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c4a8e8be2d
Impact: make trace_event more convenient for tracers
All tracers (for the moment) that use the struct trace_event want to
have the context info printed before their own output: the pid/cmdline,
cpu, and timestamp.
But some other tracers that want to implement their trace_event
callbacks will not necessary need these information or they may want to
format them as they want.
This patch adds a new default-enabled trace option:
TRACE_ITER_CONTEXT_INFO When disabled through:
echo nocontext-info > /debugfs/tracing/trace_options
The pid, cpu and timestamps headers will not be printed.
IE with the sched_switch tracer with context-info (default):
bash-2935 [001] 100.356561: 2935:120:S ==> [001] 0:140:R <idle>
<idle>-0 [000] 100.412804: 0:140:R + [000] 11:115:S events/0
<idle>-0 [000] 100.412816: 0:140:R ==> [000] 11:115:R events/0
events/0-11 [000] 100.412829: 11:115:S ==> [000] 0:140:R <idle>
Without context-info:
2935:120:S ==> [001] 0:140:R <idle>
0:140:R + [000] 11:115:S events/0
0:140:R ==> [000] 11:115:R events/0
11:115:S ==> [000] 0:140:R <idle>
A tracer can disable it at runtime by clearing the bit
TRACE_ITER_CONTEXT_INFO in trace_flags.
The print routines were renamed to trace_print_context and
trace_print_lat_context, so that they can be used by tracers if they
want to use them for one of the trace_event callbacks.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
#ifndef __TRACE_EVENTS_H
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#define __TRACE_EVENTS_H
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#include "trace.h"
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typedef int (*trace_print_func)(struct trace_seq *s, struct trace_entry *entry,
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int flags);
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struct trace_event {
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struct hlist_node node;
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int type;
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trace_print_func trace;
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trace_print_func latency_trace;
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trace_print_func raw;
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trace_print_func hex;
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trace_print_func binary;
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};
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extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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extern int
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seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
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unsigned long sym_flags);
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extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
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size_t cnt);
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int trace_seq_puts(struct trace_seq *s, const char *str);
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int trace_seq_putc(struct trace_seq *s, unsigned char c);
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int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len);
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int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len);
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int trace_seq_path(struct trace_seq *s, struct path *path);
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int seq_print_userip_objs(const struct userstack_entry *entry,
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struct trace_seq *s, unsigned long sym_flags);
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int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
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unsigned long ip, unsigned long sym_flags);
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int trace_print_context(struct trace_iterator *iter);
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int trace_print_lat_context(struct trace_iterator *iter);
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struct trace_event *ftrace_find_event(int type);
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int register_ftrace_event(struct trace_event *event);
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int unregister_ftrace_event(struct trace_event *event);
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int
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trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags);
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#define MAX_MEMHEX_BYTES 8
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#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
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#define SEQ_PUT_FIELD_RET(s, x) \
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do { \
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if (!trace_seq_putmem(s, &(x), sizeof(x))) \
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return TRACE_TYPE_PARTIAL_LINE; \
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} while (0)
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#define SEQ_PUT_HEX_FIELD_RET(s, x) \
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do { \
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BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
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if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
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return TRACE_TYPE_PARTIAL_LINE; \
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} while (0)
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#endif
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