mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
![Steven Rostedt (Google)](/assets/img/avatar_default.png)
The hex, raw and bin formats come from the old PREEMPT_RT patch set latency tracer. That actually gave real alternatives to reading the ascii buffer. But they have started to bit rot and they do not give a good representation of the tracing data. Add "fields" option that will read the trace event fields and parse the data from how the fields are defined: With "fields" = 0 (default) echo 1 > events/sched/sched_switch/enable cat trace <idle>-0 [003] d..2. 540.078653: sched_switch: prev_comm=swapper/3 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=kworker/3:1 next_pid=83 next_prio=120 kworker/3:1-83 [003] d..2. 540.078860: sched_switch: prev_comm=kworker/3:1 prev_pid=83 prev_prio=120 prev_state=I ==> next_comm=swapper/3 next_pid=0 next_prio=120 <idle>-0 [003] d..2. 540.206423: sched_switch: prev_comm=swapper/3 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=sshd next_pid=807 next_prio=120 sshd-807 [003] d..2. 540.206531: sched_switch: prev_comm=sshd prev_pid=807 prev_prio=120 prev_state=S ==> next_comm=swapper/3 next_pid=0 next_prio=120 <idle>-0 [001] d..2. 540.206597: sched_switch: prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=kworker/u16:4 next_pid=58 next_prio=120 kworker/u16:4-58 [001] d..2. 540.206617: sched_switch: prev_comm=kworker/u16:4 prev_pid=58 prev_prio=120 prev_state=I ==> next_comm=bash next_pid=830 next_prio=120 bash-830 [001] d..2. 540.206678: sched_switch: prev_comm=bash prev_pid=830 prev_prio=120 prev_state=R ==> next_comm=kworker/u16:4 next_pid=58 next_prio=120 kworker/u16:4-58 [001] d..2. 540.206696: sched_switch: prev_comm=kworker/u16:4 prev_pid=58 prev_prio=120 prev_state=I ==> next_comm=bash next_pid=830 next_prio=120 bash-830 [001] d..2. 540.206713: sched_switch: prev_comm=bash prev_pid=830 prev_prio=120 prev_state=R ==> next_comm=kworker/u16:4 next_pid=58 next_prio=120 echo 1 > options/fields <...>-998 [002] d..2. 538.643732: sched_switch: next_prio=0x78 (120) next_pid=0x0 (0) next_comm=swapper/2 prev_state=0x20 (32) prev_prio=0x78 (120) prev_pid=0x3e6 (998) prev_comm=trace-cmd <idle>-0 [001] d..2. 538.643806: sched_switch: next_prio=0x78 (120) next_pid=0x33e (830) next_comm=bash prev_state=0x0 (0) prev_prio=0x78 (120) prev_pid=0x0 (0) prev_comm=swapper/1 bash-830 [001] d..2. 538.644106: sched_switch: next_prio=0x78 (120) next_pid=0x3a (58) next_comm=kworker/u16:4 prev_state=0x0 (0) prev_prio=0x78 (120) prev_pid=0x33e (830) prev_comm=bash kworker/u16:4-58 [001] d..2. 538.644130: sched_switch: next_prio=0x78 (120) next_pid=0x33e (830) next_comm=bash prev_state=0x80 (128) prev_prio=0x78 (120) prev_pid=0x3a (58) prev_comm=kworker/u16:4 bash-830 [001] d..2. 538.644180: sched_switch: next_prio=0x78 (120) next_pid=0x3a (58) next_comm=kworker/u16:4 prev_state=0x0 (0) prev_prio=0x78 (120) prev_pid=0x33e (830) prev_comm=bash kworker/u16:4-58 [001] d..2. 538.644185: sched_switch: next_prio=0x78 (120) next_pid=0x33e (830) next_comm=bash prev_state=0x80 (128) prev_prio=0x78 (120) prev_pid=0x3a (58) prev_comm=kworker/u16:4 bash-830 [001] d..2. 538.644204: sched_switch: next_prio=0x78 (120) next_pid=0x0 (0) next_comm=swapper/1 prev_state=0x1 (1) prev_prio=0x78 (120) prev_pid=0x33e (830) prev_comm=bash <idle>-0 [003] d..2. 538.644211: sched_switch: next_prio=0x78 (120) next_pid=0x327 (807) next_comm=sshd prev_state=0x0 (0) prev_prio=0x78 (120) prev_pid=0x0 (0) prev_comm=swapper/3 sshd-807 [003] d..2. 538.644340: sched_switch: next_prio=0x78 (120) next_pid=0x0 (0) next_comm=swapper/3 prev_state=0x1 (1) prev_prio=0x78 (120) prev_pid=0x327 (807) prev_comm=sshd It traces the data safely without using the trace print formatting. Link: https://lore.kernel.org/linux-trace-kernel/20230328145156.497651be@gandalf.local.home Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#ifndef __TRACE_EVENTS_H
|
|
#define __TRACE_EVENTS_H
|
|
|
|
#include <linux/trace_seq.h>
|
|
#include "trace.h"
|
|
|
|
extern enum print_line_t
|
|
trace_print_bputs_msg_only(struct trace_iterator *iter);
|
|
extern enum print_line_t
|
|
trace_print_bprintk_msg_only(struct trace_iterator *iter);
|
|
extern enum print_line_t
|
|
trace_print_printk_msg_only(struct trace_iterator *iter);
|
|
|
|
extern int
|
|
seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
|
|
unsigned long sym_flags);
|
|
|
|
extern void trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset);
|
|
extern int trace_print_context(struct trace_iterator *iter);
|
|
extern int trace_print_lat_context(struct trace_iterator *iter);
|
|
extern enum print_line_t print_event_fields(struct trace_iterator *iter,
|
|
struct trace_event *event);
|
|
|
|
extern void trace_event_read_lock(void);
|
|
extern void trace_event_read_unlock(void);
|
|
extern struct trace_event *ftrace_find_event(int type);
|
|
|
|
extern enum print_line_t trace_nop_print(struct trace_iterator *iter,
|
|
int flags, struct trace_event *event);
|
|
extern int
|
|
trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry);
|
|
|
|
/* used by module unregistering */
|
|
extern int __unregister_trace_event(struct trace_event *event);
|
|
extern struct rw_semaphore trace_event_sem;
|
|
|
|
#define SEQ_PUT_FIELD(s, x) \
|
|
trace_seq_putmem(s, &(x), sizeof(x))
|
|
|
|
#define SEQ_PUT_HEX_FIELD(s, x) \
|
|
trace_seq_putmem_hex(s, &(x), sizeof(x))
|
|
|
|
#endif
|
|
|