tracecmd/trace-split.c - platform/external/trace-cmd - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <[email protected]>
  *
  */
 #define _LARGEFILE64_SOURCE
 #include <dirent.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <libgen.h>
 #include <getopt.h>
 #include <stdarg.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/mman.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <ctype.h>
 #include <errno.h>

 #include "trace-local.h"

 static unsigned int page_size;
 static const char *default_input_file = DEFAULT_INPUT_FILE;
 static const char *input_file;

 enum split_types {
 	SPLIT_NONE,
 	/* The order of these must be reverse of the case statement in the options */
 	SPLIT_SECONDS,
 	SPLIT_MSECS,
 	SPLIT_USECS,
 	SPLIT_EVENTS,
 	SPLIT_PAGES,
 	SPLIT_NR_TYPES,
 };

 struct cpu_data {
 	unsigned long long		ts;
 	unsigned long long		offset;
 	struct tep_record		*record;
 	int				cpu;
 	int				fd;
 	int				index;
 	void				*commit;
 	void				*page;
 	char				*file;
 };

 static int create_type_len(struct tep_handle *pevent, int time, int len)
 {
 	static int bigendian = -1;
 	char *ptr;
 	int test;

 	if (bigendian < 0) {
 		test = 0x4321;
 		ptr = (char *)&test;
 		if (*ptr == 0x21)
 			bigendian = 0;
 		else
 			bigendian = 1;
 	}

 	if (tep_is_file_bigendian(pevent))
 		time |= (len << 27);
 	else
 		time = (time << 5) | len;

 	return tep_read_number(pevent, &time, 4);
 }

 static int write_record(struct tracecmd_input *handle,
 			struct tep_record *record,
 			struct cpu_data *cpu_data,
 			enum split_types type)
 {
 	unsigned long long diff;
 	struct tep_handle *pevent;
 	void *page;
 	int len = 0;
 	char *ptr;
 	int index = 0;
 	int time;

 	page = cpu_data->page;

 	pevent = tracecmd_get_tep(handle);

 	ptr = page + cpu_data->index;

 	diff = record->ts - cpu_data->ts;
 	if (diff > (1 << 27)) {
 		/* Add a time stamp */
 		len = RINGBUF_TYPE_TIME_EXTEND;
 		time = (unsigned int)(diff & ((1ULL << 27) - 1));
 		time = create_type_len(pevent, time, len);
 		*(unsigned *)ptr = time;
 		ptr += 4;
 		time = (unsigned int)(diff >> 27);
 		*(unsigned *)ptr = tep_read_number(pevent, &time, 4);
 		cpu_data->ts = record->ts;
 		cpu_data->index += 8;
 		return 0;
 	}

 	if (record->size && (record->size <= 28 * 4))
 		len = record->size / 4;

 	time = (unsigned)diff;
 	time = create_type_len(pevent, time, len);

 	memcpy(ptr, &time, 4);
 	ptr += 4;
 	index = 4;

 	if (!len) {
 		len = record->size + 4;
 		if ((len + 4) > record->record_size)
 			die("Bad calculation of record len (expect:%d actual:%d)",
 			    record->record_size, len + 4);
 		*(unsigned *)ptr = tep_read_number(pevent, &len, 4);
 		ptr += 4;
 		index += 4;
 	}

 	len = (record->size + 3) & ~3;
 	index += len;

 	memcpy(ptr, record->data, len);

 	cpu_data->index += index;
 	cpu_data->ts = record->ts;

 	return 1;
 }

 static void write_page(struct tep_handle *pevent,
 		       struct cpu_data *cpu_data, int long_size)
 {
 	if (long_size == 8) {
 		unsigned long long index = cpu_data->index - 16;
 		*(unsigned long long *)cpu_data->commit =
 				tep_read_number(pevent, &index, 8);
 	} else {
 		unsigned int index = cpu_data->index - 12;
 		*(unsigned int *)cpu_data->commit =
 			tep_read_number(pevent, &index, 4);
 	}
 	write(cpu_data->fd, cpu_data->page, page_size);
 }

 static struct tep_record *read_record(struct tracecmd_input *handle,
 				      int percpu, int *cpu)
 {
 	if (percpu)
 		return tracecmd_read_data(handle, *cpu);

 	return tracecmd_read_next_data(handle, cpu);
 }

 static void set_cpu_time(struct tracecmd_input *handle,
 			 int percpu, unsigned long long start, int cpu, int cpus)
 {
 	if (percpu) {
 		tracecmd_set_cpu_to_timestamp(handle, cpu, start);
 		return;
 	}

 	for (cpu = 0; cpu < cpus; cpu++)
 		tracecmd_set_cpu_to_timestamp(handle, cpu, start);
 	return;
 }

 static int parse_cpu(struct tracecmd_input *handle,
 		     struct cpu_data *cpu_data,
 		     unsigned long long start,
 		     unsigned long long end,
 		     int count_limit, int percpu, int cpu,
 		     enum split_types type)
 {
 	struct tep_record *record;
 	struct tep_handle *pevent;
 	void *ptr;
 	int page_size;
 	int long_size = 0;
 	int cpus;
 	int count = 0;
 	int pages = 0;

 	cpus = tracecmd_cpus(handle);

 	long_size = tracecmd_long_size(handle);
 	page_size = tracecmd_page_size(handle);
 	pevent = tracecmd_get_tep(handle);

 	/* Force new creation of first page */
 	if (percpu) {
 		cpu_data[cpu].index = page_size + 1;
 		cpu_data[cpu].page = NULL;
 	} else {
 		for (cpu = 0; cpu < cpus; cpu++) {
 			cpu_data[cpu].index = page_size + 1;
 			cpu_data[cpu].page = NULL;
 		}
 	}

 	/*
 	 * Get the cpu pointers up to the start of the
 	 * start time stamp.
 	 */

 	record = read_record(handle, percpu, &cpu);

 	if (start) {
 		set_cpu_time(handle, percpu, start, cpu, cpus);
 		while (record && record->ts < start) {
 			tracecmd_free_record(record);
 			record = read_record(handle, percpu, &cpu);
 		}
 	} else if (record)
 		start = record->ts;

 	while (record && (!end || record->ts <= end)) {
 		if (cpu_data[cpu].index + record->record_size > page_size) {

 			if (type == SPLIT_PAGES && ++pages > count_limit)
 				break;

 			if (cpu_data[cpu].page)
 				write_page(pevent, &cpu_data[cpu], long_size);
 			else {
 				cpu_data[cpu].page = malloc(page_size);
 				if (!cpu_data[cpu].page)
 					die("Failed to allocate page");
 			}

 			memset(cpu_data[cpu].page, 0, page_size);
 			ptr = cpu_data[cpu].page;

 			*(unsigned long long*)ptr =
 				tep_read_number(pevent, &(record->ts), 8);
 			cpu_data[cpu].ts = record->ts;
 			ptr += 8;
 			cpu_data[cpu].commit = ptr;
 			ptr += long_size;
 			cpu_data[cpu].index = 8 + long_size;
 		}

 		cpu_data[cpu].offset = record->offset;

 		if (write_record(handle, record, &cpu_data[cpu], type)) {
 			tracecmd_free_record(record);
 			record = read_record(handle, percpu, &cpu);

 			/* if we hit the end of the cpu, clear the offset */
 			if (!record) {
 				if (percpu)
 					cpu_data[cpu].offset = 0;
 				else
 					for (cpu = 0; cpu < cpus; cpu++)
 						cpu_data[cpu].offset = 0;
 			}

 			switch (type) {
 			case SPLIT_NONE:
 				break;
 			case SPLIT_SECONDS:
 				if (record &&
 				    record->ts >
 				    (start + (unsigned long long)count_limit * 1000000000ULL)) {
 					tracecmd_free_record(record);
 					record = NULL;
 				}
 				break;
 			case SPLIT_MSECS:
 				if (record &&
 				    record->ts >
 				    (start + (unsigned long long)count_limit * 1000000ULL)) {
 					tracecmd_free_record(record);
 					record = NULL;
 				}
 				break;
 			case SPLIT_USECS:
 				if (record &&
 				    record->ts >
 				    (start + (unsigned long long)count_limit * 1000ULL)) {
 					tracecmd_free_record(record);
 					record = NULL;
 				}
 				break;
 			case SPLIT_EVENTS:
 				if (++count >= count_limit) {
 					tracecmd_free_record(record);
 					record = NULL;
 				}
 				break;
 			default:
 				break;
 			}
 		}
 	}

 	if (record)
 		tracecmd_free_record(record);

 	if (percpu) {
 		if (cpu_data[cpu].page) {
 			write_page(pevent, &cpu_data[cpu], long_size);
 			free(cpu_data[cpu].page);
 			cpu_data[cpu].page = NULL;
 		}
 	} else {
 		for (cpu = 0; cpu < cpus; cpu++) {
 			if (cpu_data[cpu].page) {
 				write_page(pevent, &cpu_data[cpu], long_size);
 				free(cpu_data[cpu].page);
 				cpu_data[cpu].page = NULL;
 			}
 		}
 	}

 	return 0;
 }

 static double parse_file(struct tracecmd_input *handle,
 			 const char *output_file,
 			 unsigned long long start,
 			 unsigned long long end, int percpu, int only_cpu,
 			 int count, enum split_types type)
 {
 	unsigned long long current;
 	struct tracecmd_output *ohandle;
 	struct cpu_data *cpu_data;
 	struct tep_record *record;
 	char **cpu_list;
 	char *output;
 	char *base;
 	char *file;
 	char *dir;
 	int cpus;
 	int cpu;
 	int fd;

 	output = strdup(output_file);
 	dir = dirname(output);
 	base = basename(output);

 	ohandle = tracecmd_copy(handle, output_file, TRACECMD_FILE_CMD_LINES, 0, NULL);

 	cpus = tracecmd_cpus(handle);
 	cpu_data = malloc(sizeof(*cpu_data) * cpus);
 	if (!cpu_data)
 		die("Failed to allocate cpu_data for %d cpus", cpus);

 	for (cpu = 0; cpu < cpus; cpu++) {
 		int ret;

 		ret = asprintf(&file, "%s/.tmp.%s.%d", dir, base, cpu);
 		if (ret < 0)
 			die("Failed to allocate file for %s %s %d", dir, base, cpu);
 		fd = open(file, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
 		cpu_data[cpu].cpu = cpu;
 		cpu_data[cpu].fd = fd;
 		cpu_data[cpu].file = file;
 		cpu_data[cpu].offset = 0;
 		if (start)
 			tracecmd_set_cpu_to_timestamp(handle, cpu, start);
 	}

 	if (only_cpu >= 0) {
 		parse_cpu(handle, cpu_data, start, end, count,
 			  1, only_cpu, type);
 	} else if (percpu) {
 		for (cpu = 0; cpu < cpus; cpu++)
 			parse_cpu(handle, cpu_data, start,
 				  end, count, percpu, cpu, type);
 	} else
 		parse_cpu(handle, cpu_data, start,
 			  end, count, percpu, -1, type);

 	cpu_list = malloc(sizeof(*cpu_list) * cpus);
 	if (!cpu_list)
 		die("Failed to allocate cpu_list for %d cpus", cpus);
 	for (cpu = 0; cpu < cpus; cpu ++)
 		cpu_list[cpu] = cpu_data[cpu].file;

 	tracecmd_set_out_clock(ohandle, tracecmd_get_trace_clock(handle));
 	if (tracecmd_append_cpu_data(ohandle, cpus, cpu_list) < 0)
 		die("Failed to append tracing data\n");

 	current = end;
 	for (cpu = 0; cpu < cpus; cpu++) {
 		/* Set the tracecmd cursor to the next set of records */
 		if (cpu_data[cpu].offset) {
 			record = tracecmd_read_at(handle, cpu_data[cpu].offset, NULL);
 			if (record && (!current || record->ts > current))
 				current = record->ts + 1;
 			tracecmd_free_record(record);
 		}
 		unlink(cpu_data[cpu].file);
 		free(cpu_data[cpu].file);
 	}
 	free(cpu_data);
 	free(cpu_list);
 	free(output);
 	tracecmd_output_close(ohandle);

 	return current;
 }

 void trace_split (int argc, char **argv)
 {
 	struct tracecmd_input *handle;
 	unsigned long long start_ns = 0, end_ns = 0;
 	unsigned long long current;
 	double start, end;
 	char *endptr;
 	char *output = NULL;
 	char *output_file;
 	enum split_types split_type = SPLIT_NONE;
 	enum split_types type = SPLIT_NONE;
 	int count;
 	int repeat = 0;
 	int percpu = 0;
 	int cpu = -1;
 	int ac;
 	int c;

 	if (strcmp(argv[1], "split") != 0)
 		usage(argv);

 	while ((c = getopt(argc-1, argv+1, "+ho:i:s:m:u:e:p:rcC:")) >= 0) {
 		switch (c) {
 		case 'h':
 			usage(argv);
 			break;
 		case 'p':
 			type++;
 		case 'e':
 			type++;
 		case 'u':
 			type++;
 		case 'm':
 			type++;
 		case 's':
 			type++;
 			if (split_type != SPLIT_NONE)
 				die("Only one type of split is allowed");
 			count = atoi(optarg);
 			if (count <= 0)
 				die("Units must be greater than 0");
 			split_type = type;

 			/* Spliting by pages only makes sense per cpu */
 			if (type == SPLIT_PAGES)
 				percpu = 1;
 			break;
 		case 'r':
 			repeat = 1;
 			break;
 		case 'c':
 			percpu = 1;
 			break;
 		case 'C':
 			cpu = atoi(optarg);
 			break;
 		case 'o':
 			if (output)
 				die("only one output file allowed");
 			output = strdup(optarg);
 			break;
 		case 'i':
 			input_file = optarg;
 			break;
 		default:
 			usage(argv);
 		}
 	}

 	ac = (argc - optind);

 	if (ac >= 2) {
 		optind++;
 		start = strtod(argv[optind], &endptr);
 		if (ac > 3)
 			usage(argv);

 		/* Make sure a true start value was entered */
 		if (*endptr != 0)
 			die("Start value not floating point: %s", argv[optind]);

 		start_ns = (unsigned long long)(start * 1000000000.0);
 		optind++;
 		if (ac == 3) {
 			end = strtod(argv[optind], &endptr);

 			/* Make sure a true end value was entered */
 			if (*endptr != 0)
 				die("End value not floating point: %s",
 				    argv[optind]);

 			end_ns = (unsigned long long)(end * 1000000000.0);
 			if (end_ns < start_ns)
 				die("Error: end is less than start");
 		}
 	}

 	if (!input_file)
 		input_file = default_input_file;

 	handle = tracecmd_open(input_file, 0);
 	if (!handle)
 		die("error reading %s", input_file);

 	if (tracecmd_get_file_state(handle) == TRACECMD_FILE_CPU_LATENCY)
 		die("trace-cmd split does not work with latency traces\n");

 	page_size = tracecmd_page_size(handle);

 	if (!output)
 		output = strdup(input_file);

 	if (!repeat) {
 		output = realloc(output, strlen(output) + 3);
 		strcat(output, ".1");
 	}

 	current = start_ns;
 	output_file = malloc(strlen(output) + 50);
 	if (!output_file)
 		die("Failed to allocate for %s", output);
 	c = 1;

 	do {
 		if (repeat)
 			sprintf(output_file, "%s.%04d", output, c++);
 		else
 			strcpy(output_file, output);

 		current = parse_file(handle, output_file, start_ns, end_ns,
 				     percpu, cpu, count, type);
 		if (!repeat)
 			break;
 		start_ns = 0;
 	} while (current && (!end_ns || current < end_ns));

 	free(output);
 	free(output_file);

 	tracecmd_close(handle);

 	return;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2010 Red Hat Inc, Steven Rostedt <[email protected]>
	*
	*/
	#define _LARGEFILE64_SOURCE
	#include <dirent.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <libgen.h>
	#include <getopt.h>
	#include <stdarg.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/wait.h>
	#include <sys/mman.h>
	#include <fcntl.h>
	#include <unistd.h>
	#include <ctype.h>
	#include <errno.h>

	#include "trace-local.h"

	static unsigned int page_size;
	static const char *default_input_file = DEFAULT_INPUT_FILE;
	static const char *input_file;

	enum split_types {
	SPLIT_NONE,
	/* The order of these must be reverse of the case statement in the options */
	SPLIT_SECONDS,
	SPLIT_MSECS,
	SPLIT_USECS,
	SPLIT_EVENTS,
	SPLIT_PAGES,
	SPLIT_NR_TYPES,
	};

	struct cpu_data {
	unsigned long long ts;
	unsigned long long offset;
	struct tep_record *record;
	int cpu;
	int fd;
	int index;
	void *commit;
	void *page;
	char *file;
	};

	static int create_type_len(struct tep_handle *pevent, int time, int len)
	{
	static int bigendian = -1;
	char *ptr;
	int test;

	if (bigendian < 0) {
	test = 0x4321;
	ptr = (char *)&test;
	if (*ptr == 0x21)
	bigendian = 0;
	else
	bigendian = 1;
	}

	if (tep_is_file_bigendian(pevent))
	time \|= (len << 27);
	else
	time = (time << 5) \| len;

	return tep_read_number(pevent, &time, 4);
	}

	static int write_record(struct tracecmd_input *handle,
	struct tep_record *record,
	struct cpu_data *cpu_data,
	enum split_types type)
	{
	unsigned long long diff;
	struct tep_handle *pevent;
	void *page;
	int len = 0;
	char *ptr;
	int index = 0;
	int time;

	page = cpu_data->page;

	pevent = tracecmd_get_tep(handle);

	ptr = page + cpu_data->index;

	diff = record->ts - cpu_data->ts;
	if (diff > (1 << 27)) {
	/* Add a time stamp */
	len = RINGBUF_TYPE_TIME_EXTEND;
	time = (unsigned int)(diff & ((1ULL << 27) - 1));
	time = create_type_len(pevent, time, len);
	(unsigned )ptr = time;
	ptr += 4;
	time = (unsigned int)(diff >> 27);
	(unsigned )ptr = tep_read_number(pevent, &time, 4);
	cpu_data->ts = record->ts;
	cpu_data->index += 8;
	return 0;
	}

	if (record->size && (record->size <= 28 * 4))
	len = record->size / 4;

	time = (unsigned)diff;
	time = create_type_len(pevent, time, len);

	memcpy(ptr, &time, 4);
	ptr += 4;
	index = 4;

	if (!len) {
	len = record->size + 4;
	if ((len + 4) > record->record_size)
	die("Bad calculation of record len (expect:%d actual:%d)",
	record->record_size, len + 4);
	(unsigned )ptr = tep_read_number(pevent, &len, 4);
	ptr += 4;
	index += 4;
	}

	len = (record->size + 3) & ~3;
	index += len;

	memcpy(ptr, record->data, len);

	cpu_data->index += index;
	cpu_data->ts = record->ts;

	return 1;
	}

	static void write_page(struct tep_handle *pevent,
	struct cpu_data *cpu_data, int long_size)
	{
	if (long_size == 8) {
	unsigned long long index = cpu_data->index - 16;
	(unsigned long long )cpu_data->commit =
	tep_read_number(pevent, &index, 8);
	} else {
	unsigned int index = cpu_data->index - 12;
	(unsigned int )cpu_data->commit =
	tep_read_number(pevent, &index, 4);
	}
	write(cpu_data->fd, cpu_data->page, page_size);
	}

	static struct tep_record read_record(struct tracecmd_input handle,
	int percpu, int *cpu)
	{
	if (percpu)
	return tracecmd_read_data(handle, *cpu);

	return tracecmd_read_next_data(handle, cpu);
	}

	static void set_cpu_time(struct tracecmd_input *handle,
	int percpu, unsigned long long start, int cpu, int cpus)
	{
	if (percpu) {
	tracecmd_set_cpu_to_timestamp(handle, cpu, start);
	return;
	}

	for (cpu = 0; cpu < cpus; cpu++)
	tracecmd_set_cpu_to_timestamp(handle, cpu, start);
	return;
	}

	static int parse_cpu(struct tracecmd_input *handle,
	struct cpu_data *cpu_data,
	unsigned long long start,
	unsigned long long end,
	int count_limit, int percpu, int cpu,
	enum split_types type)
	{
	struct tep_record *record;
	struct tep_handle *pevent;
	void *ptr;
	int page_size;
	int long_size = 0;
	int cpus;
	int count = 0;
	int pages = 0;

	cpus = tracecmd_cpus(handle);

	long_size = tracecmd_long_size(handle);
	page_size = tracecmd_page_size(handle);
	pevent = tracecmd_get_tep(handle);

	/* Force new creation of first page */
	if (percpu) {
	cpu_data[cpu].index = page_size + 1;
	cpu_data[cpu].page = NULL;
	} else {
	for (cpu = 0; cpu < cpus; cpu++) {
	cpu_data[cpu].index = page_size + 1;
	cpu_data[cpu].page = NULL;
	}
	}

	/*
	* Get the cpu pointers up to the start of the
	* start time stamp.
	*/

	record = read_record(handle, percpu, &cpu);

	if (start) {
	set_cpu_time(handle, percpu, start, cpu, cpus);
	while (record && record->ts < start) {
	tracecmd_free_record(record);
	record = read_record(handle, percpu, &cpu);
	}
	} else if (record)
	start = record->ts;

	while (record && (!end \|\| record->ts <= end)) {
	if (cpu_data[cpu].index + record->record_size > page_size) {

	if (type == SPLIT_PAGES && ++pages > count_limit)
	break;

	if (cpu_data[cpu].page)
	write_page(pevent, &cpu_data[cpu], long_size);
	else {
	cpu_data[cpu].page = malloc(page_size);
	if (!cpu_data[cpu].page)
	die("Failed to allocate page");
	}

	memset(cpu_data[cpu].page, 0, page_size);
	ptr = cpu_data[cpu].page;

	(unsigned long long)ptr =
	tep_read_number(pevent, &(record->ts), 8);
	cpu_data[cpu].ts = record->ts;
	ptr += 8;
	cpu_data[cpu].commit = ptr;
	ptr += long_size;
	cpu_data[cpu].index = 8 + long_size;
	}

	cpu_data[cpu].offset = record->offset;

	if (write_record(handle, record, &cpu_data[cpu], type)) {
	tracecmd_free_record(record);
	record = read_record(handle, percpu, &cpu);

	/* if we hit the end of the cpu, clear the offset */
	if (!record) {
	if (percpu)
	cpu_data[cpu].offset = 0;
	else
	for (cpu = 0; cpu < cpus; cpu++)
	cpu_data[cpu].offset = 0;
	}

	switch (type) {
	case SPLIT_NONE:
	break;
	case SPLIT_SECONDS:
	if (record &&
	record->ts >
	(start + (unsigned long long)count_limit * 1000000000ULL)) {
	tracecmd_free_record(record);
	record = NULL;
	}
	break;
	case SPLIT_MSECS:
	if (record &&
	record->ts >
	(start + (unsigned long long)count_limit * 1000000ULL)) {
	tracecmd_free_record(record);
	record = NULL;
	}
	break;
	case SPLIT_USECS:
	if (record &&
	record->ts >
	(start + (unsigned long long)count_limit * 1000ULL)) {
	tracecmd_free_record(record);
	record = NULL;
	}
	break;
	case SPLIT_EVENTS:
	if (++count >= count_limit) {
	tracecmd_free_record(record);
	record = NULL;
	}
	break;
	default:
	break;
	}
	}
	}

	if (record)
	tracecmd_free_record(record);

	if (percpu) {
	if (cpu_data[cpu].page) {
	write_page(pevent, &cpu_data[cpu], long_size);
	free(cpu_data[cpu].page);
	cpu_data[cpu].page = NULL;
	}
	} else {
	for (cpu = 0; cpu < cpus; cpu++) {
	if (cpu_data[cpu].page) {
	write_page(pevent, &cpu_data[cpu], long_size);
	free(cpu_data[cpu].page);
	cpu_data[cpu].page = NULL;
	}
	}
	}

	return 0;
	}

	static double parse_file(struct tracecmd_input *handle,
	const char *output_file,
	unsigned long long start,
	unsigned long long end, int percpu, int only_cpu,
	int count, enum split_types type)
	{
	unsigned long long current;
	struct tracecmd_output *ohandle;
	struct cpu_data *cpu_data;
	struct tep_record *record;
	char **cpu_list;
	char *output;
	char *base;
	char *file;
	char *dir;
	int cpus;
	int cpu;
	int fd;

	output = strdup(output_file);
	dir = dirname(output);
	base = basename(output);

	ohandle = tracecmd_copy(handle, output_file, TRACECMD_FILE_CMD_LINES, 0, NULL);

	cpus = tracecmd_cpus(handle);
	cpu_data = malloc(sizeof(cpu_data) cpus);
	if (!cpu_data)
	die("Failed to allocate cpu_data for %d cpus", cpus);

	for (cpu = 0; cpu < cpus; cpu++) {
	int ret;

	ret = asprintf(&file, "%s/.tmp.%s.%d", dir, base, cpu);
	if (ret < 0)
	die("Failed to allocate file for %s %s %d", dir, base, cpu);
	fd = open(file, O_WRONLY \| O_CREAT \| O_TRUNC \| O_LARGEFILE, 0644);
	cpu_data[cpu].cpu = cpu;
	cpu_data[cpu].fd = fd;
	cpu_data[cpu].file = file;
	cpu_data[cpu].offset = 0;
	if (start)
	tracecmd_set_cpu_to_timestamp(handle, cpu, start);
	}

	if (only_cpu >= 0) {
	parse_cpu(handle, cpu_data, start, end, count,
	1, only_cpu, type);
	} else if (percpu) {
	for (cpu = 0; cpu < cpus; cpu++)
	parse_cpu(handle, cpu_data, start,
	end, count, percpu, cpu, type);
	} else
	parse_cpu(handle, cpu_data, start,
	end, count, percpu, -1, type);

	cpu_list = malloc(sizeof(cpu_list) cpus);
	if (!cpu_list)
	die("Failed to allocate cpu_list for %d cpus", cpus);
	for (cpu = 0; cpu < cpus; cpu ++)
	cpu_list[cpu] = cpu_data[cpu].file;

	tracecmd_set_out_clock(ohandle, tracecmd_get_trace_clock(handle));
	if (tracecmd_append_cpu_data(ohandle, cpus, cpu_list) < 0)
	die("Failed to append tracing data\n");

	current = end;
	for (cpu = 0; cpu < cpus; cpu++) {
	/* Set the tracecmd cursor to the next set of records */
	if (cpu_data[cpu].offset) {
	record = tracecmd_read_at(handle, cpu_data[cpu].offset, NULL);
	if (record && (!current \|\| record->ts > current))
	current = record->ts + 1;
	tracecmd_free_record(record);
	}
	unlink(cpu_data[cpu].file);
	free(cpu_data[cpu].file);
	}
	free(cpu_data);
	free(cpu_list);
	free(output);
	tracecmd_output_close(ohandle);

	return current;
	}

	void trace_split (int argc, char **argv)
	{
	struct tracecmd_input *handle;
	unsigned long long start_ns = 0, end_ns = 0;
	unsigned long long current;
	double start, end;
	char *endptr;
	char *output = NULL;
	char *output_file;
	enum split_types split_type = SPLIT_NONE;
	enum split_types type = SPLIT_NONE;
	int count;
	int repeat = 0;
	int percpu = 0;
	int cpu = -1;
	int ac;
	int c;

	if (strcmp(argv[1], "split") != 0)
	usage(argv);

	while ((c = getopt(argc-1, argv+1, "+ho:i:s:m:u:e:p:rcC:")) >= 0) {
	switch (c) {
	case 'h':
	usage(argv);
	break;
	case 'p':
	type++;
	case 'e':
	type++;
	case 'u':
	type++;
	case 'm':
	type++;
	case 's':
	type++;
	if (split_type != SPLIT_NONE)
	die("Only one type of split is allowed");
	count = atoi(optarg);
	if (count <= 0)
	die("Units must be greater than 0");
	split_type = type;

	/* Spliting by pages only makes sense per cpu */
	if (type == SPLIT_PAGES)
	percpu = 1;
	break;
	case 'r':
	repeat = 1;
	break;
	case 'c':
	percpu = 1;
	break;
	case 'C':
	cpu = atoi(optarg);
	break;
	case 'o':
	if (output)
	die("only one output file allowed");
	output = strdup(optarg);
	break;
	case 'i':
	input_file = optarg;
	break;
	default:
	usage(argv);
	}
	}

	ac = (argc - optind);

	if (ac >= 2) {
	optind++;
	start = strtod(argv[optind], &endptr);
	if (ac > 3)
	usage(argv);

	/* Make sure a true start value was entered */
	if (*endptr != 0)
	die("Start value not floating point: %s", argv[optind]);

	start_ns = (unsigned long long)(start * 1000000000.0);
	optind++;
	if (ac == 3) {
	end = strtod(argv[optind], &endptr);

	/* Make sure a true end value was entered */
	if (*endptr != 0)
	die("End value not floating point: %s",
	argv[optind]);

	end_ns = (unsigned long long)(end * 1000000000.0);
	if (end_ns < start_ns)
	die("Error: end is less than start");
	}
	}

	if (!input_file)
	input_file = default_input_file;

	handle = tracecmd_open(input_file, 0);
	if (!handle)
	die("error reading %s", input_file);

	if (tracecmd_get_file_state(handle) == TRACECMD_FILE_CPU_LATENCY)
	die("trace-cmd split does not work with latency traces\n");

	page_size = tracecmd_page_size(handle);

	if (!output)
	output = strdup(input_file);

	if (!repeat) {
	output = realloc(output, strlen(output) + 3);
	strcat(output, ".1");
	}

	current = start_ns;
	output_file = malloc(strlen(output) + 50);
	if (!output_file)
	die("Failed to allocate for %s", output);
	c = 1;

	do {
	if (repeat)
	sprintf(output_file, "%s.%04d", output, c++);
	else
	strcpy(output_file, output);

	current = parse_file(handle, output_file, start_ns, end_ns,
	percpu, cpu, count, type);
	if (!repeat)
	break;
	start_ns = 0;
	} while (current && (!end_ns \|\| current < end_ns));

	free(output);
	free(output_file);

	tracecmd_close(handle);

	return;
	}