[fio.git] / fio.h

#ifndef FIO_H
#define FIO_H

#include <sched.h>
#include <limits.h>
#include <pthread.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include "list.h"
#include "md5.h"
#include "crc32.h"
#include "arch.h"
#include "os.h"

struct io_stat {
	unsigned long val;
	unsigned long val_sq;
	unsigned long max_val;
	unsigned long min_val;
	unsigned long samples;
};

struct io_sample {
	unsigned long time;
	unsigned long val;
	unsigned int ddir;
};

struct io_log {
	unsigned long nr_samples;
	unsigned long max_samples;
	struct io_sample *log;
};

struct io_piece {
	struct list_head list;
	unsigned long long offset;
	unsigned int len;
	int ddir;
};

/*
 * The io unit
 */
struct io_u {
	union {
#ifdef FIO_HAVE_LIBAIO
		struct iocb iocb;
#endif
#ifdef FIO_HAVE_POSIXAIO
		struct aiocb aiocb;
#endif
#ifdef FIO_HAVE_SGIO
		struct sg_io_hdr hdr;
#endif
	};
	struct timeval start_time;
	struct timeval issue_time;

	char *buf;
	unsigned int buflen;
	unsigned long long offset;
	unsigned int index;

	unsigned int resid;
	unsigned int error;

	unsigned char seen;
	unsigned char ddir;

	struct list_head list;
};

#define FIO_HDR_MAGIC	0xf00baaef

enum {
	VERIFY_NONE = 0,
	VERIFY_MD5,
	VERIFY_CRC32,
};

struct verify_header {
	unsigned int fio_magic;
	unsigned int len;
	unsigned int verify_type;
	union {
		char md5_digest[MD5_HASH_WORDS * 4];
		unsigned long crc32;
	};
};

struct group_run_stats {
	unsigned long long max_run[2], min_run[2];
	unsigned long long max_bw[2], min_bw[2];
	unsigned long long io_kb[2];
	unsigned long long agg[2];
};

enum fio_ddir {
	DDIR_READ = 0,
	DDIR_WRITE,
};

/*
 * What type of allocation to use for io buffers
 */
enum fio_memtype {
	MEM_MALLOC = 0,	/* ordinary malloc */
	MEM_SHM,	/* use shared memory segments */
	MEM_MMAP,	/* use anonynomous mmap */
};

/*
 * The type of object we are working on
 */
enum fio_filetype {
	FIO_TYPE_FILE = 1,
	FIO_TYPE_BD,
	FIO_TYPE_CHAR,
};

enum fio_iotype {
	FIO_SYNCIO	= 1 << 0,
	FIO_MMAPIO	= 1 << 1 | FIO_SYNCIO,
	FIO_LIBAIO	= 1 << 2,
	FIO_POSIXAIO	= 1 << 3,
	FIO_SGIO	= 1 << 4,
	FIO_SPLICEIO	= 1 << 5 | FIO_SYNCIO,
	FIO_CPUIO	= 1 << 6,
};

/*
 * This describes a single thread/process executing a fio job.
 */
struct thread_data {
	char name[32];
	char *file_name;
	char *directory;
	char verror[80];
	pthread_t thread;
	int thread_number;
	int groupid;
	enum fio_filetype filetype;
	int error;
	int fd;
	void *mmap;
	pid_t pid;
	char *orig_buffer;
	size_t orig_buffer_size;
	volatile int terminate;
	volatile int runstate;
	enum fio_ddir ddir;
	unsigned int iomix;
	unsigned int ioprio;

	unsigned char sequential;
	unsigned char odirect;
	unsigned char create_file;
	unsigned char invalidate_cache;
	unsigned char create_serialize;
	unsigned char create_fsync;
	unsigned char end_fsync;
	unsigned char sync_io;
	unsigned char verify;
	unsigned char use_thread;
	unsigned char do_disk_util;
	unsigned char override_sync;
	unsigned char rand_repeatable;

	unsigned int bs;
	unsigned int min_bs;
	unsigned int max_bs;
	unsigned int thinktime;
	unsigned int fsync_blocks;
	unsigned int start_delay;
	unsigned long timeout;
	enum fio_iotype io_engine;
	unsigned int overwrite;
	unsigned int bw_avg_time;
	unsigned int loops;
	unsigned long long file_size;
	unsigned long long real_file_size;
	unsigned long long file_offset;
	unsigned long long zone_size;
	unsigned long long zone_skip;
	enum fio_memtype mem_type;
	unsigned int stonewall;
	unsigned int numjobs;
	unsigned int iodepth;
	os_cpu_mask_t cpumask;
	unsigned int iolog;
	unsigned int read_iolog;
	unsigned int write_iolog;
	unsigned int rwmixcycle;
	unsigned int rwmixread;
	unsigned int nice;

	char *iolog_file;
	void *iolog_buf;
	FILE *iolog_f;

	char *sysfs_root;
	char *ioscheduler;

	os_random_state_t bsrange_state;
	os_random_state_t verify_state;

	int shm_id;

	/*
	 * IO engine hooks, contains everything needed to submit an io_u
	 * to any of the available IO engines.
	 */
	void *io_data;
	char io_engine_name[16];
	int (*io_prep)(struct thread_data *, struct io_u *);
	int (*io_queue)(struct thread_data *, struct io_u *);
	int (*io_getevents)(struct thread_data *, int, int, struct timespec *);
	struct io_u *(*io_event)(struct thread_data *, int);
	int (*io_cancel)(struct thread_data *, struct io_u *);
	void (*io_cleanup)(struct thread_data *);
	int (*io_sync)(struct thread_data *);

	/*
	 * Current IO depth and list of free and busy io_u's.
	 */
	unsigned int cur_depth;
	struct list_head io_u_freelist;
	struct list_head io_u_busylist;

	/*
	 * Rate state
	 */
	unsigned int rate;
	unsigned int ratemin;
	unsigned int ratecycle;
	unsigned long rate_usec_cycle;
	long rate_pending_usleep;
	unsigned long rate_bytes;
	struct timeval lastrate;

	unsigned long runtime[2];		/* msec */
	unsigned long long io_size;
	unsigned long long total_io_size;

	unsigned long long io_blocks[2];
	unsigned long long io_bytes[2];
	unsigned long long zone_bytes;
	unsigned long long this_io_bytes[2];
	unsigned long long last_pos;
	volatile int mutex;

	/*
	 * State for random io, a bitmap of blocks done vs not done
	 */
	os_random_state_t random_state;
	unsigned long *file_map;
	unsigned int num_maps;

	/*
	 * CPU "io" cycle burner
	 */
	unsigned int cpuload;
	unsigned int cpucycle;

	/*
	 * bandwidth and latency stats
	 */
	struct io_stat clat_stat[2];		/* completion latency */
	struct io_stat slat_stat[2];		/* submission latency */
	struct io_stat bw_stat[2];		/* bandwidth stats */

	unsigned long long stat_io_bytes[2];
	struct timeval stat_sample_time[2];

	struct io_log *slat_log;
	struct io_log *clat_log;
	struct io_log *bw_log;

	struct timeval start;	/* start of this loop */
	struct timeval epoch;	/* time job was started */

	/*
	 * fio system usage accounting
	 */
	struct rusage ru_start;
	struct rusage ru_end;
	unsigned long usr_time;
	unsigned long sys_time;
	unsigned long ctx;

	/*
	 * read/write mixed workload state
	 */
	os_random_state_t rwmix_state;
	struct timeval rwmix_switch;
	enum fio_ddir rwmix_ddir;

	/*
	 * Pre-run and post-run shell
	 */
	char *exec_prerun;
	char *exec_postrun;

	/*
	 * IO historic logs
	 */
	struct list_head io_hist_list;
	struct list_head io_log_list;
};

#define __td_verror(td, err, msg)					\
	do {								\
		int e = (err);						\
		(td)->error = e;					\
		snprintf(td->verror, sizeof(td->verror) - 1, "file:%s:%d, error=%s", __FILE__, __LINE__, (msg));	\
	} while (0)


#define td_verror(td, err)	__td_verror((td), (err), strerror((err)))
#define td_vmsg(td, err, msg)	__td_verror((td), (err), (msg))

extern struct io_u *__get_io_u(struct thread_data *);
extern void put_io_u(struct thread_data *, struct io_u *);

extern int rate_quit;
extern int write_lat_log;
extern int write_bw_log;
extern int exitall_on_terminate;
extern int thread_number;
extern int shm_id;
extern int groupid;
extern int terse_output;
extern FILE *f_out;
extern FILE *f_err;

extern struct thread_data *threads;

#define td_read(td)		((td)->ddir == DDIR_READ)
#define td_write(td)		((td)->ddir == DDIR_WRITE)
#define td_rw(td)		((td)->iomix != 0)

#define BLOCKS_PER_MAP		(8 * sizeof(long))
#define TO_MAP_BLOCK(td, b)	((b) - ((td)->file_offset / (td)->min_bs))
#define RAND_MAP_IDX(td, b)	(TO_MAP_BLOCK(td, b) / BLOCKS_PER_MAP)
#define RAND_MAP_BIT(td, b)	(TO_MAP_BLOCK(td, b) & (BLOCKS_PER_MAP - 1))

#define MAX_JOBS	(1024)

struct disk_util_stat {
	unsigned ios[2];
	unsigned merges[2];
	unsigned long long sectors[2];
	unsigned ticks[2];
	unsigned io_ticks;
	unsigned time_in_queue;
};

struct disk_util {
	struct list_head list;

	char *name;
	char path[256];
	dev_t dev;

	struct disk_util_stat dus;
	struct disk_util_stat last_dus;

	unsigned long msec;
	struct timeval time;
};

struct io_completion_data {
	int nr;				/* input */

	int error;			/* output */
	unsigned long bytes_done[2];	/* output */
};

#define DISK_UTIL_MSEC	(250)

#ifndef min
#define min(a, b)	((a) < (b) ? (a) : (b))
#endif

/*
 * Log exports
 */
extern int read_iolog_get(struct thread_data *, struct io_u *);
extern void write_iolog_put(struct thread_data *, struct io_u *);
extern int init_iolog(struct thread_data *td);
extern void log_io_piece(struct thread_data *, struct io_u *);
extern void prune_io_piece_log(struct thread_data *);
extern void write_iolog_close(struct thread_data *);

/*
 * Logging
 */
extern void add_clat_sample(struct thread_data *, int, unsigned long);
extern void add_slat_sample(struct thread_data *, int, unsigned long);
extern void add_bw_sample(struct thread_data *, int);
extern void show_run_stats(void);
extern void init_disk_util(struct thread_data *);
extern void update_rusage_stat(struct thread_data *);
extern void update_io_ticks(void);
extern void disk_util_timer_arm(void);
extern void setup_log(struct io_log **);
extern void finish_log(struct thread_data *, struct io_log *, const char *);
extern int setup_rate(struct thread_data *);

/*
 * Time functions
 */
extern unsigned long utime_since(struct timeval *, struct timeval *);
extern unsigned long mtime_since(struct timeval *, struct timeval *);
extern unsigned long mtime_since_now(struct timeval *);
extern unsigned long time_since_now(struct timeval *);
extern void __usec_sleep(unsigned int);
extern void usec_sleep(struct thread_data *, unsigned long);
extern void rate_throttle(struct thread_data *, unsigned long, unsigned int);

/*
 * Init functions
 */
extern int parse_options(int, char **);
extern int init_random_state(struct thread_data *);

/*
 * This is a pretty crappy semaphore implementation, but with the use that fio
 * has (just signalling start/go conditions), it doesn't have to be better.
 * Naturally this would not work for any type of contended semaphore or
 * for real locking.
 */
static inline void fio_sem_init(volatile int *sem, int val)
{
	*sem = val;
}

static inline void fio_sem_down(volatile int *sem)
{
	while (*sem == 0)
		usleep(10000);

	(*sem)--;
}

static inline void fio_sem_up(volatile int *sem)
{
	(*sem)++;
}

/*
 * If logging output to a file, stderr should go to both stderr and f_err
 */
#define log_err(args...)	do {		\
	fprintf(f_err, ##args);			\
	if (f_err != stderr)			\
		fprintf(stderr, ##args);	\
	} while (0)

#endif
Commit	Line	Data
	1	#ifndef FIO_H
	2	#define FIO_H
	3
	4	#include <sched.h>
	5	#include <limits.h>
	6	#include <pthread.h>
	7	#include <sys/time.h>
	8	#include <sys/resource.h>
	9	#include <errno.h>
	10	#include <stdlib.h>
	11	#include <stdio.h>
	12	#include <unistd.h>
	13
	14	#include "list.h"
	15	#include "md5.h"
	16	#include "crc32.h"
	17	#include "arch.h"
	18	#include "os.h"
	19
	20	struct io_stat {
	21	unsigned long val;
	22	unsigned long val_sq;
	23	unsigned long max_val;
	24	unsigned long min_val;
	25	unsigned long samples;
	26	};
	27
	28	struct io_sample {
	29	unsigned long time;
	30	unsigned long val;
	31	unsigned int ddir;
	32	};
	33
	34	struct io_log {
	35	unsigned long nr_samples;
	36	unsigned long max_samples;
	37	struct io_sample *log;
	38	};
	39
	40	struct io_piece {
	41	struct list_head list;
	42	unsigned long long offset;
	43	unsigned int len;
	44	int ddir;
	45	};
	46
	47	/*
	48	* The io unit
	49	*/
	50	struct io_u {
	51	union {
	52	#ifdef FIO_HAVE_LIBAIO
	53	struct iocb iocb;
	54	#endif
	55	#ifdef FIO_HAVE_POSIXAIO
	56	struct aiocb aiocb;
	57	#endif
	58	#ifdef FIO_HAVE_SGIO
	59	struct sg_io_hdr hdr;
	60	#endif
	61	};
	62	struct timeval start_time;
	63	struct timeval issue_time;
	64
	65	char *buf;
	66	unsigned int buflen;
	67	unsigned long long offset;
	68	unsigned int index;
	69
	70	unsigned int resid;
	71	unsigned int error;
	72
	73	unsigned char seen;
	74	unsigned char ddir;
	75
	76	struct list_head list;
	77	};
	78
	79	#define FIO_HDR_MAGIC 0xf00baaef
	80
	81	enum {
	82	VERIFY_NONE = 0,
	83	VERIFY_MD5,
	84	VERIFY_CRC32,
	85	};
	86
	87	struct verify_header {
	88	unsigned int fio_magic;
	89	unsigned int len;
	90	unsigned int verify_type;
	91	union {
	92	char md5_digest[MD5_HASH_WORDS * 4];
	93	unsigned long crc32;
	94	};
	95	};
	96
	97	struct group_run_stats {
	98	unsigned long long max_run[2], min_run[2];
	99	unsigned long long max_bw[2], min_bw[2];
	100	unsigned long long io_kb[2];
	101	unsigned long long agg[2];
	102	};
	103
	104	enum fio_ddir {
	105	DDIR_READ = 0,
	106	DDIR_WRITE,
	107	};
	108
	109	/*
	110	* What type of allocation to use for io buffers
	111	*/
	112	enum fio_memtype {
	113	MEM_MALLOC = 0, /* ordinary malloc */
	114	MEM_SHM, /* use shared memory segments */
	115	MEM_MMAP, /* use anonynomous mmap */
	116	};
	117
	118	/*
	119	* The type of object we are working on
	120	*/
	121	enum fio_filetype {
	122	FIO_TYPE_FILE = 1,
	123	FIO_TYPE_BD,
	124	FIO_TYPE_CHAR,
	125	};
	126
	127	enum fio_iotype {
	128	FIO_SYNCIO = 1 << 0,
	129	FIO_MMAPIO = 1 << 1 \| FIO_SYNCIO,
	130	FIO_LIBAIO = 1 << 2,
	131	FIO_POSIXAIO = 1 << 3,
	132	FIO_SGIO = 1 << 4,
	133	FIO_SPLICEIO = 1 << 5 \| FIO_SYNCIO,
	134	FIO_CPUIO = 1 << 6,
	135	};
	136
	137	/*
	138	* This describes a single thread/process executing a fio job.
	139	*/
	140	struct thread_data {
	141	char name[32];
	142	char *file_name;
	143	char *directory;
	144	char verror[80];
	145	pthread_t thread;
	146	int thread_number;
	147	int groupid;
	148	enum fio_filetype filetype;
	149	int error;
	150	int fd;
	151	void *mmap;
	152	pid_t pid;
	153	char *orig_buffer;
	154	size_t orig_buffer_size;
	155	volatile int terminate;
	156	volatile int runstate;
	157	enum fio_ddir ddir;
	158	unsigned int iomix;
	159	unsigned int ioprio;
	160
	161	unsigned char sequential;
	162	unsigned char odirect;
	163	unsigned char create_file;
	164	unsigned char invalidate_cache;
	165	unsigned char create_serialize;
	166	unsigned char create_fsync;
	167	unsigned char end_fsync;
	168	unsigned char sync_io;
	169	unsigned char verify;
	170	unsigned char use_thread;
	171	unsigned char do_disk_util;
	172	unsigned char override_sync;
	173	unsigned char rand_repeatable;
	174
	175	unsigned int bs;
	176	unsigned int min_bs;
	177	unsigned int max_bs;
	178	unsigned int thinktime;
	179	unsigned int fsync_blocks;
	180	unsigned int start_delay;
	181	unsigned long timeout;
	182	enum fio_iotype io_engine;
	183	unsigned int overwrite;
	184	unsigned int bw_avg_time;
	185	unsigned int loops;
	186	unsigned long long file_size;
	187	unsigned long long real_file_size;
	188	unsigned long long file_offset;
	189	unsigned long long zone_size;
	190	unsigned long long zone_skip;
	191	enum fio_memtype mem_type;
	192	unsigned int stonewall;
	193	unsigned int numjobs;
	194	unsigned int iodepth;
	195	os_cpu_mask_t cpumask;
	196	unsigned int iolog;
	197	unsigned int read_iolog;
	198	unsigned int write_iolog;
	199	unsigned int rwmixcycle;
	200	unsigned int rwmixread;
	201	unsigned int nice;
	202
	203	char *iolog_file;
	204	void *iolog_buf;
	205	FILE *iolog_f;
	206
	207	char *sysfs_root;
	208	char *ioscheduler;
	209
	210	os_random_state_t bsrange_state;
	211	os_random_state_t verify_state;
	212
	213	int shm_id;
	214
	215	/*
	216	* IO engine hooks, contains everything needed to submit an io_u
	217	* to any of the available IO engines.
	218	*/
	219	void *io_data;
	220	char io_engine_name[16];
	221	int (io_prep)(struct thread_data , struct io_u *);
	222	int (io_queue)(struct thread_data , struct io_u *);
	223	int (io_getevents)(struct thread_data , int, int, struct timespec *);
	224	struct io_u (io_event)(struct thread_data *, int);
	225	int (io_cancel)(struct thread_data , struct io_u *);
	226	void (io_cleanup)(struct thread_data );
	227	int (io_sync)(struct thread_data );
	228
	229	/*
	230	* Current IO depth and list of free and busy io_u's.
	231	*/
	232	unsigned int cur_depth;
	233	struct list_head io_u_freelist;
	234	struct list_head io_u_busylist;
	235
	236	/*
	237	* Rate state
	238	*/
	239	unsigned int rate;
	240	unsigned int ratemin;
	241	unsigned int ratecycle;
	242	unsigned long rate_usec_cycle;
	243	long rate_pending_usleep;
	244	unsigned long rate_bytes;
	245	struct timeval lastrate;
	246
	247	unsigned long runtime[2]; /* msec */
	248	unsigned long long io_size;
	249	unsigned long long total_io_size;
	250
	251	unsigned long long io_blocks[2];
	252	unsigned long long io_bytes[2];
	253	unsigned long long zone_bytes;
	254	unsigned long long this_io_bytes[2];
	255	unsigned long long last_pos;
	256	volatile int mutex;
	257
	258	/*
	259	* State for random io, a bitmap of blocks done vs not done
	260	*/
	261	os_random_state_t random_state;
	262	unsigned long *file_map;
	263	unsigned int num_maps;
	264
	265	/*
	266	* CPU "io" cycle burner
	267	*/
	268	unsigned int cpuload;
	269	unsigned int cpucycle;
	270
	271	/*
	272	* bandwidth and latency stats
	273	*/
	274	struct io_stat clat_stat[2]; /* completion latency */
	275	struct io_stat slat_stat[2]; /* submission latency */
	276	struct io_stat bw_stat[2]; /* bandwidth stats */
	277
	278	unsigned long long stat_io_bytes[2];
	279	struct timeval stat_sample_time[2];
	280
	281	struct io_log *slat_log;
	282	struct io_log *clat_log;
	283	struct io_log *bw_log;
	284
	285	struct timeval start; /* start of this loop */
	286	struct timeval epoch; /* time job was started */
	287
	288	/*
	289	* fio system usage accounting
	290	*/
	291	struct rusage ru_start;
	292	struct rusage ru_end;
	293	unsigned long usr_time;
	294	unsigned long sys_time;
	295	unsigned long ctx;
	296
	297	/*
	298	* read/write mixed workload state
	299	*/
	300	os_random_state_t rwmix_state;
	301	struct timeval rwmix_switch;
	302	enum fio_ddir rwmix_ddir;
	303
	304	/*
	305	* Pre-run and post-run shell
	306	*/
	307	char *exec_prerun;
	308	char *exec_postrun;
	309
	310	/*
	311	* IO historic logs
	312	*/
	313	struct list_head io_hist_list;
	314	struct list_head io_log_list;
	315	};
	316
	317	#define __td_verror(td, err, msg) \
	318	do { \
	319	int e = (err); \
	320	(td)->error = e; \
	321	snprintf(td->verror, sizeof(td->verror) - 1, "file:%s:%d, error=%s", __FILE__, __LINE__, (msg)); \
	322	} while (0)
	323
	324
	325	#define td_verror(td, err) __td_verror((td), (err), strerror((err)))
	326	#define td_vmsg(td, err, msg) __td_verror((td), (err), (msg))
	327
	328	extern struct io_u __get_io_u(struct thread_data );
	329	extern void put_io_u(struct thread_data , struct io_u );
	330
	331	extern int rate_quit;
	332	extern int write_lat_log;
	333	extern int write_bw_log;
	334	extern int exitall_on_terminate;
	335	extern int thread_number;
	336	extern int shm_id;
	337	extern int groupid;
	338	extern int terse_output;
	339	extern FILE *f_out;
	340	extern FILE *f_err;
	341
	342	extern struct thread_data *threads;
	343
	344	#define td_read(td) ((td)->ddir == DDIR_READ)
	345	#define td_write(td) ((td)->ddir == DDIR_WRITE)
	346	#define td_rw(td) ((td)->iomix != 0)
	347
	348	#define BLOCKS_PER_MAP (8 * sizeof(long))
	349	#define TO_MAP_BLOCK(td, b) ((b) - ((td)->file_offset / (td)->min_bs))
	350	#define RAND_MAP_IDX(td, b) (TO_MAP_BLOCK(td, b) / BLOCKS_PER_MAP)
	351	#define RAND_MAP_BIT(td, b) (TO_MAP_BLOCK(td, b) & (BLOCKS_PER_MAP - 1))
	352
	353	#define MAX_JOBS (1024)
	354
	355	struct disk_util_stat {
	356	unsigned ios[2];
	357	unsigned merges[2];
	358	unsigned long long sectors[2];
	359	unsigned ticks[2];
	360	unsigned io_ticks;
	361	unsigned time_in_queue;
	362	};
	363
	364	struct disk_util {
	365	struct list_head list;
	366
	367	char *name;
	368	char path[256];
	369	dev_t dev;
	370
	371	struct disk_util_stat dus;
	372	struct disk_util_stat last_dus;
	373
	374	unsigned long msec;
	375	struct timeval time;
	376	};
	377
	378	struct io_completion_data {
	379	int nr; /* input */
	380
	381	int error; /* output */
	382	unsigned long bytes_done[2]; /* output */
	383	};
	384
	385	#define DISK_UTIL_MSEC (250)
	386
	387	#ifndef min
	388	#define min(a, b) ((a) < (b) ? (a) : (b))
	389	#endif
	390
	391	/*
	392	* Log exports
	393	*/
	394	extern int read_iolog_get(struct thread_data , struct io_u );
	395	extern void write_iolog_put(struct thread_data , struct io_u );
	396	extern int init_iolog(struct thread_data *td);
	397	extern void log_io_piece(struct thread_data , struct io_u );
	398	extern void prune_io_piece_log(struct thread_data *);
	399	extern void write_iolog_close(struct thread_data *);
	400
	401	/*
	402	* Logging
	403	*/
	404	extern void add_clat_sample(struct thread_data *, int, unsigned long);
	405	extern void add_slat_sample(struct thread_data *, int, unsigned long);
	406	extern void add_bw_sample(struct thread_data *, int);
	407	extern void show_run_stats(void);
	408	extern void init_disk_util(struct thread_data *);
	409	extern void update_rusage_stat(struct thread_data *);
	410	extern void update_io_ticks(void);
	411	extern void disk_util_timer_arm(void);
	412	extern void setup_log(struct io_log **);
	413	extern void finish_log(struct thread_data , struct io_log , const char *);
	414	extern int setup_rate(struct thread_data *);
	415
	416	/*
	417	* Time functions
	418	*/
	419	extern unsigned long utime_since(struct timeval , struct timeval );
	420	extern unsigned long mtime_since(struct timeval , struct timeval );
	421	extern unsigned long mtime_since_now(struct timeval *);
	422	extern unsigned long time_since_now(struct timeval *);
	423	extern void __usec_sleep(unsigned int);
	424	extern void usec_sleep(struct thread_data *, unsigned long);
	425	extern void rate_throttle(struct thread_data *, unsigned long, unsigned int);
	426
	427	/*
	428	* Init functions
	429	*/
	430	extern int parse_options(int, char **);
	431	extern int init_random_state(struct thread_data *);
	432
	433	/*
	434	* This is a pretty crappy semaphore implementation, but with the use that fio
	435	* has (just signalling start/go conditions), it doesn't have to be better.
	436	* Naturally this would not work for any type of contended semaphore or
	437	* for real locking.
	438	*/
	439	static inline void fio_sem_init(volatile int *sem, int val)
	440	{
	441	*sem = val;
	442	}
	443
	444	static inline void fio_sem_down(volatile int *sem)
	445	{
	446	while (*sem == 0)
	447	usleep(10000);
	448
	449	(*sem)--;
	450	}
	451
	452	static inline void fio_sem_up(volatile int *sem)
	453	{
	454	(*sem)++;
	455	}
	456
	457	/*
	458	* If logging output to a file, stderr should go to both stderr and f_err
	459	*/
	460	#define log_err(args...) do { \
	461	fprintf(f_err, ##args); \
	462	if (f_err != stderr) \
	463	fprintf(stderr, ##args); \
	464	} while (0)
	465
	466	#endif