f633cef020
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 <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
833 lines
17 KiB
C
833 lines
17 KiB
C
/*
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* trace_output.c
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*
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* Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/ftrace.h>
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#include "trace_output.h"
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/* must be a power of 2 */
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#define EVENT_HASHSIZE 128
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static DEFINE_MUTEX(trace_event_mutex);
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static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
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static int next_event_type = __TRACE_LAST_TYPE + 1;
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/**
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* trace_seq_printf - sequence printing of trace information
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* @s: trace sequence descriptor
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* @fmt: printf format string
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*
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* The tracer may use either sequence operations or its own
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* copy to user routines. To simplify formating of a trace
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* trace_seq_printf is used to store strings into a special
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* buffer (@s). Then the output may be either used by
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* the sequencer or pulled into another buffer.
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*/
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int
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trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
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{
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int len = (PAGE_SIZE - 1) - s->len;
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va_list ap;
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int ret;
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if (!len)
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return 0;
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va_start(ap, fmt);
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ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
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va_end(ap);
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/* If we can't write it all, don't bother writing anything */
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if (ret >= len)
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return 0;
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s->len += ret;
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return len;
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}
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/**
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* trace_seq_puts - trace sequence printing of simple string
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* @s: trace sequence descriptor
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* @str: simple string to record
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*
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* The tracer may use either the sequence operations or its own
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* copy to user routines. This function records a simple string
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* into a special buffer (@s) for later retrieval by a sequencer
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* or other mechanism.
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*/
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int trace_seq_puts(struct trace_seq *s, const char *str)
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{
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int len = strlen(str);
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if (len > ((PAGE_SIZE - 1) - s->len))
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return 0;
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memcpy(s->buffer + s->len, str, len);
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s->len += len;
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return len;
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}
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int trace_seq_putc(struct trace_seq *s, unsigned char c)
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{
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if (s->len >= (PAGE_SIZE - 1))
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return 0;
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s->buffer[s->len++] = c;
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return 1;
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}
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int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
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{
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if (len > ((PAGE_SIZE - 1) - s->len))
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return 0;
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memcpy(s->buffer + s->len, mem, len);
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s->len += len;
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return len;
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}
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int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
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{
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unsigned char hex[HEX_CHARS];
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unsigned char *data = mem;
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int i, j;
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#ifdef __BIG_ENDIAN
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for (i = 0, j = 0; i < len; i++) {
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#else
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for (i = len-1, j = 0; i >= 0; i--) {
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#endif
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hex[j++] = hex_asc_hi(data[i]);
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hex[j++] = hex_asc_lo(data[i]);
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}
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hex[j++] = ' ';
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return trace_seq_putmem(s, hex, j);
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}
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int trace_seq_path(struct trace_seq *s, struct path *path)
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{
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unsigned char *p;
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if (s->len >= (PAGE_SIZE - 1))
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return 0;
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p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
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if (!IS_ERR(p)) {
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p = mangle_path(s->buffer + s->len, p, "\n");
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if (p) {
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s->len = p - s->buffer;
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return 1;
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}
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} else {
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s->buffer[s->len++] = '?';
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return 1;
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}
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return 0;
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}
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#ifdef CONFIG_KRETPROBES
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static inline const char *kretprobed(const char *name)
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{
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static const char tramp_name[] = "kretprobe_trampoline";
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int size = sizeof(tramp_name);
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if (strncmp(tramp_name, name, size) == 0)
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return "[unknown/kretprobe'd]";
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return name;
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}
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#else
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static inline const char *kretprobed(const char *name)
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{
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return name;
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}
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#endif /* CONFIG_KRETPROBES */
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static int
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seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
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{
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#ifdef CONFIG_KALLSYMS
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char str[KSYM_SYMBOL_LEN];
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const char *name;
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kallsyms_lookup(address, NULL, NULL, NULL, str);
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name = kretprobed(str);
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return trace_seq_printf(s, fmt, name);
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#endif
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return 1;
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}
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static int
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seq_print_sym_offset(struct trace_seq *s, const char *fmt,
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unsigned long address)
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{
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#ifdef CONFIG_KALLSYMS
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char str[KSYM_SYMBOL_LEN];
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const char *name;
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sprint_symbol(str, address);
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name = kretprobed(str);
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return trace_seq_printf(s, fmt, name);
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#endif
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return 1;
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}
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#ifndef CONFIG_64BIT
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# define IP_FMT "%08lx"
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#else
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# define IP_FMT "%016lx"
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#endif
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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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{
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struct file *file = NULL;
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unsigned long vmstart = 0;
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int ret = 1;
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if (mm) {
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const struct vm_area_struct *vma;
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down_read(&mm->mmap_sem);
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vma = find_vma(mm, ip);
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if (vma) {
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file = vma->vm_file;
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vmstart = vma->vm_start;
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}
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if (file) {
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ret = trace_seq_path(s, &file->f_path);
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if (ret)
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ret = trace_seq_printf(s, "[+0x%lx]",
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ip - vmstart);
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}
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up_read(&mm->mmap_sem);
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}
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if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
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ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
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return ret;
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}
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int
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seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
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unsigned long sym_flags)
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{
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struct mm_struct *mm = NULL;
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int ret = 1;
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unsigned int i;
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if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
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struct task_struct *task;
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/*
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* we do the lookup on the thread group leader,
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* since individual threads might have already quit!
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*/
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rcu_read_lock();
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task = find_task_by_vpid(entry->ent.tgid);
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if (task)
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mm = get_task_mm(task);
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rcu_read_unlock();
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}
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for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
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unsigned long ip = entry->caller[i];
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if (ip == ULONG_MAX || !ret)
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break;
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if (i && ret)
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ret = trace_seq_puts(s, " <- ");
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if (!ip) {
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if (ret)
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ret = trace_seq_puts(s, "??");
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continue;
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}
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if (!ret)
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break;
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if (ret)
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ret = seq_print_user_ip(s, mm, ip, sym_flags);
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}
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if (mm)
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mmput(mm);
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return ret;
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}
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int
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seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
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{
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int ret;
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if (!ip)
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return trace_seq_printf(s, "0");
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if (sym_flags & TRACE_ITER_SYM_OFFSET)
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ret = seq_print_sym_offset(s, "%s", ip);
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else
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ret = seq_print_sym_short(s, "%s", ip);
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if (!ret)
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return 0;
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if (sym_flags & TRACE_ITER_SYM_ADDR)
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ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
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return ret;
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}
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static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
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static int task_state_char(unsigned long state)
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{
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int bit = state ? __ffs(state) + 1 : 0;
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return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
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}
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/**
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* ftrace_find_event - find a registered event
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* @type: the type of event to look for
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*
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* Returns an event of type @type otherwise NULL
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*/
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struct trace_event *ftrace_find_event(int type)
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{
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struct trace_event *event;
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struct hlist_node *n;
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unsigned key;
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key = type & (EVENT_HASHSIZE - 1);
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hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
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if (event->type == type)
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return event;
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}
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return NULL;
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}
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/**
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* register_ftrace_event - register output for an event type
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* @event: the event type to register
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*
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* Event types are stored in a hash and this hash is used to
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* find a way to print an event. If the @event->type is set
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* then it will use that type, otherwise it will assign a
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* type to use.
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*
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* If you assign your own type, please make sure it is added
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* to the trace_type enum in trace.h, to avoid collisions
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* with the dynamic types.
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*
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* Returns the event type number or zero on error.
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*/
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int register_ftrace_event(struct trace_event *event)
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{
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unsigned key;
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int ret = 0;
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mutex_lock(&trace_event_mutex);
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if (!event->type)
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event->type = next_event_type++;
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else if (event->type > __TRACE_LAST_TYPE) {
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printk(KERN_WARNING "Need to add type to trace.h\n");
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WARN_ON(1);
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}
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if (ftrace_find_event(event->type))
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goto out;
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key = event->type & (EVENT_HASHSIZE - 1);
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hlist_add_head_rcu(&event->node, &event_hash[key]);
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ret = event->type;
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out:
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mutex_unlock(&trace_event_mutex);
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return ret;
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}
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/**
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* unregister_ftrace_event - remove a no longer used event
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* @event: the event to remove
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*/
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int unregister_ftrace_event(struct trace_event *event)
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{
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mutex_lock(&trace_event_mutex);
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hlist_del(&event->node);
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mutex_unlock(&trace_event_mutex);
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return 0;
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}
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/*
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* Standard events
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*/
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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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{
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return 0;
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}
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/* TRACE_FN */
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static int
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trace_fn_latency(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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struct ftrace_entry *field;
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trace_assign_type(field, entry);
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if (!seq_print_ip_sym(s, field->ip, flags))
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goto partial;
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if (!trace_seq_puts(s, " ("))
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goto partial;
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if (!seq_print_ip_sym(s, field->parent_ip, flags))
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goto partial;
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if (!trace_seq_puts(s, ")\n"))
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goto partial;
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return 0;
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partial:
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return TRACE_TYPE_PARTIAL_LINE;
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}
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static int
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trace_fn_trace(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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struct ftrace_entry *field;
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trace_assign_type(field, entry);
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if (!seq_print_ip_sym(s, field->ip, flags))
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goto partial;
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if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
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if (!trace_seq_printf(s, " <-"))
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goto partial;
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if (!seq_print_ip_sym(s,
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field->parent_ip,
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flags))
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goto partial;
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}
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if (!trace_seq_printf(s, "\n"))
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goto partial;
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return 0;
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partial:
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return TRACE_TYPE_PARTIAL_LINE;
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}
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static int
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trace_fn_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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struct ftrace_entry *field;
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trace_assign_type(field, entry);
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if (trace_seq_printf(s, "%x %x\n",
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field->ip,
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field->parent_ip))
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return TRACE_TYPE_PARTIAL_LINE;
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return 0;
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}
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static int
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trace_fn_hex(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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struct ftrace_entry *field;
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trace_assign_type(field, entry);
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SEQ_PUT_HEX_FIELD_RET(s, field->ip);
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SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
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return 0;
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}
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static int
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trace_fn_bin(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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struct ftrace_entry *field;
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trace_assign_type(field, entry);
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SEQ_PUT_FIELD_RET(s, field->ip);
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SEQ_PUT_FIELD_RET(s, field->parent_ip);
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return 0;
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}
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static struct trace_event trace_fn_event = {
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.type = TRACE_FN,
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.trace = trace_fn_trace,
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.latency_trace = trace_fn_latency,
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.raw = trace_fn_raw,
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.hex = trace_fn_hex,
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.binary = trace_fn_bin,
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};
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/* TRACE_CTX an TRACE_WAKE */
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static int
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trace_ctxwake_print(struct trace_seq *s, struct trace_entry *entry, int flags,
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char *delim)
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{
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struct ctx_switch_entry *field;
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char *comm;
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int S, T;
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trace_assign_type(field, entry);
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T = task_state_char(field->next_state);
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S = task_state_char(field->prev_state);
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comm = trace_find_cmdline(field->next_pid);
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if (trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
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field->prev_pid,
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field->prev_prio,
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S, delim,
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field->next_cpu,
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field->next_pid,
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field->next_prio,
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T, comm))
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return TRACE_TYPE_PARTIAL_LINE;
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return 0;
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}
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static int
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trace_ctx_print(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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return trace_ctxwake_print(s, entry, flags, "==>");
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}
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static int
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trace_wake_print(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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return trace_ctxwake_print(s, entry, flags, " +");
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}
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static int
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trace_ctxwake_raw(struct trace_seq *s, struct trace_entry *entry, int flags,
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char S)
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{
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struct ctx_switch_entry *field;
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int T;
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trace_assign_type(field, entry);
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if (!S)
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task_state_char(field->prev_state);
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T = task_state_char(field->next_state);
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if (trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
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field->prev_pid,
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field->prev_prio,
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S,
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field->next_cpu,
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field->next_pid,
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field->next_prio,
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T))
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return TRACE_TYPE_PARTIAL_LINE;
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return 0;
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}
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static int
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trace_ctx_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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return trace_ctxwake_raw(s, entry, flags, 0);
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}
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static int
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trace_wake_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
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{
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return trace_ctxwake_raw(s, entry, flags, '+');
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}
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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);
|