracers could use this in the future (like mmiotrace and function_graph). Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- kernel/trace/trace_output.c | 467 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 467 insertions(+) (limited to 'kernel/trace/trace_output.c') diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 1f3f80002b5..df0c25cbed3 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -286,6 +286,15 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) return ret; } +static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; + +static int task_state_char(unsigned long state) +{ + int bit = state ? __ffs(state) + 1 : 0; + + return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; +} + /** * ftrace_find_event - find a registered event * @type: the type of event to look for @@ -363,3 +372,461 @@ int unregister_ftrace_event(struct trace_event *event) return 0; } + +/* + * Standard events + */ + +int +trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return 0; +} + +/* TRACE_FN */ +static int +trace_fn_latency(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct ftrace_entry *field; + + trace_assign_type(field, entry); + + if (!seq_print_ip_sym(s, field->ip, flags)) + goto partial; + if (!trace_seq_puts(s, " (")) + goto partial; + if (!seq_print_ip_sym(s, field->parent_ip, flags)) + goto partial; + if (!trace_seq_puts(s, ")\n")) + goto partial; + + return 0; + + partial: + return TRACE_TYPE_PARTIAL_LINE; +} + +static int +trace_fn_trace(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct ftrace_entry *field; + + trace_assign_type(field, entry); + + if (!seq_print_ip_sym(s, field->ip, flags)) + goto partial; + + if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { + if (!trace_seq_printf(s, " <-")) + goto partial; + if (!seq_print_ip_sym(s, + field->parent_ip, + flags)) + goto partial; + } + if (!trace_seq_printf(s, "\n")) + goto partial; + + return 0; + + partial: + return TRACE_TYPE_PARTIAL_LINE; +} + +static int +trace_fn_raw(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct ftrace_entry *field; + + trace_assign_type(field, entry); + + if (trace_seq_printf(s, "%x %x\n", + field->ip, + field->parent_ip)) + return TRACE_TYPE_PARTIAL_LINE; + + return 0; +} + +static int +trace_fn_hex(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct ftrace_entry *field; + + trace_assign_type(field, entry); + + SEQ_PUT_HEX_FIELD_RET(s, field->ip); + SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); + + return 0; +} + +static int +trace_fn_bin(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct ftrace_entry *field; + + trace_assign_type(field, entry); + + SEQ_PUT_FIELD_RET(s, field->ip); + SEQ_PUT_FIELD_RET(s, field->parent_ip); + + return 0; +} + +static struct trace_event trace_fn_event = { + .type = TRACE_FN, + .trace = trace_fn_trace, + .latency_trace = trace_fn_latency, + .raw = trace_fn_raw, + .hex = trace_fn_hex, + .binary = trace_fn_bin, +}; + +/* TRACE_CTX an TRACE_WAKE */ +static int +trace_ctxwake_print(struct trace_seq *s, struct trace_entry *entry, int flags, + char *delim) +{ + struct ctx_switch_entry *field; + char *comm; + int S, T; + + trace_assign_type(field, entry); + + T = task_state_char(field->next_state); + S = task_state_char(field->prev_state); + comm = trace_find_cmdline(field->next_pid); + if (trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", + field->prev_pid, + field->prev_prio, + S, delim, + field->next_cpu, + field->next_pid, + field->next_prio, + T, comm)) + return TRACE_TYPE_PARTIAL_LINE; + + return 0; +} + +static int +trace_ctx_print(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return trace_ctxwake_print(s, entry, flags, "==>"); +} + +static int +trace_wake_print(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return trace_ctxwake_print(s, entry, flags, " +"); +} + +static int +trace_ctxwake_raw(struct trace_seq *s, struct trace_entry *entry, int flags, + char S) +{ + struct ctx_switch_entry *field; + int T; + + trace_assign_type(field, entry); + + if (!S) + task_state_char(field->prev_state); + T = task_state_char(field->next_state); + if (trace_seq_printf(s, "%d %d %c %d %d %d %c\n", + field->prev_pid, + field->prev_prio, + S, + field->next_cpu, + field->next_pid, + field->next_prio, + T)) + return TRACE_TYPE_PARTIAL_LINE; + + return 0; +} + +static int +trace_ctx_raw(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return trace_ctxwake_raw(s, entry, flags, 0); +} + +static int +trace_wake_raw(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return trace_ctxwake_raw(s, entry, flags, '+'); +} + + +static int +trace_ctxwake_hex(struct trace_seq *s, struct trace_entry *entry, int flags, + char S) +{ + struct ctx_switch_entry *field; + int T; + + trace_assign_type(field, entry); + + if (!S) + task_state_char(field->prev_state); + T = task_state_char(field->next_state); + + SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); + SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); + SEQ_PUT_HEX_FIELD_RET(s, S); + SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); + SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); + SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); + SEQ_PUT_HEX_FIELD_RET(s, T); + + return 0; +} + +static int +trace_ctx_hex(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return trace_ctxwake_hex(s, entry, flags, 0); +} + +static int +trace_wake_hex(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + return trace_ctxwake_hex(s, entry, flags, '+'); +} + +static int +trace_ctxwake_bin(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct ctx_switch_entry *field; + + trace_assign_type(field, entry); + + SEQ_PUT_FIELD_RET(s, field->prev_pid); + SEQ_PUT_FIELD_RET(s, field->prev_prio); + SEQ_PUT_FIELD_RET(s, field->prev_state); + SEQ_PUT_FIELD_RET(s, field->next_pid); + SEQ_PUT_FIELD_RET(s, field->next_prio); + SEQ_PUT_FIELD_RET(s, field->next_state); + + return 0; +} + +static struct trace_event trace_ctx_event = { + .type = TRACE_CTX, + .trace = trace_ctx_print, + .latency_trace = trace_ctx_print, + .raw = trace_ctx_raw, + .hex = trace_ctx_hex, + .binary = trace_ctxwake_bin, +}; + +static struct trace_event trace_wake_event = { + .type = TRACE_WAKE, + .trace = trace_wake_print, + .latency_trace = trace_wake_print, + .raw = trace_wake_raw, + .hex = trace_wake_hex, + .binary = trace_ctxwake_bin, +}; + +/* TRACE_SPECIAL */ +static int +trace_special_print(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct special_entry *field; + + trace_assign_type(field, entry); + + if (trace_seq_printf(s, "# %ld %ld %ld\n", + field->arg1, + field->arg2, + field->arg3)) + return TRACE_TYPE_PARTIAL_LINE; + + return 0; +} + +static int +trace_special_hex(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct special_entry *field; + + trace_assign_type(field, entry); + + SEQ_PUT_HEX_FIELD_RET(s, field->arg1); + SEQ_PUT_HEX_FIELD_RET(s, field->arg2); + SEQ_PUT_HEX_FIELD_RET(s, field->arg3); + + return 0; +} + +static int +trace_special_bin(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct special_entry *field; + + trace_assign_type(field, entry); + + SEQ_PUT_FIELD_RET(s, field->arg1); + SEQ_PUT_FIELD_RET(s, field->arg2); + SEQ_PUT_FIELD_RET(s, field->arg3); + + return 0; +} + +static struct trace_event trace_special_event = { + .type = TRACE_SPECIAL, + .trace = trace_special_print, + .latency_trace = trace_special_print, + .raw = trace_special_print, + .hex = trace_special_hex, + .binary = trace_special_bin, +}; + +/* TRACE_STACK */ + +static int +trace_stack_print(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct stack_entry *field; + int i; + + trace_assign_type(field, entry); + + for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { + if (i) { + if (trace_seq_puts(s, " <= ")) + goto partial; + + if (seq_print_ip_sym(s, field->caller[i], flags)) + goto partial; + } + if (trace_seq_puts(s, "\n")) + goto partial; + } + + return 0; + + partial: + return TRACE_TYPE_PARTIAL_LINE; +} + +static struct trace_event trace_stack_event = { + .type = TRACE_STACK, + .trace = trace_stack_print, + .latency_trace = trace_stack_print, + .raw = trace_special_print, + .hex = trace_special_hex, + .binary = trace_special_bin, +}; + +/* TRACE_USER_STACK */ +static int +trace_user_stack_print(struct trace_seq *s, struct trace_entry *entry, + int flags) +{ + struct userstack_entry *field; + + trace_assign_type(field, entry); + + if (seq_print_userip_objs(field, s, flags)) + goto partial; + + if (trace_seq_putc(s, '\n')) + goto partial; + + return 0; + + partial: + return TRACE_TYPE_PARTIAL_LINE; +} + +static struct trace_event trace_user_stack_event = { + .type = TRACE_USER_STACK, + .trace = trace_user_stack_print, + .latency_trace = trace_user_stack_print, + .raw = trace_special_print, + .hex = trace_special_hex, + .binary = trace_special_bin, +}; + +/* TRACE_PRINT */ +static int +trace_print_print(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct print_entry *field; + + trace_assign_type(field, entry); + + if (seq_print_ip_sym(s, field->ip, flags)) + goto partial; + + if (trace_seq_printf(s, ": %s", field->buf)) + goto partial; + + return 0; + + partial: + return TRACE_TYPE_PARTIAL_LINE; +} + +static int +trace_print_raw(struct trace_seq *s, struct trace_entry *entry, int flags) +{ + struct print_entry *field; + + trace_assign_type(field, entry); + + if (seq_print_ip_sym(s, field->ip, flags)) + goto partial; + + if (trace_seq_printf(s, "# %lx %s", field->ip, field->buf)) + goto partial; + + return 0; + + partial: + return TRACE_TYPE_PARTIAL_LINE; +} + +static struct trace_event trace_print_event = { + .type = TRACE_PRINT, + .trace = trace_print_print, + .latency_trace = trace_print_print, + .raw = trace_print_raw, + .hex = trace_nop_print, + .binary = trace_nop_print, +}; + +static struct trace_event *events[] __initdata = { + &trace_fn_event, + &trace_ctx_event, + &trace_wake_event, + &trace_special_event, + &trace_stack_event, + &trace_user_stack_event, + &trace_print_event, + NULL +}; + +__init static int init_events(void) +{ + struct trace_event *event; + int i, ret; + + for (i = 0; events[i]; i++) { + event = events[i]; + + ret = register_ftrace_event(event); + if (!ret) { + printk(KERN_WARNING "event %d failed to register\n", + event->type); + WARN_ON_ONCE(1); + } + } + + return 0; +} +device_initcall(init_events); 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