perf tools: Add trace event debugfs stream reader
Add util/trace-event-read.c which handles trace events
informations reading.
This file is a rename of the trace-read.c file from the
trace-cmd tools, written by Steven Rostedt and Josh Triplett,
originated from the git tree:
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git
This is its perf tools integration.
[ fweisbec@gmail.com: various changes for perf tools
integration. ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: "Luis Claudio R. Goncalves" <lclaudio@uudg.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Jon Masters <jonathan@jonmasters.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Zhaolei <zhaolei@cn.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Anton Blanchard <anton@samba.org>
LKML-Reference: <1250518688-7207-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
Ingo Molnar
parent
5205094364
commit
538bafb5cc
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@ -0,0 +1,508 @@
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/*
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* Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License (not later!)
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#define _LARGEFILE64_SOURCE
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#include <dirent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <pthread.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <errno.h>
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#include "util.h"
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#include "trace-event.h"
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static int input_fd;
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static int read_page;
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int file_bigendian;
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int host_bigendian;
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static int long_size;
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static unsigned long page_size;
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static int read_or_die(void *data, int size)
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{
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int r;
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r = read(input_fd, data, size);
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if (r != size)
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die("reading input file (size expected=%d received=%d)",
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size, r);
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return r;
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}
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static unsigned int read4(void)
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{
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unsigned int data;
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read_or_die(&data, 4);
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return __data2host4(data);
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}
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static unsigned long long read8(void)
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{
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unsigned long long data;
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read_or_die(&data, 8);
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return __data2host8(data);
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}
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static char *read_string(void)
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{
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char buf[BUFSIZ];
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char *str = NULL;
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int size = 0;
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int i;
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int r;
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for (;;) {
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r = read(input_fd, buf, BUFSIZ);
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if (r < 0)
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die("reading input file");
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if (!r)
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die("no data");
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for (i = 0; i < r; i++) {
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if (!buf[i])
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break;
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}
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if (i < r)
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break;
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if (str) {
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size += BUFSIZ;
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str = realloc(str, size);
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if (!str)
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die("malloc of size %d", size);
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memcpy(str + (size - BUFSIZ), buf, BUFSIZ);
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} else {
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size = BUFSIZ;
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str = malloc_or_die(size);
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memcpy(str, buf, size);
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}
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}
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/* move the file descriptor to the end of the string */
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r = lseek(input_fd, -(r - (i+1)), SEEK_CUR);
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if (r < 0)
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die("lseek");
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if (str) {
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size += i;
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str = realloc(str, size);
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if (!str)
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die("malloc of size %d", size);
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memcpy(str + (size - i), buf, i);
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} else {
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size = i;
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str = malloc_or_die(i);
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memcpy(str, buf, i);
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}
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return str;
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}
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static void read_proc_kallsyms(void)
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{
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unsigned int size;
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char *buf;
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size = read4();
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if (!size)
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return;
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buf = malloc_or_die(size);
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read_or_die(buf, size);
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parse_proc_kallsyms(buf, size);
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free(buf);
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}
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static void read_ftrace_printk(void)
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{
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unsigned int size;
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char *buf;
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size = read4();
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if (!size)
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return;
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buf = malloc_or_die(size);
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read_or_die(buf, size);
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parse_ftrace_printk(buf, size);
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free(buf);
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}
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static void read_header_files(void)
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{
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unsigned long long size;
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char *header_page;
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char *header_event;
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char buf[BUFSIZ];
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read_or_die(buf, 12);
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if (memcmp(buf, "header_page", 12) != 0)
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die("did not read header page");
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size = read8();
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header_page = malloc_or_die(size);
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read_or_die(header_page, size);
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parse_header_page(header_page, size);
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free(header_page);
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/*
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* The size field in the page is of type long,
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* use that instead, since it represents the kernel.
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*/
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long_size = header_page_size_size;
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read_or_die(buf, 13);
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if (memcmp(buf, "header_event", 13) != 0)
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die("did not read header event");
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size = read8();
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header_event = malloc_or_die(size);
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read_or_die(header_event, size);
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free(header_event);
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}
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static void read_ftrace_file(unsigned long long size)
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{
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char *buf;
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buf = malloc_or_die(size);
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read_or_die(buf, size);
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parse_ftrace_file(buf, size);
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free(buf);
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}
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static void read_event_file(char *sys, unsigned long long size)
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{
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char *buf;
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buf = malloc_or_die(size);
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read_or_die(buf, size);
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parse_event_file(buf, size, sys);
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free(buf);
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}
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static void read_ftrace_files(void)
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{
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unsigned long long size;
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int count;
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int i;
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count = read4();
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for (i = 0; i < count; i++) {
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size = read8();
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read_ftrace_file(size);
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}
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}
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static void read_event_files(void)
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{
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unsigned long long size;
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char *sys;
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int systems;
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int count;
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int i,x;
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systems = read4();
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for (i = 0; i < systems; i++) {
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sys = read_string();
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count = read4();
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for (x=0; x < count; x++) {
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size = read8();
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read_event_file(sys, size);
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}
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}
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}
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struct cpu_data {
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unsigned long long offset;
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unsigned long long size;
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unsigned long long timestamp;
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struct record *next;
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char *page;
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int cpu;
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int index;
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int page_size;
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};
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static struct cpu_data *cpu_data;
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static void update_cpu_data_index(int cpu)
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{
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cpu_data[cpu].offset += page_size;
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cpu_data[cpu].size -= page_size;
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cpu_data[cpu].index = 0;
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}
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static void get_next_page(int cpu)
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{
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off64_t save_seek;
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off64_t ret;
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if (!cpu_data[cpu].page)
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return;
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if (read_page) {
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if (cpu_data[cpu].size <= page_size) {
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free(cpu_data[cpu].page);
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cpu_data[cpu].page = NULL;
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return;
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}
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update_cpu_data_index(cpu);
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/* other parts of the code may expect the pointer to not move */
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save_seek = lseek64(input_fd, 0, SEEK_CUR);
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ret = lseek64(input_fd, cpu_data[cpu].offset, SEEK_SET);
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if (ret < 0)
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die("failed to lseek");
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ret = read(input_fd, cpu_data[cpu].page, page_size);
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if (ret < 0)
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die("failed to read page");
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/* reset the file pointer back */
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lseek64(input_fd, save_seek, SEEK_SET);
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return;
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}
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munmap(cpu_data[cpu].page, page_size);
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cpu_data[cpu].page = NULL;
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if (cpu_data[cpu].size <= page_size)
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return;
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update_cpu_data_index(cpu);
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cpu_data[cpu].page = mmap(NULL, page_size, PROT_READ, MAP_PRIVATE,
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input_fd, cpu_data[cpu].offset);
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if (cpu_data[cpu].page == MAP_FAILED)
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die("failed to mmap cpu %d at offset 0x%llx",
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cpu, cpu_data[cpu].offset);
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}
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static unsigned int type_len4host(unsigned int type_len_ts)
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{
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if (file_bigendian)
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return (type_len_ts >> 27) & ((1 << 5) - 1);
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else
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return type_len_ts & ((1 << 5) - 1);
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}
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static unsigned int ts4host(unsigned int type_len_ts)
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{
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if (file_bigendian)
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return type_len_ts & ((1 << 27) - 1);
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else
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return type_len_ts >> 5;
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}
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static int calc_index(void *ptr, int cpu)
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{
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return (unsigned long)ptr - (unsigned long)cpu_data[cpu].page;
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}
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struct record *trace_peek_data(int cpu)
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{
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struct record *data;
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void *page = cpu_data[cpu].page;
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int idx = cpu_data[cpu].index;
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void *ptr = page + idx;
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unsigned long long extend;
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unsigned int type_len_ts;
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unsigned int type_len;
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unsigned int delta;
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unsigned int length = 0;
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if (cpu_data[cpu].next)
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return cpu_data[cpu].next;
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if (!page)
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return NULL;
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if (!idx) {
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/* FIXME: handle header page */
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if (header_page_ts_size != 8)
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die("expected a long long type for timestamp");
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cpu_data[cpu].timestamp = data2host8(ptr);
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ptr += 8;
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switch (header_page_size_size) {
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case 4:
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cpu_data[cpu].page_size = data2host4(ptr);
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ptr += 4;
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break;
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case 8:
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cpu_data[cpu].page_size = data2host8(ptr);
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ptr += 8;
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break;
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default:
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die("bad long size");
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}
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ptr = cpu_data[cpu].page + header_page_data_offset;
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}
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read_again:
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idx = calc_index(ptr, cpu);
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if (idx >= cpu_data[cpu].page_size) {
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get_next_page(cpu);
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return trace_peek_data(cpu);
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}
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type_len_ts = data2host4(ptr);
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ptr += 4;
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type_len = type_len4host(type_len_ts);
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delta = ts4host(type_len_ts);
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switch (type_len) {
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case RINGBUF_TYPE_PADDING:
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if (!delta)
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die("error, hit unexpected end of page");
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length = data2host4(ptr);
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ptr += 4;
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length *= 4;
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ptr += length;
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goto read_again;
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case RINGBUF_TYPE_TIME_EXTEND:
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extend = data2host4(ptr);
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ptr += 4;
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extend <<= TS_SHIFT;
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extend += delta;
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cpu_data[cpu].timestamp += extend;
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goto read_again;
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case RINGBUF_TYPE_TIME_STAMP:
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ptr += 12;
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break;
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case 0:
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length = data2host4(ptr);
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ptr += 4;
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die("here! length=%d", length);
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break;
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default:
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length = type_len * 4;
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break;
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}
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cpu_data[cpu].timestamp += delta;
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data = malloc_or_die(sizeof(*data));
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memset(data, 0, sizeof(*data));
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data->ts = cpu_data[cpu].timestamp;
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data->size = length;
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data->data = ptr;
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ptr += length;
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cpu_data[cpu].index = calc_index(ptr, cpu);
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cpu_data[cpu].next = data;
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return data;
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}
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struct record *trace_read_data(int cpu)
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{
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struct record *data;
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data = trace_peek_data(cpu);
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cpu_data[cpu].next = NULL;
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return data;
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}
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void trace_report (void)
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{
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const char *input_file = "trace.info";
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char buf[BUFSIZ];
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char test[] = { 23, 8, 68 };
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char *version;
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int show_funcs = 0;
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int show_printk = 0;
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input_fd = open(input_file, O_RDONLY);
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if (input_fd < 0)
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die("opening '%s'\n", input_file);
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read_or_die(buf, 3);
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if (memcmp(buf, test, 3) != 0)
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die("not an trace data file");
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read_or_die(buf, 7);
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if (memcmp(buf, "tracing", 7) != 0)
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die("not a trace file (missing tracing)");
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version = read_string();
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printf("version = %s\n", version);
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free(version);
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read_or_die(buf, 1);
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file_bigendian = buf[0];
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host_bigendian = bigendian();
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read_or_die(buf, 1);
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long_size = buf[0];
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page_size = read4();
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read_header_files();
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read_ftrace_files();
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read_event_files();
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read_proc_kallsyms();
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read_ftrace_printk();
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if (show_funcs) {
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print_funcs();
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return;
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}
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if (show_printk) {
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print_printk();
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return;
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}
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return;
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}
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