disksim_disk.h

目前最精确的磁盘模拟器的第3版

  int		reqwater;
  int		sectbysect;
  int		enablecache;
  int		contread;
  int		minreadahead;
  int		maxreadahead;
  int		keeprequestdata;
  int		readaheadifidle;
  int		fastwrites;
  int		numdirty;

  // "Combine seq writes"
  int		writecomb;

  // "Stop prefetch in sector"
  int		stopinsector;

  // "Disconnect write if seek"
  int		disconnectinseek;

  // ctlr
  int		immedstart;
  int		immedend;

  // list of all the cache segments(?)
  segment      *seglist;

  // overheads -- mostly in controller code
  double	overhead_command_readhit_afterread;
  double	overhead_command_readhit_afterwrite;

  double	overhead_command_readmiss_afterread;
  double	overhead_command_readmiss_afterwrite;

  double	overhead_command_writehit_afterread;
  double	overhead_command_writehit_afterwrite;

  double	overhead_command_writemiss_afterread;
  double	overhead_command_writemiss_afterwrite;

  double	overhead_complete_read;
  double	overhead_complete_write;

  double	overhead_data_prep;
  double	overhead_reselect_first;
  double	overhead_reselect_other;

  double	overhead_disconnect_read_afterread;
  double	overhead_disconnect_read_afterwrite;

  double	overhead_disconnect_write;


  // "extra" overhead/delay/latency ... cache/ctlr
  struct diskreq_t *extradisc_diskreq;
  int		extra_write_disconnect;
  double	extradisc_command;
  double	extradisc_disconnect1;
  double	extradisc_inter_disconnect;
  double	extradisc_disconnect2;
  double	extradisc_seekdelta;

  double	minimum_seek_delay;

  // looks like more globals
  //  int		firstblkontrack;
  //  int		endoftrack;

  // passes into global_currtime, involved in global_currangle computation
  double       currtime;
  dm_time_t    currtime_i;

  // only appears in cache code -- disk_interferestats()
  int          lastgen;

  // flags on previous request to current (?)
  int	       lastflags;

  // time at which some transaction was started; only appears in 
  // controller code
  double       starttrans;

  // "Bulk sector transfer time"
  double       blktranstime;

  disk_state_t outstate;

  // cache/controller
  diskreq     *pendxfer;
  diskreq     *currenthda;
  diskreq     *effectivehda;
  diskreq     *currentbus;
  diskreq     *effectivebus;

  // number of blocks transferred for this request (?)
  // only appears in controller code
  int	       blksdone;

  int	       busowned;
  ioreq_event *buswait;
  ioreq_event *outwait;

  int          numinbuses;
  int          inbuses[MAXINBUSES];
  int          depth[MAXINBUSES];
  int          slotno[MAXINBUSES];


  diskstat     stat;
  int          printstats;


  // zero-latency parameters
  int immed;
  int immedread;
  int immedwrite;

} disk;


typedef struct disk_info {
   disk **disks;
   int disks_len; /* allocated size of disks */
   int numdisks;
   int disk_printhack;   /* disk_printhack = 0, 1, or 2 */
   double disk_printhacktime;
   int numsyncsets;
   int extra_write_disconnects;
/* From disksim_diskmap.c -- gross mechanism for returning a value */
  //   int remapsector;
/* From disksim_diskctlr.c */
   int bandstart;
   int swap_forward_only;
/* From disksim_diskmech.c */
  //   int trackstart;   /* really yucky usage */
   double addtolatency;
  //   int global_seekdistance;  /* really yucky usage */
   double disk_seek_stoptime;
   int disk_last_distance;
   double disk_last_seektime;
   double disk_last_latency;
   double disk_last_xfertime;
   double disk_last_acctime;
   int disk_last_cylno;
   int disk_last_surface;
 /* Free blocks added stats etc*/
  double disk_last_angle;
  double multi_disk_last_seektime[MAXDISKS][MAXSTATS];
  double multi_disk_last_latency[MAXDISKS][MAXSTATS];
  int multi_disk_last_cylno[MAXDISKS][MAXSTATS];
  int multi_disk_last_surface[MAXDISKS][MAXSTATS];
  double multi_disk_last_angle[MAXDISKS][MAXSTATS];
  double multi_disk_last_xfertime[MAXDISKS][MAXSTATS];
  int do_free_blocks;
  int multi_disk_last[MAXDISKS];
  disk *lastdisk;
/* From disksim_diskcache.c */
   int LRU_at_seg_list_head;
/* "globals" are used instead of locals. values may be set and passed */
/* do NOT assume these have useful values at any point in time        */
/* unless they have just been set                                     */
  //   int global_currcylno;
  //   int global_currsurface;
  //   double global_currtime;
  //   double global_currangle;
/* *ESTIMATED* command processing overheads for buffer cache hits.  These */
/* values are not actually used for determining request service times.    */
   double buffer_partial_servtime;
   double reading_buffer_partial_servtime;
   double buffer_whole_servtime;
   double reading_buffer_whole_servtime;
} disk_info_t;

/* one remapping #define for each variable in disk_info_t */
//#define disks                     (disksim->diskinfo->disks)
#define multi_disk_last_seektime  (disksim->diskinfo->multi_disk_last_seektime)
#define multi_disk_last_latency   (disksim->diskinfo->multi_disk_last_latency)
#define multi_disk_last_cylno     (disksim->diskinfo->multi_disk_last_cylno)
#define multi_disk_last_surface   (disksim->diskinfo->multi_disk_last_surface)
#define multi_disk_last_angle     (disksim->diskinfo->multi_disk_last_angle)
#define multi_disk_last_xfertime  (disksim->diskinfo->multi_disk_last_xfertime)
#define multi_disk_last           (disksim->diskinfo->multi_disk_last)
#define do_free_blocks            (disksim->diskinfo->do_free_blocks)
#define disk_last_angle           (disksim->diskinfo->disk_last_angle)
#define lastdisk                  (disksim->diskinfo->lastdisk)
#define numdisks                  (disksim->diskinfo->numdisks)
#define disk_printhack            (disksim->diskinfo->disk_printhack)
#define disk_printhacktime        (disksim->diskinfo->disk_printhacktime)
#define numsyncsets               (disksim->diskinfo->numsyncsets)
#define extra_write_disconnects   (disksim->diskinfo->extra_write_disconnects)
//#define remapsector               (disksim->diskinfo->remapsector)
#define bandstart                 (disksim->diskinfo->bandstart)
#define swap_forward_only         (disksim->diskinfo->swap_forward_only)
// #define trackstart                (disksim->diskinfo->trackstart)
#define addtolatency              (disksim->diskinfo->addtolatency)
//#define global_seekdistance       (disksim->diskinfo->global_seekdistance)
#define disk_seek_stoptime        (disksim->diskinfo->disk_seek_stoptime)
#define disk_last_distance        (disksim->diskinfo->disk_last_distance)
#define disk_last_seektime        (disksim->diskinfo->disk_last_seektime)
#define disk_last_latency         (disksim->diskinfo->disk_last_latency)
#define disk_last_xfertime        (disksim->diskinfo->disk_last_xfertime)
#define disk_last_acctime         (disksim->diskinfo->disk_last_acctime)
#define disk_last_cylno           (disksim->diskinfo->disk_last_cylno)
#define disk_last_surface         (disksim->diskinfo->disk_last_surface)
#define LRU_at_seg_list_head      (disksim->diskinfo->LRU_at_seg_list_head)
//#define global_currcylno          (disksim->diskinfo->global_currcylno)
//#define global_currsurface        (disksim->diskinfo->global_currsurface)
//#define global_currtime           (disksim->diskinfo->global_currtime)
//#define global_currangle          (disksim->diskinfo->global_currangle)
#define buffer_partial_servtime   (disksim->diskinfo->buffer_partial_servtime)
#define reading_buffer_partial_servtime (disksim->diskinfo->reading_buffer_partial_servtime)
#define buffer_whole_servtime     (disksim->diskinfo->buffer_whole_servtime)
#define reading_buffer_whole_servtime (disksim->diskinfo->reading_buffer_whole_servtime)



/* 
 * disksim_diskctlr.c functions 
 */

int  disk_buffer_stopable_access (disk *currdisk, diskreq *currdiskreq);
int  disk_enablement_function (ioreq_event *);


/* 
 * disksim_diskcache.c functions 
 */

segment * disk_buffer_select_segment(disk *currdisk, 
				     diskreq *currdiskreq, 
				     int set_extradisc);

segment * disk_buffer_recyclable_segment(disk *currdisk, int isread);
diskreq * disk_buffer_seg_owner(segment *seg, int effective);
int  disk_buffer_attempt_seg_ownership(disk *currdisk, diskreq *currdiskreq);

int  disk_buffer_get_max_readahead(disk *currdisk, 
				   segment *seg, 
				   ioreq_event *curr);

int  disk_buffer_block_available(disk *currdisk, segment *seg, int blkno);
int  disk_buffer_reusable_segment_check(disk *currdisk, segment *currseg);
int  disk_buffer_overlap(segment *seg, ioreq_event *curr);
int  disk_buffer_check_segments(disk *currdisk, 
				ioreq_event *currioreq, 
				int *buffer_reading);

void disk_buffer_set_segment(disk *currdisk, diskreq *currdiskreq);
void disk_buffer_segment_wrap(segment *seg, int endblkno);
void disk_buffer_remove_from_seg(diskreq *currdiskreq);
void disk_interferestats(disk *currdisk, ioreq_event *curr);


/* 
 * externalized disksim_disk*.c functions (should be here?) 
 */

INLINE struct disk *getdisk (int diskno);
struct disk *getdiskbyname(char *name);

void    disk_set_syncset (int setstart, int setend);

void    disk_setcallbacks(void);
void    disk_initialize(void);
void    disk_resetstats(void);
void    disk_printstats(void);
void    disk_printsetstats(int *set, int setsize, char *sourcestr);
void    disk_cleanstats(void);

int     disk_set_depth(int diskno, int inbusno, int depth, int slotno);
int     disk_get_depth(int diskno);
int     disk_get_inbus(int diskno);
INLINE int     disk_get_busno(ioreq_event *curr);
int     disk_get_slotno(int diskno);

int     disk_get_number_of_blocks(int diskno);
int     disk_get_maxoutstanding(int diskno);

int     disk_get_numdisks(void);

int     disk_get_numcyls(int diskno);
double  disk_get_blktranstime(ioreq_event *curr);
int     disk_get_avg_sectpercyl(int devno);

void    disk_get_mapping(int maptype, 
			 int diskno, 
			 int blkno, 
			 int *cylptr, 
			 int *surfaceptr, 
			 int *blkptr);

void    disk_event_arrive(ioreq_event *curr);

int     disk_get_distance(int diskno, 
			  ioreq_event *req, 
			  int exact, 
			  int direction);

double  disk_get_servtime(int diskno, 
			  ioreq_event *req, 
			  int checkcache, 
			  double maxtime);

double  disk_get_seektime(int diskno, 
			  ioreq_event *req, 
			  int checkcache, 
			  double maxtime);

double  disk_get_acctime(int diskno, 
			 ioreq_event *req, 
			 double maxtime);



void    disk_bus_delay_complete(int devno, 
				ioreq_event *curr, 
				int sentbusno);

void    disk_bus_ownership_grant(int devno, 
				 ioreq_event *curr, 
				 int busno, 
				 double arbdelay);

/* default disk dev header */
extern struct device_header disk_hdr_initializer;

int disk_load_syncsets(struct lp_block *b);


int disk_setup_mapping(struct disk *d);



#endif   /* DISKSIM_DISK_H */