Merge branch 'perfcounters/tracing' into perfcounters/core

Merge reason: this topic is ready now to merge into the main
              development branch for .32, with functional
              perf trace output.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/Makefile

@@ -347,6 +347,9 @@ LIB_OBJS += util/values.o
 LIB_OBJS += util/debug.o
 LIB_OBJS += util/map.o
 LIB_OBJS += util/thread.o
+LIB_OBJS += util/trace-event-parse.o
+LIB_OBJS += util/trace-event-read.o
+LIB_OBJS += util/trace-event-info.o
 
 BUILTIN_OBJS += builtin-annotate.o
 BUILTIN_OBJS += builtin-help.o
@@ -355,6 +358,7 @@ BUILTIN_OBJS += builtin-record.o
 BUILTIN_OBJS += builtin-report.o
 BUILTIN_OBJS += builtin-stat.o
 BUILTIN_OBJS += builtin-top.o
+BUILTIN_OBJS += builtin-trace.o
 
 PERFLIBS = $(LIB_FILE)
 

tools/perf/builtin-record.c

@@ -17,6 +17,7 @@
 #include "util/header.h"
 #include "util/event.h"
 #include "util/debug.h"
+#include "util/trace-event.h"
 
 #include <unistd.h>
 #include <sched.h>
@@ -546,6 +547,17 @@ static int __cmd_record(int argc, const char **argv)
 	else
 		header = perf_header__new();
 
+
+	if (raw_samples) {
+		read_tracing_data(attrs, nr_counters);
+	} else {
+		for (i = 0; i < nr_counters; i++) {
+			if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
+				read_tracing_data(attrs, nr_counters);
+				break;
+			}
+		}
+	}
 	atexit(atexit_header);
 
 	if (!system_wide) {

tools/perf/builtin-report.c

@@ -1428,7 +1428,7 @@ static int __cmd_report(void)
 			exit(-1);
 		}
 		if (callchain) {
-			fprintf(stderr, "selected -c but no callchain data."
+			fprintf(stderr, "selected -g but no callchain data."
 					" Did you call perf record without"
 					" -g?\n");
 			exit(-1);

tools/perf/builtin-trace.c

@@ -0,0 +1,282 @@
+#include "builtin.h"
+
+#include "util/util.h"
+#include "util/cache.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+#include "util/header.h"
+
+#include "util/parse-options.h"
+
+#include "perf.h"
+#include "util/debug.h"
+
+#include "util/trace-event.h"
+
+static char		const *input_name = "perf.data";
+static int		input;
+static unsigned long	page_size;
+static unsigned long	mmap_window = 32;
+
+static unsigned long	total = 0;
+static unsigned long	total_comm = 0;
+
+static struct rb_root	threads;
+static struct thread	*last_match;
+
+static struct perf_header *header;
+static u64		sample_type;
+
+
+static int
+process_comm_event(event_t *event, unsigned long offset, unsigned long head)
+{
+	struct thread *thread;
+
+	thread = threads__findnew(event->comm.pid, &threads, &last_match);
+
+	dump_printf("%p [%p]: PERF_EVENT_COMM: %s:%d\n",
+		(void *)(offset + head),
+		(void *)(long)(event->header.size),
+		event->comm.comm, event->comm.pid);
+
+	if (thread == NULL ||
+	    thread__set_comm(thread, event->comm.comm)) {
+		dump_printf("problem processing PERF_EVENT_COMM, skipping event.\n");
+		return -1;
+	}
+	total_comm++;
+
+	return 0;
+}
+
+static int
+process_sample_event(event_t *event, unsigned long offset, unsigned long head)
+{
+	char level;
+	int show = 0;
+	struct dso *dso = NULL;
+	struct thread *thread;
+	u64 ip = event->ip.ip;
+	u64 period = 1;
+	void *more_data = event->ip.__more_data;
+	int cpumode;
+
+	thread = threads__findnew(event->ip.pid, &threads, &last_match);
+
+	if (sample_type & PERF_SAMPLE_PERIOD) {
+		period = *(u64 *)more_data;
+		more_data += sizeof(u64);
+	}
+
+	dump_printf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
+		(void *)(offset + head),
+		(void *)(long)(event->header.size),
+		event->header.misc,
+		event->ip.pid, event->ip.tid,
+		(void *)(long)ip,
+		(long long)period);
+
+	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
+
+	if (thread == NULL) {
+		eprintf("problem processing %d event, skipping it.\n",
+			event->header.type);
+		return -1;
+	}
+
+	cpumode = event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK;
+
+	if (cpumode == PERF_EVENT_MISC_KERNEL) {
+		show = SHOW_KERNEL;
+		level = 'k';
+
+		dso = kernel_dso;
+
+		dump_printf(" ...... dso: %s\n", dso->name);
+
+	} else if (cpumode == PERF_EVENT_MISC_USER) {
+
+		show = SHOW_USER;
+		level = '.';
+
+	} else {
+		show = SHOW_HV;
+		level = 'H';
+
+		dso = hypervisor_dso;
+
+		dump_printf(" ...... dso: [hypervisor]\n");
+	}
+
+	if (sample_type & PERF_SAMPLE_RAW) {
+		struct {
+			u32 size;
+			char data[0];
+		} *raw = more_data;
+
+		/*
+		 * FIXME: better resolve from pid from the struct trace_entry
+		 * field, although it should be the same than this perf
+		 * event pid
+		 */
+		print_event(0, raw->data, raw->size, 0, thread->comm);
+	}
+	total += period;
+
+	return 0;
+}
+
+static int
+process_event(event_t *event, unsigned long offset, unsigned long head)
+{
+	trace_event(event);
+
+	switch (event->header.type) {
+	case PERF_EVENT_MMAP ... PERF_EVENT_LOST:
+		return 0;
+
+	case PERF_EVENT_COMM:
+		return process_comm_event(event, offset, head);
+
+	case PERF_EVENT_EXIT ... PERF_EVENT_READ:
+		return 0;
+
+	case PERF_EVENT_SAMPLE:
+		return process_sample_event(event, offset, head);
+
+	case PERF_EVENT_MAX:
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+static int __cmd_trace(void)
+{
+	int ret, rc = EXIT_FAILURE;
+	unsigned long offset = 0;
+	unsigned long head = 0;
+	struct stat perf_stat;
+	event_t *event;
+	uint32_t size;
+	char *buf;
+
+	trace_report();
+
+	input = open(input_name, O_RDONLY);
+	if (input < 0) {
+		perror("failed to open file");
+		exit(-1);
+	}
+
+	ret = fstat(input, &perf_stat);
+	if (ret < 0) {
+		perror("failed to stat file");
+		exit(-1);
+	}
+
+	if (!perf_stat.st_size) {
+		fprintf(stderr, "zero-sized file, nothing to do!\n");
+		exit(0);
+	}
+	header = perf_header__read(input);
+	sample_type = perf_header__sample_type(header);
+
+	if (!(sample_type & PERF_SAMPLE_RAW))
+		die("No trace sample to read. Did you call perf record "
+		    "without -R?");
+
+	if (load_kernel() < 0) {
+		perror("failed to load kernel symbols");
+		return EXIT_FAILURE;
+	}
+
+remap:
+	buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
+			   MAP_SHARED, input, offset);
+	if (buf == MAP_FAILED) {
+		perror("failed to mmap file");
+		exit(-1);
+	}
+
+more:
+	event = (event_t *)(buf + head);
+
+	size = event->header.size;
+	if (!size)
+		size = 8;
+
+	if (head + event->header.size >= page_size * mmap_window) {
+		unsigned long shift = page_size * (head / page_size);
+		int res;
+
+		res = munmap(buf, page_size * mmap_window);
+		assert(res == 0);
+
+		offset += shift;
+		head -= shift;
+		goto remap;
+	}
+
+	size = event->header.size;
+
+
+	if (!size || process_event(event, offset, head) < 0) {
+
+		/*
+		 * assume we lost track of the stream, check alignment, and
+		 * increment a single u64 in the hope to catch on again 'soon'.
+		 */
+
+		if (unlikely(head & 7))
+			head &= ~7ULL;
+
+		size = 8;
+	}
+
+	head += size;
+
+	if (offset + head < (unsigned long)perf_stat.st_size)
+		goto more;
+
+	rc = EXIT_SUCCESS;
+	close(input);
+
+	return rc;
+}
+
+static const char * const annotate_usage[] = {
+	"perf trace [<options>] <command>",
+	NULL
+};
+
+static const struct option options[] = {
+	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
+		    "dump raw trace in ASCII"),
+	OPT_BOOLEAN('v', "verbose", &verbose,
+		    "be more verbose (show symbol address, etc)"),
+	OPT_END()
+};
+
+int cmd_trace(int argc, const char **argv, const char *prefix __used)
+{
+	symbol__init();
+	page_size = getpagesize();
+
+	argc = parse_options(argc, argv, options, annotate_usage, 0);
+	if (argc) {
+		/*
+		 * Special case: if there's an argument left then assume tha
+		 * it's a symbol filter:
+		 */
+		if (argc > 1)
+			usage_with_options(annotate_usage, options);
+	}
+
+
+	setup_pager();
+
+	return __cmd_trace();
+}

tools/perf/perf.c

@@ -292,6 +292,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "top", cmd_top, 0 },
 		{ "annotate", cmd_annotate, 0 },
 		{ "version", cmd_version, 0 },
+		{ "trace", cmd_trace, 0 },
 	};
 	unsigned int i;
 	static const char ext[] = STRIP_EXTENSION;

tools/perf/util/parse-events.c

@@ -158,9 +158,9 @@ int valid_debugfs_mount(const char *debugfs)
 	return 0;
 }
 
-static const char *tracepoint_id_to_name(u64 config)
+struct tracepoint_path *tracepoint_id_to_path(u64 config)
 {
-	static char tracepoint_name[2 * MAX_EVENT_LENGTH];
+	struct tracepoint_path *path = NULL;
 	DIR *sys_dir, *evt_dir;
 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 	struct stat st;
@@ -170,7 +170,7 @@ static const char *tracepoint_id_to_name(u64 config)
 	char evt_path[MAXPATHLEN];
 
 	if (valid_debugfs_mount(debugfs_path))
-		return "unkown";
+		return NULL;
 
 	sys_dir = opendir(debugfs_path);
 	if (!sys_dir)
@@ -197,10 +197,23 @@ static const char *tracepoint_id_to_name(u64 config)
 			if (id == config) {
 				closedir(evt_dir);
 				closedir(sys_dir);
-				snprintf(tracepoint_name, 2 * MAX_EVENT_LENGTH,
+				path = calloc(1, sizeof(path));
-					"%s:%s", sys_dirent.d_name,
+				path->system = malloc(MAX_EVENT_LENGTH);
-					evt_dirent.d_name);
+				if (!path->system) {
-				return tracepoint_name;
+					free(path);
+					return NULL;
+				}
+				path->name = malloc(MAX_EVENT_LENGTH);
+				if (!path->name) {
+					free(path->system);
+					free(path);
+					return NULL;
+				}
+				strncpy(path->system, sys_dirent.d_name,
+					MAX_EVENT_LENGTH);
+				strncpy(path->name, evt_dirent.d_name,
+					MAX_EVENT_LENGTH);
+				return path;
 			}
 		}
 		closedir(evt_dir);
@@ -208,7 +221,25 @@ static const char *tracepoint_id_to_name(u64 config)
 
 cleanup:
 	closedir(sys_dir);
-	return "unkown";
+	return NULL;
+}
+
+#define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
+static const char *tracepoint_id_to_name(u64 config)
+{
+	static char buf[TP_PATH_LEN];
+	struct tracepoint_path *path;
+
+	path = tracepoint_id_to_path(config);
+	if (path) {
+		snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
+		free(path->name);
+		free(path->system);
+		free(path);
+	} else
+		snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
+
+	return buf;
 }
 
 static int is_cache_op_valid(u8 cache_type, u8 cache_op)

tools/perf/util/parse-events.h

@@ -1,10 +1,19 @@
-
+#ifndef _PARSE_EVENTS_H
+#define _PARSE_EVENTS_H
 /*
  * Parse symbolic events/counts passed in as options:
  */
 
 struct option;
 
+struct tracepoint_path {
+	char *system;
+	char *name;
+	struct tracepoint_path *next;
+};
+
+extern struct tracepoint_path *tracepoint_id_to_path(u64 config);
+
 extern int			nr_counters;
 
 extern struct perf_counter_attr attrs[MAX_COUNTERS];
@@ -21,3 +30,5 @@ extern void print_events(void);
 extern char debugfs_path[];
 extern int valid_debugfs_mount(const char *debugfs);
 
+
+#endif /* _PARSE_EVENTS_H */

tools/perf/util/trace-event-info.c

@@ -0,0 +1,539 @@
+/*
+ * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#define _GNU_SOURCE
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <pthread.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include "../perf.h"
+#include "trace-event.h"
+
+
+#define VERSION "0.5"
+
+#define _STR(x) #x
+#define STR(x) _STR(x)
+#define MAX_PATH 256
+
+#define TRACE_CTRL	"tracing_on"
+#define TRACE		"trace"
+#define AVAILABLE	"available_tracers"
+#define CURRENT		"current_tracer"
+#define ITER_CTRL	"trace_options"
+#define MAX_LATENCY	"tracing_max_latency"
+
+unsigned int page_size;
+
+static const char *output_file = "trace.info";
+static int output_fd;
+
+struct event_list {
+	struct event_list *next;
+	const char *event;
+};
+
+struct events {
+	struct events *sibling;
+	struct events *children;
+	struct events *next;
+	char *name;
+};
+
+
+
+static void die(const char *fmt, ...)
+{
+	va_list ap;
+	int ret = errno;
+
+	if (errno)
+		perror("trace-cmd");
+	else
+		ret = -1;
+
+	va_start(ap, fmt);
+	fprintf(stderr, "  ");
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "\n");
+	exit(ret);
+}
+
+void *malloc_or_die(unsigned int size)
+{
+	void *data;
+
+	data = malloc(size);
+	if (!data)
+		die("malloc");
+	return data;
+}
+
+static const char *find_debugfs(void)
+{
+	static char debugfs[MAX_PATH+1];
+	static int debugfs_found;
+	char type[100];
+	FILE *fp;
+
+	if (debugfs_found)
+		return debugfs;
+
+	if ((fp = fopen("/proc/mounts","r")) == NULL)
+		die("Can't open /proc/mounts for read");
+
+	while (fscanf(fp, "%*s %"
+		      STR(MAX_PATH)
+		      "s %99s %*s %*d %*d\n",
+		      debugfs, type) == 2) {
+		if (strcmp(type, "debugfs") == 0)
+			break;
+	}
+	fclose(fp);
+
+	if (strcmp(type, "debugfs") != 0)
+		die("debugfs not mounted, please mount");
+
+	debugfs_found = 1;
+
+	return debugfs;
+}
+
+/*
+ * Finds the path to the debugfs/tracing
+ * Allocates the string and stores it.
+ */
+static const char *find_tracing_dir(void)
+{
+	static char *tracing;
+	static int tracing_found;
+	const char *debugfs;
+
+	if (tracing_found)
+		return tracing;
+
+	debugfs = find_debugfs();
+
+	tracing = malloc_or_die(strlen(debugfs) + 9);
+
+	sprintf(tracing, "%s/tracing", debugfs);
+
+	tracing_found = 1;
+	return tracing;
+}
+
+static char *get_tracing_file(const char *name)
+{
+	const char *tracing;
+	char *file;
+
+	tracing = find_tracing_dir();
+	if (!tracing)
+		return NULL;
+
+	file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
+
+	sprintf(file, "%s/%s", tracing, name);
+	return file;
+}
+
+static void put_tracing_file(char *file)
+{
+	free(file);
+}
+
+static ssize_t write_or_die(const void *buf, size_t len)
+{
+	int ret;
+
+	ret = write(output_fd, buf, len);
+	if (ret < 0)
+		die("writing to '%s'", output_file);
+
+	return ret;
+}
+
+int bigendian(void)
+{
+	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
+	unsigned int *ptr;
+
+	ptr = (unsigned int *)str;
+	return *ptr == 0x01020304;
+}
+
+static unsigned long long copy_file_fd(int fd)
+{
+	unsigned long long size = 0;
+	char buf[BUFSIZ];
+	int r;
+
+	do {
+		r = read(fd, buf, BUFSIZ);
+		if (r > 0) {
+			size += r;
+			write_or_die(buf, r);
+		}
+	} while (r > 0);
+
+	return size;
+}
+
+static unsigned long long copy_file(const char *file)
+{
+	unsigned long long size = 0;
+	int fd;
+
+	fd = open(file, O_RDONLY);
+	if (fd < 0)
+		die("Can't read '%s'", file);
+	size = copy_file_fd(fd);
+	close(fd);
+
+	return size;
+}
+
+static unsigned long get_size_fd(int fd)
+{
+	unsigned long long size = 0;
+	char buf[BUFSIZ];
+	int r;
+
+	do {
+		r = read(fd, buf, BUFSIZ);
+		if (r > 0)
+			size += r;
+	} while (r > 0);
+
+	lseek(fd, 0, SEEK_SET);
+
+	return size;
+}
+
+static unsigned long get_size(const char *file)
+{
+	unsigned long long size = 0;
+	int fd;
+
+	fd = open(file, O_RDONLY);
+	if (fd < 0)
+		die("Can't read '%s'", file);
+	size = get_size_fd(fd);
+	close(fd);
+
+	return size;
+}
+
+static void read_header_files(void)
+{
+	unsigned long long size, check_size;
+	char *path;
+	int fd;
+
+	path = get_tracing_file("events/header_page");
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		die("can't read '%s'", path);
+
+	/* unfortunately, you can not stat debugfs files for size */
+	size = get_size_fd(fd);
+
+	write_or_die("header_page", 12);
+	write_or_die(&size, 8);
+	check_size = copy_file_fd(fd);
+	if (size != check_size)
+		die("wrong size for '%s' size=%lld read=%lld",
+		    path, size, check_size);
+	put_tracing_file(path);
+
+	path = get_tracing_file("events/header_event");
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		die("can't read '%s'", path);
+
+	size = get_size_fd(fd);
+
+	write_or_die("header_event", 13);
+	write_or_die(&size, 8);
+	check_size = copy_file_fd(fd);
+	if (size != check_size)
+		die("wrong size for '%s'", path);
+	put_tracing_file(path);
+}
+
+static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
+{
+	while (tps) {
+		if (!strcmp(sys, tps->name))
+			return true;
+		tps = tps->next;
+	}
+
+	return false;
+}
+
+static void copy_event_system(const char *sys, struct tracepoint_path *tps)
+{
+	unsigned long long size, check_size;
+	struct dirent *dent;
+	struct stat st;
+	char *format;
+	DIR *dir;
+	int count = 0;
+	int ret;
+
+	dir = opendir(sys);
+	if (!dir)
+		die("can't read directory '%s'", sys);
+
+	while ((dent = readdir(dir))) {
+		if (strcmp(dent->d_name, ".") == 0 ||
+		    strcmp(dent->d_name, "..") == 0 ||
+		    !name_in_tp_list(dent->d_name, tps))
+			continue;
+		format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
+		sprintf(format, "%s/%s/format", sys, dent->d_name);
+		ret = stat(format, &st);
+		free(format);
+		if (ret < 0)
+			continue;
+		count++;
+	}
+
+	write_or_die(&count, 4);
+
+	rewinddir(dir);
+	while ((dent = readdir(dir))) {
+		if (strcmp(dent->d_name, ".") == 0 ||
+		    strcmp(dent->d_name, "..") == 0 ||
+		    !name_in_tp_list(dent->d_name, tps))
+			continue;
+		format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
+		sprintf(format, "%s/%s/format", sys, dent->d_name);
+		ret = stat(format, &st);
+
+		if (ret >= 0) {
+			/* unfortunately, you can not stat debugfs files for size */
+			size = get_size(format);
+			write_or_die(&size, 8);
+			check_size = copy_file(format);
+			if (size != check_size)
+				die("error in size of file '%s'", format);
+		}
+
+		free(format);
+	}
+}
+
+static void read_ftrace_files(struct tracepoint_path *tps)
+{
+	char *path;
+
+	path = get_tracing_file("events/ftrace");
+
+	copy_event_system(path, tps);
+
+	put_tracing_file(path);
+}
+
+static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
+{
+	while (tps) {
+		if (!strcmp(sys, tps->system))
+			return true;
+		tps = tps->next;
+	}
+
+	return false;
+}
+
+static void read_event_files(struct tracepoint_path *tps)
+{
+	struct dirent *dent;
+	struct stat st;
+	char *path;
+	char *sys;
+	DIR *dir;
+	int count = 0;
+	int ret;
+
+	path = get_tracing_file("events");
+
+	dir = opendir(path);
+	if (!dir)
+		die("can't read directory '%s'", path);
+
+	while ((dent = readdir(dir))) {
+		if (strcmp(dent->d_name, ".") == 0 ||
+		    strcmp(dent->d_name, "..") == 0 ||
+		    strcmp(dent->d_name, "ftrace") == 0 ||
+		    !system_in_tp_list(dent->d_name, tps))
+			continue;
+		sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
+		sprintf(sys, "%s/%s", path, dent->d_name);
+		ret = stat(sys, &st);
+		free(sys);
+		if (ret < 0)
+			continue;
+		if (S_ISDIR(st.st_mode))
+			count++;
+	}
+
+	write_or_die(&count, 4);
+
+	rewinddir(dir);
+	while ((dent = readdir(dir))) {
+		if (strcmp(dent->d_name, ".") == 0 ||
+		    strcmp(dent->d_name, "..") == 0 ||
+		    strcmp(dent->d_name, "ftrace") == 0 ||
+		    !system_in_tp_list(dent->d_name, tps))
+			continue;
+		sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
+		sprintf(sys, "%s/%s", path, dent->d_name);
+		ret = stat(sys, &st);
+		if (ret >= 0) {
+			if (S_ISDIR(st.st_mode)) {
+				write_or_die(dent->d_name, strlen(dent->d_name) + 1);
+				copy_event_system(sys, tps);
+			}
+		}
+		free(sys);
+	}
+
+	put_tracing_file(path);
+}
+
+static void read_proc_kallsyms(void)
+{
+	unsigned int size, check_size;
+	const char *path = "/proc/kallsyms";
+	struct stat st;
+	int ret;
+
+	ret = stat(path, &st);
+	if (ret < 0) {
+		/* not found */
+		size = 0;
+		write_or_die(&size, 4);
+		return;
+	}
+	size = get_size(path);
+	write_or_die(&size, 4);
+	check_size = copy_file(path);
+	if (size != check_size)
+		die("error in size of file '%s'", path);
+
+}
+
+static void read_ftrace_printk(void)
+{
+	unsigned int size, check_size;
+	const char *path;
+	struct stat st;
+	int ret;
+
+	path = get_tracing_file("printk_formats");
+	ret = stat(path, &st);
+	if (ret < 0) {
+		/* not found */
+		size = 0;
+		write_or_die(&size, 4);
+		return;
+	}
+	size = get_size(path);
+	write_or_die(&size, 4);
+	check_size = copy_file(path);
+	if (size != check_size)
+		die("error in size of file '%s'", path);
+
+}
+
+static struct tracepoint_path *
+get_tracepoints_path(struct perf_counter_attr *pattrs, int nb_counters)
+{
+	struct tracepoint_path path, *ppath = &path;
+	int i;
+
+	for (i = 0; i < nb_counters; i++) {
+		if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
+			continue;
+		ppath->next = tracepoint_id_to_path(pattrs[i].config);
+		if (!ppath->next)
+			die("%s\n", "No memory to alloc tracepoints list");
+		ppath = ppath->next;
+	}
+
+	return path.next;
+}
+void read_tracing_data(struct perf_counter_attr *pattrs, int nb_counters)
+{
+	char buf[BUFSIZ];
+	struct tracepoint_path *tps;
+
+	output_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
+	if (output_fd < 0)
+		die("creating file '%s'", output_file);
+
+	buf[0] = 23;
+	buf[1] = 8;
+	buf[2] = 68;
+	memcpy(buf + 3, "tracing", 7);
+
+	write_or_die(buf, 10);
+
+	write_or_die(VERSION, strlen(VERSION) + 1);
+
+	/* save endian */
+	if (bigendian())
+		buf[0] = 1;
+	else
+		buf[0] = 0;
+
+	write_or_die(buf, 1);
+
+	/* save size of long */
+	buf[0] = sizeof(long);
+	write_or_die(buf, 1);
+
+	/* save page_size */
+	page_size = getpagesize();
+	write_or_die(&page_size, 4);
+
+	tps = get_tracepoints_path(pattrs, nb_counters);
+
+	read_header_files();
+	read_ftrace_files(tps);
+	read_event_files(tps);
+	read_proc_kallsyms();
+	read_ftrace_printk();
+}

tools/perf/util/trace-event-read.c

@@ -0,0 +1,509 @@
+/*
+ * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License (not later!)
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#define _LARGEFILE64_SOURCE
+
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
+#include <pthread.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include "../perf.h"
+#include "util.h"
+#include "trace-event.h"
+
+static int input_fd;
+
+static int read_page;
+
+int file_bigendian;
+int host_bigendian;
+static int long_size;
+
+static unsigned long	page_size;
+
+static int read_or_die(void *data, int size)
+{
+	int r;
+
+	r = read(input_fd, data, size);
+	if (r != size)
+		die("reading input file (size expected=%d received=%d)",
+		    size, r);
+	return r;
+}
+
+static unsigned int read4(void)
+{
+	unsigned int data;
+
+	read_or_die(&data, 4);
+	return __data2host4(data);
+}
+
+static unsigned long long read8(void)
+{
+	unsigned long long data;
+
+	read_or_die(&data, 8);
+	return __data2host8(data);
+}
+
+static char *read_string(void)
+{
+	char buf[BUFSIZ];
+	char *str = NULL;
+	int size = 0;
+	int i;
+	int r;
+
+	for (;;) {
+		r = read(input_fd, buf, BUFSIZ);
+		if (r < 0)
+			die("reading input file");
+
+		if (!r)
+			die("no data");
+
+		for (i = 0; i < r; i++) {
+			if (!buf[i])
+				break;
+		}
+		if (i < r)
+			break;
+
+		if (str) {
+			size += BUFSIZ;
+			str = realloc(str, size);
+			if (!str)
+				die("malloc of size %d", size);
+			memcpy(str + (size - BUFSIZ), buf, BUFSIZ);
+		} else {
+			size = BUFSIZ;
+			str = malloc_or_die(size);
+			memcpy(str, buf, size);
+		}
+	}
+
+	/* move the file descriptor to the end of the string */
+	r = lseek(input_fd, -(r - (i+1)), SEEK_CUR);
+	if (r < 0)
+		die("lseek");
+
+	if (str) {
+		size += i;
+		str = realloc(str, size);
+		if (!str)
+			die("malloc of size %d", size);
+		memcpy(str + (size - i), buf, i);
+	} else {
+		size = i;
+		str = malloc_or_die(i);
+		memcpy(str, buf, i);
+	}
+
+	return str;
+}
+
+static void read_proc_kallsyms(void)
+{
+	unsigned int size;
+	char *buf;
+
+	size = read4();
+	if (!size)
+		return;
+
+	buf = malloc_or_die(size);
+	read_or_die(buf, size);
+
+	parse_proc_kallsyms(buf, size);
+
+	free(buf);
+}
+
+static void read_ftrace_printk(void)
+{
+	unsigned int size;
+	char *buf;
+
+	size = read4();
+	if (!size)
+		return;
+
+	buf = malloc_or_die(size);
+	read_or_die(buf, size);
+
+	parse_ftrace_printk(buf, size);
+
+	free(buf);
+}
+
+static void read_header_files(void)
+{
+	unsigned long long size;
+	char *header_page;
+	char *header_event;
+	char buf[BUFSIZ];
+
+	read_or_die(buf, 12);
+
+	if (memcmp(buf, "header_page", 12) != 0)
+		die("did not read header page");
+
+	size = read8();
+	header_page = malloc_or_die(size);
+	read_or_die(header_page, size);
+	parse_header_page(header_page, size);
+	free(header_page);
+
+	/*
+	 * The size field in the page is of type long,
+	 * use that instead, since it represents the kernel.
+	 */
+	long_size = header_page_size_size;
+
+	read_or_die(buf, 13);
+	if (memcmp(buf, "header_event", 13) != 0)
+		die("did not read header event");
+
+	size = read8();
+	header_event = malloc_or_die(size);
+	read_or_die(header_event, size);
+	free(header_event);
+}
+
+static void read_ftrace_file(unsigned long long size)
+{
+	char *buf;
+
+	buf = malloc_or_die(size);
+	read_or_die(buf, size);
+	parse_ftrace_file(buf, size);
+	free(buf);
+}
+
+static void read_event_file(char *sys, unsigned long long size)
+{
+	char *buf;
+
+	buf = malloc_or_die(size);
+	read_or_die(buf, size);
+	parse_event_file(buf, size, sys);
+	free(buf);
+}
+
+static void read_ftrace_files(void)
+{
+	unsigned long long size;
+	int count;
+	int i;
+
+	count = read4();
+
+	for (i = 0; i < count; i++) {
+		size = read8();
+		read_ftrace_file(size);
+	}
+}
+
+static void read_event_files(void)
+{
+	unsigned long long size;
+	char *sys;
+	int systems;
+	int count;
+	int i,x;
+
+	systems = read4();
+
+	for (i = 0; i < systems; i++) {
+		sys = read_string();
+
+		count = read4();
+		for (x=0; x < count; x++) {
+			size = read8();
+			read_event_file(sys, size);
+		}
+	}
+}
+
+struct cpu_data {
+	unsigned long long	offset;
+	unsigned long long	size;
+	unsigned long long	timestamp;
+	struct record		*next;
+	char			*page;
+	int			cpu;
+	int			index;
+	int			page_size;
+};
+
+static struct cpu_data *cpu_data;
+
+static void update_cpu_data_index(int cpu)
+{
+	cpu_data[cpu].offset += page_size;
+	cpu_data[cpu].size -= page_size;
+	cpu_data[cpu].index = 0;
+}
+
+static void get_next_page(int cpu)
+{
+	off64_t save_seek;
+	off64_t ret;
+
+	if (!cpu_data[cpu].page)
+		return;
+
+	if (read_page) {
+		if (cpu_data[cpu].size <= page_size) {
+			free(cpu_data[cpu].page);
+			cpu_data[cpu].page = NULL;
+			return;
+		}
+
+		update_cpu_data_index(cpu);
+
+		/* other parts of the code may expect the pointer to not move */
+		save_seek = lseek64(input_fd, 0, SEEK_CUR);
+
+		ret = lseek64(input_fd, cpu_data[cpu].offset, SEEK_SET);
+		if (ret < 0)
+			die("failed to lseek");
+		ret = read(input_fd, cpu_data[cpu].page, page_size);
+		if (ret < 0)
+			die("failed to read page");
+
+		/* reset the file pointer back */
+		lseek64(input_fd, save_seek, SEEK_SET);
+
+		return;
+	}
+
+	munmap(cpu_data[cpu].page, page_size);
+	cpu_data[cpu].page = NULL;
+
+	if (cpu_data[cpu].size <= page_size)
+		return;
+
+	update_cpu_data_index(cpu);
+
+	cpu_data[cpu].page = mmap(NULL, page_size, PROT_READ, MAP_PRIVATE,
+				  input_fd, cpu_data[cpu].offset);
+	if (cpu_data[cpu].page == MAP_FAILED)
+		die("failed to mmap cpu %d at offset 0x%llx",
+		    cpu, cpu_data[cpu].offset);
+}
+
+static unsigned int type_len4host(unsigned int type_len_ts)
+{
+	if (file_bigendian)
+		return (type_len_ts >> 27) & ((1 << 5) - 1);
+	else
+		return type_len_ts & ((1 << 5) - 1);
+}
+
+static unsigned int ts4host(unsigned int type_len_ts)
+{
+	if (file_bigendian)
+		return type_len_ts & ((1 << 27) - 1);
+	else
+		return type_len_ts >> 5;
+}
+
+static int calc_index(void *ptr, int cpu)
+{
+	return (unsigned long)ptr - (unsigned long)cpu_data[cpu].page;
+}
+
+struct record *trace_peek_data(int cpu)
+{
+	struct record *data;
+	void *page = cpu_data[cpu].page;
+	int idx = cpu_data[cpu].index;
+	void *ptr = page + idx;
+	unsigned long long extend;
+	unsigned int type_len_ts;
+	unsigned int type_len;
+	unsigned int delta;
+	unsigned int length = 0;
+
+	if (cpu_data[cpu].next)
+		return cpu_data[cpu].next;
+
+	if (!page)
+		return NULL;
+
+	if (!idx) {
+		/* FIXME: handle header page */
+		if (header_page_ts_size != 8)
+			die("expected a long long type for timestamp");
+		cpu_data[cpu].timestamp = data2host8(ptr);
+		ptr += 8;
+		switch (header_page_size_size) {
+		case 4:
+			cpu_data[cpu].page_size = data2host4(ptr);
+			ptr += 4;
+			break;
+		case 8:
+			cpu_data[cpu].page_size = data2host8(ptr);
+			ptr += 8;
+			break;
+		default:
+			die("bad long size");
+		}
+		ptr = cpu_data[cpu].page + header_page_data_offset;
+	}
+
+read_again:
+	idx = calc_index(ptr, cpu);
+
+	if (idx >= cpu_data[cpu].page_size) {
+		get_next_page(cpu);
+		return trace_peek_data(cpu);
+	}
+
+	type_len_ts = data2host4(ptr);
+	ptr += 4;
+
+	type_len = type_len4host(type_len_ts);
+	delta = ts4host(type_len_ts);
+
+	switch (type_len) {
+	case RINGBUF_TYPE_PADDING:
+		if (!delta)
+			die("error, hit unexpected end of page");
+		length = data2host4(ptr);
+		ptr += 4;
+		length *= 4;
+		ptr += length;
+		goto read_again;
+
+	case RINGBUF_TYPE_TIME_EXTEND:
+		extend = data2host4(ptr);
+		ptr += 4;
+		extend <<= TS_SHIFT;
+		extend += delta;
+		cpu_data[cpu].timestamp += extend;
+		goto read_again;
+
+	case RINGBUF_TYPE_TIME_STAMP:
+		ptr += 12;
+		break;
+	case 0:
+		length = data2host4(ptr);
+		ptr += 4;
+		die("here! length=%d", length);
+		break;
+	default:
+		length = type_len * 4;
+		break;
+	}
+
+	cpu_data[cpu].timestamp += delta;
+
+	data = malloc_or_die(sizeof(*data));
+	memset(data, 0, sizeof(*data));
+
+	data->ts = cpu_data[cpu].timestamp;
+	data->size = length;
+	data->data = ptr;
+	ptr += length;
+
+	cpu_data[cpu].index = calc_index(ptr, cpu);
+	cpu_data[cpu].next = data;
+
+	return data;
+}
+
+struct record *trace_read_data(int cpu)
+{
+	struct record *data;
+
+	data = trace_peek_data(cpu);
+	cpu_data[cpu].next = NULL;
+
+	return data;
+}
+
+void trace_report (void)
+{
+	const char *input_file = "trace.info";
+	char buf[BUFSIZ];
+	char test[] = { 23, 8, 68 };
+	char *version;
+	int show_funcs = 0;
+	int show_printk = 0;
+
+	input_fd = open(input_file, O_RDONLY);
+	if (input_fd < 0)
+		die("opening '%s'\n", input_file);
+
+	read_or_die(buf, 3);
+	if (memcmp(buf, test, 3) != 0)
+		die("not an trace data file");
+
+	read_or_die(buf, 7);
+	if (memcmp(buf, "tracing", 7) != 0)
+		die("not a trace file (missing tracing)");
+
+	version = read_string();
+	printf("version = %s\n", version);
+	free(version);
+
+	read_or_die(buf, 1);
+	file_bigendian = buf[0];
+	host_bigendian = bigendian();
+
+	read_or_die(buf, 1);
+	long_size = buf[0];
+
+	page_size = read4();
+
+	read_header_files();
+
+	read_ftrace_files();
+	read_event_files();
+	read_proc_kallsyms();
+	read_ftrace_printk();
+
+	if (show_funcs) {
+		print_funcs();
+		return;
+	}
+	if (show_printk) {
+		print_printk();
+		return;
+	}
+
+	return;
+}

tools/perf/util/trace-event.h

@@ -0,0 +1,239 @@
+#ifndef _TRACE_EVENTS_H
+#define _TRACE_EVENTS_H
+
+#include "parse-events.h"
+
+#define __unused __attribute__((unused))
+
+
+#ifndef PAGE_MASK
+#define PAGE_MASK (page_size - 1)
+#endif
+
+enum {
+	RINGBUF_TYPE_PADDING		= 29,
+	RINGBUF_TYPE_TIME_EXTEND	= 30,
+	RINGBUF_TYPE_TIME_STAMP		= 31,
+};
+
+#ifndef TS_SHIFT
+#define TS_SHIFT		27
+#endif
+
+#define NSECS_PER_SEC		1000000000ULL
+#define NSECS_PER_USEC		1000ULL
+
+enum format_flags {
+	FIELD_IS_ARRAY		= 1,
+	FIELD_IS_POINTER	= 2,
+};
+
+struct format_field {
+	struct format_field	*next;
+	char			*type;
+	char			*name;
+	int			offset;
+	int			size;
+	unsigned long		flags;
+};
+
+struct format {
+	int			nr_common;
+	int			nr_fields;
+	struct format_field	*common_fields;
+	struct format_field	*fields;
+};
+
+struct print_arg_atom {
+	char			*atom;
+};
+
+struct print_arg_string {
+	char			*string;
+};
+
+struct print_arg_field {
+	char			*name;
+	struct format_field	*field;
+};
+
+struct print_flag_sym {
+	struct print_flag_sym	*next;
+	char			*value;
+	char			*str;
+};
+
+struct print_arg_typecast {
+	char 			*type;
+	struct print_arg	*item;
+};
+
+struct print_arg_flags {
+	struct print_arg	*field;
+	char			*delim;
+	struct print_flag_sym	*flags;
+};
+
+struct print_arg_symbol {
+	struct print_arg	*field;
+	struct print_flag_sym	*symbols;
+};
+
+struct print_arg;
+
+struct print_arg_op {
+	char			*op;
+	int			prio;
+	struct print_arg	*left;
+	struct print_arg	*right;
+};
+
+struct print_arg_func {
+	char			*name;
+	struct print_arg	*args;
+};
+
+enum print_arg_type {
+	PRINT_NULL,
+	PRINT_ATOM,
+	PRINT_FIELD,
+	PRINT_FLAGS,
+	PRINT_SYMBOL,
+	PRINT_TYPE,
+	PRINT_STRING,
+	PRINT_OP,
+};
+
+struct print_arg {
+	struct print_arg		*next;
+	enum print_arg_type		type;
+	union {
+		struct print_arg_atom		atom;
+		struct print_arg_field		field;
+		struct print_arg_typecast	typecast;
+		struct print_arg_flags		flags;
+		struct print_arg_symbol		symbol;
+		struct print_arg_func		func;
+		struct print_arg_string		string;
+		struct print_arg_op		op;
+	};
+};
+
+struct print_fmt {
+	char			*format;
+	struct print_arg	*args;
+};
+
+struct event {
+	struct event		*next;
+	char			*name;
+	int			id;
+	int			flags;
+	struct format		format;
+	struct print_fmt	print_fmt;
+};
+
+enum {
+	EVENT_FL_ISFTRACE	= 1,
+	EVENT_FL_ISPRINT	= 2,
+	EVENT_FL_ISBPRINT	= 4,
+	EVENT_FL_ISFUNC		= 8,
+	EVENT_FL_ISFUNCENT	= 16,
+	EVENT_FL_ISFUNCRET	= 32,
+};
+
+struct record {
+	unsigned long long ts;
+	int size;
+	void *data;
+};
+
+struct record *trace_peek_data(int cpu);
+struct record *trace_read_data(int cpu);
+
+void parse_set_info(int nr_cpus, int long_sz);
+
+void trace_report(void);
+
+void *malloc_or_die(unsigned int size);
+
+void parse_cmdlines(char *file, int size);
+void parse_proc_kallsyms(char *file, unsigned int size);
+void parse_ftrace_printk(char *file, unsigned int size);
+
+void print_funcs(void);
+void print_printk(void);
+
+int parse_ftrace_file(char *buf, unsigned long size);
+int parse_event_file(char *buf, unsigned long size, char *system);
+void print_event(int cpu, void *data, int size, unsigned long long nsecs,
+		  char *comm);
+
+extern int file_bigendian;
+extern int host_bigendian;
+
+int bigendian(void);
+
+static inline unsigned short __data2host2(unsigned short data)
+{
+	unsigned short swap;
+
+	if (host_bigendian == file_bigendian)
+		return data;
+
+	swap = ((data & 0xffULL) << 8) |
+		((data & (0xffULL << 8)) >> 8);
+
+	return swap;
+}
+
+static inline unsigned int __data2host4(unsigned int data)
+{
+	unsigned int swap;
+
+	if (host_bigendian == file_bigendian)
+		return data;
+
+	swap = ((data & 0xffULL) << 24) |
+		((data & (0xffULL << 8)) << 8) |
+		((data & (0xffULL << 16)) >> 8) |
+		((data & (0xffULL << 24)) >> 24);
+
+	return swap;
+}
+
+static inline unsigned long long __data2host8(unsigned long long data)
+{
+	unsigned long long swap;
+
+	if (host_bigendian == file_bigendian)
+		return data;
+
+	swap = ((data & 0xffULL) << 56) |
+		((data & (0xffULL << 8)) << 40) |
+		((data & (0xffULL << 16)) << 24) |
+		((data & (0xffULL << 24)) << 8) |
+		((data & (0xffULL << 32)) >> 8) |
+		((data & (0xffULL << 40)) >> 24) |
+		((data & (0xffULL << 48)) >> 40) |
+		((data & (0xffULL << 56)) >> 56);
+
+	return swap;
+}
+
+#define data2host2(ptr)		__data2host2(*(unsigned short *)ptr)
+#define data2host4(ptr)		__data2host4(*(unsigned int *)ptr)
+#define data2host8(ptr)		__data2host8(*(unsigned long long *)ptr)
+
+extern int header_page_ts_offset;
+extern int header_page_ts_size;
+extern int header_page_size_offset;
+extern int header_page_size_size;
+extern int header_page_data_offset;
+extern int header_page_data_size;
+
+int parse_header_page(char *buf, unsigned long size);
+
+void read_tracing_data(struct perf_counter_attr *pattrs, int nb_counters);
+
+#endif /* _TRACE_EVENTS_H */

tools/perf/util/util.h

@@ -307,6 +307,7 @@ static inline int has_extension(const char *filename, const char *ext)
 #undef isspace
 #undef isdigit
 #undef isalpha
+#undef isprint
 #undef isalnum
 #undef tolower
 #undef toupper