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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - tools/perf/util/trace-event-read.c
2 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License (not later!)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <sys/types.h>
37 #include "trace-event.h"
42 static ssize_t trace_data_size
;
45 static int __do_read(int fd
, void *buf
, int size
)
50 int ret
= read(fd
, buf
, size
);
56 int retw
= write(STDOUT_FILENO
, buf
, ret
);
58 if (retw
<= 0 || retw
!= ret
) {
59 pr_debug("repiping input file");
71 static int do_read(void *data
, int size
)
75 r
= __do_read(input_fd
, data
, size
);
77 pr_debug("reading input file (size expected=%d received=%d)",
87 /* If it fails, the next read will report it */
88 static void skip(int size
)
94 r
= size
> BUFSIZ
? BUFSIZ
: size
;
100 static unsigned int read4(struct pevent
*pevent
)
104 if (do_read(&data
, 4) < 0)
106 return __data2host4(pevent
, data
);
109 static unsigned long long read8(struct pevent
*pevent
)
111 unsigned long long data
;
113 if (do_read(&data
, 8) < 0)
115 return __data2host8(pevent
, data
);
118 static char *read_string(void)
127 r
= read(input_fd
, &c
, 1);
129 pr_debug("reading input file");
139 int retw
= write(STDOUT_FILENO
, &c
, 1);
141 if (retw
<= 0 || retw
!= r
) {
142 pr_debug("repiping input file string");
153 trace_data_size
+= size
;
157 memcpy(str
, buf
, size
);
162 static int read_proc_kallsyms(struct pevent
*pevent
)
166 size
= read4(pevent
);
170 * Just skip it, now that we configure libtraceevent to use the
171 * tools/perf/ symbol resolver.
173 * We need to skip it so that we can continue parsing old perf.data
174 * files, that contains this /proc/kallsyms payload.
176 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
177 * payload", so that older tools can continue reading it and interpret
178 * it as "no kallsyms payload is present".
180 lseek(input_fd
, size
, SEEK_CUR
);
181 trace_data_size
+= size
;
185 static int read_ftrace_printk(struct pevent
*pevent
)
190 /* it can have 0 size */
191 size
= read4(pevent
);
195 buf
= malloc(size
+ 1);
199 if (do_read(buf
, size
) < 0) {
206 parse_ftrace_printk(pevent
, buf
, size
);
212 static int read_header_files(struct pevent
*pevent
)
214 unsigned long long size
;
219 if (do_read(buf
, 12) < 0)
222 if (memcmp(buf
, "header_page", 12) != 0) {
223 pr_debug("did not read header page");
227 size
= read8(pevent
);
229 header_page
= malloc(size
);
230 if (header_page
== NULL
)
233 if (do_read(header_page
, size
) < 0) {
234 pr_debug("did not read header page");
239 if (!pevent_parse_header_page(pevent
, header_page
, size
,
240 pevent_get_long_size(pevent
))) {
242 * The commit field in the page is of type long,
243 * use that instead, since it represents the kernel.
245 pevent_set_long_size(pevent
, pevent
->header_page_size_size
);
249 if (do_read(buf
, 13) < 0)
252 if (memcmp(buf
, "header_event", 13) != 0) {
253 pr_debug("did not read header event");
257 size
= read8(pevent
);
263 static int read_ftrace_file(struct pevent
*pevent
, unsigned long long size
)
270 pr_debug("memory allocation failure\n");
274 ret
= do_read(buf
, size
);
276 pr_debug("error reading ftrace file.\n");
280 ret
= parse_ftrace_file(pevent
, buf
, size
);
282 pr_debug("error parsing ftrace file.\n");
288 static int read_event_file(struct pevent
*pevent
, char *sys
,
289 unsigned long long size
)
296 pr_debug("memory allocation failure\n");
300 ret
= do_read(buf
, size
);
306 ret
= parse_event_file(pevent
, buf
, size
, sys
);
308 pr_debug("error parsing event file.\n");
314 static int read_ftrace_files(struct pevent
*pevent
)
316 unsigned long long size
;
321 count
= read4(pevent
);
323 for (i
= 0; i
< count
; i
++) {
324 size
= read8(pevent
);
325 ret
= read_ftrace_file(pevent
, size
);
332 static int read_event_files(struct pevent
*pevent
)
334 unsigned long long size
;
341 systems
= read4(pevent
);
343 for (i
= 0; i
< systems
; i
++) {
348 count
= read4(pevent
);
350 for (x
=0; x
< count
; x
++) {
351 size
= read8(pevent
);
352 ret
= read_event_file(pevent
, sys
, size
);
360 static int read_saved_cmdline(struct pevent
*pevent
)
362 unsigned long long size
;
366 /* it can have 0 size */
367 size
= read8(pevent
);
371 buf
= malloc(size
+ 1);
373 pr_debug("memory allocation failure\n");
377 ret
= do_read(buf
, size
);
379 pr_debug("error reading saved cmdlines\n");
383 parse_saved_cmdline(pevent
, buf
, size
);
390 ssize_t
trace_report(int fd
, struct trace_event
*tevent
, bool __repipe
)
393 char test
[] = { 23, 8, 68 };
395 int show_version
= 0;
403 struct pevent
*pevent
= NULL
;
409 if (do_read(buf
, 3) < 0)
411 if (memcmp(buf
, test
, 3) != 0) {
412 pr_debug("no trace data in the file");
416 if (do_read(buf
, 7) < 0)
418 if (memcmp(buf
, "tracing", 7) != 0) {
419 pr_debug("not a trace file (missing 'tracing' tag)");
423 version
= read_string();
427 printf("version = %s\n", version
);
429 if (do_read(buf
, 1) < 0) {
433 file_bigendian
= buf
[0];
434 host_bigendian
= bigendian();
436 if (trace_event__init(tevent
)) {
437 pr_debug("trace_event__init failed");
441 pevent
= tevent
->pevent
;
443 pevent_set_flag(pevent
, PEVENT_NSEC_OUTPUT
);
444 pevent_set_file_bigendian(pevent
, file_bigendian
);
445 pevent_set_host_bigendian(pevent
, host_bigendian
);
447 if (do_read(buf
, 1) < 0)
449 file_long_size
= buf
[0];
451 file_page_size
= read4(pevent
);
455 pevent_set_long_size(pevent
, file_long_size
);
456 pevent_set_page_size(pevent
, file_page_size
);
458 err
= read_header_files(pevent
);
461 err
= read_ftrace_files(pevent
);
464 err
= read_event_files(pevent
);
467 err
= read_proc_kallsyms(pevent
);
470 err
= read_ftrace_printk(pevent
);
473 if (atof(version
) >= 0.6) {
474 err
= read_saved_cmdline(pevent
);
479 size
= trace_data_size
;
483 pevent_print_funcs(pevent
);
484 } else if (show_printk
) {
485 pevent_print_printk(pevent
);
492 trace_event__cleanup(tevent
);