[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,
};

/*
 * 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;
	volatile int old_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 int bs;
	unsigned int min_bs;
	unsigned int max_bs;
	unsigned int thinktime;
	unsigned int fsync_blocks;
	unsigned int start_delay;
	unsigned int 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 jobnum;
	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;

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

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 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(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 volatile *sem, int val)
{
	*sem = val;
}

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

	(*sem)--;
}

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

#endif
Commit	Line	Data
ebac4655 JA	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>
3c39a379 JA	9	#include <errno.h>
	10	#include <stdlib.h>
	11	#include <stdio.h>
6d6f031f	12	#include <unistd.h>
ebac4655 JA	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;
aea47d44	44	int ddir;
ebac4655 JA	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;
b1ff3403	68	unsigned int index;
ebac4655 JA	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 {
9104f874 JA	98	unsigned long long max_run[2], min_run[2];
9104f874 JA	99	unsigned long long max_bw[2], min_bw[2];
e9b2a3fa	100	unsigned long long io_kb[2];
9104f874	101	unsigned long long agg[2];
ebac4655 JA	102	};
ebac4655 JA	103
e9c047a0 JA	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	};
	135
	136	/*
	137	* This describes a single thread/process executing a fio job.
	138	*/
ebac4655	139	struct thread_data {
e9c047a0 JA	140	char name[32];
e9c047a0 JA	141	char *file_name;
ef899b63	142	char *directory;
ebac4655 JA	143	char verror[80];
	144	pthread_t thread;
	145	int thread_number;
	146	int groupid;
e9c047a0	147	enum fio_filetype filetype;
ebac4655 JA	148	int error;
	149	int fd;
	150	void *mmap;
	151	pid_t pid;
	152	char *orig_buffer;
	153	size_t orig_buffer_size;
	154	volatile int terminate;
	155	volatile int runstate;
	156	volatile int old_runstate;
e9c047a0	157	enum fio_ddir ddir;
3d60d1ed	158	unsigned int iomix;
ebac4655	159	unsigned int ioprio;
e9c047a0 JA	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
ebac4655 JA	174	unsigned int bs;
	175	unsigned int min_bs;
	176	unsigned int max_bs;
ebac4655 JA	177	unsigned int thinktime;
	178	unsigned int fsync_blocks;
	179	unsigned int start_delay;
	180	unsigned int timeout;
e9c047a0	181	enum fio_iotype io_engine;
ebac4655	182	unsigned int overwrite;
ebac4655	183	unsigned int bw_avg_time;
ebac4655 JA	184	unsigned int loops;
ebac4655 JA	185	unsigned long long file_size;
838a3cd3	186	unsigned long long real_file_size;
ebac4655	187	unsigned long long file_offset;
20dc95c4 JA	188	unsigned long long zone_size;
20dc95c4 JA	189	unsigned long long zone_skip;
e9c047a0	190	enum fio_memtype mem_type;
ebac4655 JA	191	unsigned int stonewall;
ebac4655 JA	192	unsigned int numjobs;
ebac4655 JA	193	unsigned int iodepth;
ebac4655 JA	194	os_cpu_mask_t cpumask;
eba09dd3	195	unsigned int jobnum;
aea47d44	196	unsigned int iolog;
843a7413 JA	197	unsigned int read_iolog;
843a7413 JA	198	unsigned int write_iolog;
a6ccc7be JA	199	unsigned int rwmixcycle;
a6ccc7be JA	200	unsigned int rwmixread;
b6f4d880	201	unsigned int nice;
aea47d44	202
ef899b63	203	char *iolog_file;
843a7413 JA	204	void *iolog_buf;
843a7413 JA	205	FILE *iolog_f;
ebac4655	206
da86774e	207	char *sysfs_root;
da86774e JA	208	char *ioscheduler;
da86774e JA	209
6dfd46b9 JA	210	os_random_state_t bsrange_state;
6dfd46b9 JA	211	os_random_state_t verify_state;
ebac4655 JA	212
	213	int shm_id;
	214
e9c047a0 JA	215	/*
	216	* IO engine hooks, contains everything needed to submit an io_u
	217	* to any of the available IO engines.
	218	*/
ebac4655 JA	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
e9c047a0 JA	229	/*
	230	* Current IO depth and list of free and busy io_u's.
	231	*/
ebac4655 JA	232	unsigned int cur_depth;
	233	struct list_head io_u_freelist;
	234	struct list_head io_u_busylist;
	235
e9c047a0 JA	236	/*
	237	* Rate state
	238	*/
ebac4655 JA	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
9104f874 JA	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];
20dc95c4	255	unsigned long long last_pos;
bbfd6b00	256	volatile int mutex;
ebac4655	257
e9c047a0 JA	258	/*
	259	* State for random io, a bitmap of blocks done vs not done
	260	*/
6dfd46b9	261	os_random_state_t random_state;
ebac4655 JA	262	unsigned long *file_map;
	263	unsigned int num_maps;
	264
	265	/*
	266	* bandwidth and latency stats
	267	*/
	268	struct io_stat clat_stat[2]; /* completion latency */
	269	struct io_stat slat_stat[2]; /* submission latency */
	270	struct io_stat bw_stat[2]; /* bandwidth stats */
	271
9104f874	272	unsigned long long stat_io_bytes[2];
ebac4655 JA	273	struct timeval stat_sample_time[2];
	274
	275	struct io_log *slat_log;
	276	struct io_log *clat_log;
	277	struct io_log *bw_log;
	278
	279	struct timeval start; /* start of this loop */
	280	struct timeval epoch; /* time job was started */
	281
e9c047a0 JA	282	/*
	283	* fio system usage accounting
	284	*/
ebac4655 JA	285	struct rusage ru_start;
	286	struct rusage ru_end;
	287	unsigned long usr_time;
	288	unsigned long sys_time;
	289	unsigned long ctx;
	290
e9c047a0 JA	291	/*
	292	* read/write mixed workload state
	293	*/
6dfd46b9	294	os_random_state_t rwmix_state;
a6ccc7be	295	struct timeval rwmix_switch;
e9c047a0	296	enum fio_ddir rwmix_ddir;
a6ccc7be	297
4e0ba8af JA	298	/*
	299	* Pre-run and post-run shell
	300	*/
	301	char *exec_prerun;
	302	char *exec_postrun;
	303
e9c047a0 JA	304	/*
	305	* IO historic logs
	306	*/
ebac4655	307	struct list_head io_hist_list;
aea47d44	308	struct list_head io_log_list;
ebac4655 JA	309	};
	310
	311	#define td_verror(td, err) \
	312	do { \
	313	int e = (err); \
	314	(td)->error = e; \
	315	snprintf(td->verror, sizeof(td->verror) - 1, "file:%s:%d, error=%s", __FILE__, __LINE__, strerror(e)); \
	316	} while (0)
	317
b1ff3403 JA	318	extern struct io_u __get_io_u(struct thread_data );
b1ff3403 JA	319	extern void put_io_u(struct thread_data , struct io_u );
ebac4655 JA	320
	321	extern int rate_quit;
	322	extern int write_lat_log;
	323	extern int write_bw_log;
	324	extern int exitall_on_terminate;
	325	extern int thread_number;
	326	extern int shm_id;
	327	extern int groupid;
	328
	329	extern struct thread_data *threads;
	330
ebac4655 JA	331	#define td_read(td) ((td)->ddir == DDIR_READ)
ebac4655 JA	332	#define td_write(td) ((td)->ddir == DDIR_WRITE)
3d60d1ed	333	#define td_rw(td) ((td)->iomix != 0)
ebac4655 JA	334
	335	#define BLOCKS_PER_MAP (8 * sizeof(long))
	336	#define TO_MAP_BLOCK(td, b) ((b) - ((td)->file_offset / (td)->min_bs))
	337	#define RAND_MAP_IDX(td, b) (TO_MAP_BLOCK(td, b) / BLOCKS_PER_MAP)
	338	#define RAND_MAP_BIT(td, b) (TO_MAP_BLOCK(td, b) & (BLOCKS_PER_MAP - 1))
	339
	340	#define MAX_JOBS (1024)
	341
	342	struct disk_util_stat {
	343	unsigned ios[2];
	344	unsigned merges[2];
	345	unsigned long long sectors[2];
	346	unsigned ticks[2];
	347	unsigned io_ticks;
	348	unsigned time_in_queue;
	349	};
	350
	351	struct disk_util {
	352	struct list_head list;
	353
	354	char *name;
	355	char path[256];
	356	dev_t dev;
	357
	358	struct disk_util_stat dus;
	359	struct disk_util_stat last_dus;
	360
	361	unsigned long msec;
	362	struct timeval time;
	363	};
	364
	365	struct io_completion_data {
	366	int nr; /* input */
	367
	368	int error; /* output */
	369	unsigned long bytes_done[2]; /* output */
	370	};
	371
	372	#define DISK_UTIL_MSEC (250)
	373
6a0106a0 JA	374	#ifndef min
	375	#define min(a, b) ((a) < (b) ? (a) : (b))
	376	#endif
	377
6796209a JA	378	/*
	379	* Log exports
	380	*/
	381	extern int read_iolog_get(struct thread_data , struct io_u );
	382	extern void write_iolog_put(struct thread_data , struct io_u );
	383	extern int init_iolog(struct thread_data *td);
	384	extern void log_io_piece(struct thread_data , struct io_u );
	385	extern void prune_io_piece_log(struct thread_data *);
	386	extern void write_iolog_close(struct thread_data *);
	387
	388	/*
	389	* Logging
	390	*/
	391	extern void add_clat_sample(struct thread_data *, int, unsigned long);
	392	extern void add_slat_sample(struct thread_data *, int, unsigned long);
	393	extern void add_bw_sample(struct thread_data *, int);
	394	extern void show_run_stats(void);
	395	extern void init_disk_util(struct thread_data *);
	396	extern void update_rusage_stat(struct thread_data *);
	397	extern void update_io_ticks(void);
	398	extern void disk_util_timer_arm(void);
8914a9d8 JA	399	extern void setup_log(struct io_log **);
	400	extern void finish_log(struct thread_data , struct io_log , const char *);
	401	extern int setup_rate(struct thread_data *);
6796209a JA	402
	403	/*
	404	* Time functions
	405	*/
	406	extern unsigned long utime_since(struct timeval , struct timeval );
	407	extern unsigned long mtime_since(struct timeval , struct timeval );
	408	extern unsigned long mtime_since_now(struct timeval *);
	409	extern unsigned long time_since_now(struct timeval *);
	410	extern void usec_sleep(struct thread_data *, unsigned long);
	411	extern void rate_throttle(struct thread_data *, unsigned long, unsigned int);
	412
8914a9d8 JA	413	/*
	414	* Init functions
	415	*/
	416	extern int parse_options(int, char **);
	417	extern int init_random_state(struct thread_data *);
	418
bbfd6b00 JA	419	/*
	420	* This is a pretty crappy semaphore implementation, but with the use that fio
	421	* has (just signalling start/go conditions), it doesn't have to be better.
	422	* Naturally this would not work for any type of contended semaphore or
	423	* for real locking.
	424	*/
	425	static inline void fio_sem_init(volatile int volatile *sem, int val)
	426	{
	427	*sem = val;
	428	}
	429
	430	static inline void fio_sem_down(volatile int volatile *sem)
	431	{
	432	while (*sem == 0)
	433	usleep(10000);
	434
	435	(*sem)--;
	436	}
	437
	438	static inline void fio_sem_up(volatile int volatile *sem)
	439	{
	440	(*sem)++;
	441	}
	442
ebac4655	443	#endif