linux-lustre.c

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/****************************/
/* THIS IS OPEN SOURCE CODE */
/****************************/

#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdint.h>
#include <ctype.h>

#include "papi.h"
#include "papi_internal.h"
#include "papi_vector.h"
#include "papi_memory.h"

typedef struct counter_info_struct
{
    int idx;
    char *name;
    char *description;
    char *unit;
    unsigned long long value;
} counter_info;

typedef struct
{
    int count;
    char **data;
} string_list;


typedef struct lustre_fs_struct
{
    char *proc_file;
    char *proc_file_readahead;
    counter_info *write_cntr;
    counter_info *read_cntr;
    counter_info *readahead_cntr;
    struct lustre_fs_struct *next;
} lustre_fs;

#define LUSTRE_MAX_COUNTERS 100
#define LUSTRE_MAX_COUNTER_TERMS  LUSTRE_MAX_COUNTERS

typedef counter_info LUSTRE_register_t;
typedef counter_info LUSTRE_native_event_entry_t;
typedef counter_info LUSTRE_reg_alloc_t;


typedef struct LUSTRE_control_state
{
    long long start_count[LUSTRE_MAX_COUNTERS];
        long long current_count[LUSTRE_MAX_COUNTERS];
        long long difference[LUSTRE_MAX_COUNTERS];
        int which_counter[LUSTRE_MAX_COUNTERS];
    int num_events;
} LUSTRE_control_state_t;


typedef struct LUSTRE_context
{
    LUSTRE_control_state_t state;
} LUSTRE_context_t;

/* Default path to lustre stats */
const char proc_base_path[] = "/proc/fs/lustre/";
//const char proc_base_path[] = "./components/lustre/fake_proc/fs/lustre/";

static counter_info *lustre_native_table[LUSTRE_MAX_COUNTERS];
static int num_events = 0;

/* mount Lustre fs are kept in a list */
static lustre_fs *root_lustre_fs = NULL;

papi_vector_t _lustre_vector;

/******************************************************************************
 ********  BEGIN FUNCTIONS  USED INTERNALLY SPECIFIC TO THIS COMPONENT ********
 *****************************************************************************/

static counter_info *
addCounter( const char *name, const char *desc, const char *unit )
{
    counter_info *cntr;

    cntr = malloc( sizeof ( counter_info ) );

    if ( cntr == NULL ) {
       SUBDBG("can not allocate memory for new counter\n" );
       return NULL;
    }

    cntr->idx=num_events;
    cntr->name = strdup( name );
    cntr->description = strdup( desc );
    cntr->unit = strdup( unit );
    cntr->value = 0;

    lustre_native_table[num_events]=cntr;

    num_events++;

    return cntr;
}

static int
addLustreFS( const char *name,
         const char *procpath_general, 
         const char *procpath_readahead )
{
    lustre_fs *fs, *last;
    char counter_name[512];
    FILE *fff;

    SUBDBG("Adding lustre fs\n");

    fs = malloc( sizeof ( lustre_fs ) );
    if ( fs == NULL ) {
       SUBDBG("can not allocate memory for new Lustre FS description\n" );
       return PAPI_ENOMEM;
    }

    fs->proc_file=strdup(procpath_general);
    fff = fopen( procpath_general, "r" );
    if ( fff == NULL ) {
      SUBDBG("can not open '%s'\n", procpath_general );
      free(fs);
      return PAPI_ESYS;
    }
    fclose(fff);

    fs->proc_file_readahead = strdup(procpath_readahead);
    fff = fopen( procpath_readahead, "r" );
    if ( fff == NULL ) {
      SUBDBG("can not open '%s'\n", procpath_readahead );
      free(fs);
      return PAPI_ESYS;
    }
    fclose(fff);

    sprintf( counter_name, "%s_llread", name );
    fs->read_cntr = addCounter( counter_name, 
                    "bytes read on this lustre client", 
                    "bytes" );

    sprintf( counter_name, "%s_llwrite", name );
    fs->write_cntr = addCounter( counter_name, 
                     "bytes written on this lustre client",
                     "bytes" );

    sprintf( counter_name, "%s_wrong_readahead", name );
    fs->readahead_cntr = addCounter( counter_name, 
                     "bytes read but discarded due to readahead",
                     "bytes" );

    fs->next = NULL;

    /* Insert into the linked list */
    /* Does this need locking? */
    if ( root_lustre_fs == NULL ) {
        root_lustre_fs = fs;
    } else {
        last = root_lustre_fs;

        while ( last->next != NULL )
            last = last->next;

        last->next = fs;
    }
    free(fs);
    return PAPI_OK;
}


static int
init_lustre_counters( void  )
{
        char lustre_dir[PATH_MAX];
    char path[PATH_MAX];
    char path_readahead[PATH_MAX],path_stats[PATH_MAX];
    char *ptr;
    char fs_name[100];
    int idx = 0;
    int tmp_fd;
    DIR *proc_dir;
    struct dirent *entry;

    sprintf(lustre_dir,"%s/llite",proc_base_path);

    proc_dir = opendir( lustre_dir );
    if ( proc_dir == NULL ) {
       SUBDBG("Cannot open %s\n",lustre_dir);
       return PAPI_ESYS;
    }

    entry = readdir( proc_dir );

    while ( entry != NULL ) {
       memset( path, 0, PATH_MAX );
       snprintf( path, PATH_MAX - 1, "%s/%s/stats", lustre_dir,
                  entry->d_name );
       SUBDBG("checking for file %s\n", path);

       if ( ( tmp_fd = open( path, O_RDONLY ) ) != -1 ) {
          close( tmp_fd );

          /* erase \r and \n at the end of path */
          /* why is this necessary?             */

          idx = strlen( path );
          idx--;

          while ( path[idx] == '\r' || path[idx] == '\n' )
            path[idx--] = 0;

          /* Lustre paths are of type server-UUID */

          idx = 0;

          ptr = strstr(path,"llite/") + 6;

          while ( *ptr && *ptr != '-' && idx < 100 ) {
             fs_name[idx] = *ptr;
         ptr++;
         idx++;
          }

          SUBDBG("found Lustre FS: %s\n", fs_name);

          snprintf( path_stats, PATH_MAX - 1, 
            "%s/%s/stats", 
            lustre_dir,
            entry->d_name );
          SUBDBG("Found file %s\n", path_stats);

          snprintf( path_readahead, PATH_MAX - 1, 
            "%s/%s/read_ahead_stats", 
            lustre_dir,
            entry->d_name );
          SUBDBG("Now checking for file %s\n", path_readahead);


          strcpy( ptr, "read_ahead_stats" );
          addLustreFS( fs_name, path_stats, path_readahead );

       }
       entry = readdir( proc_dir );
    }
    closedir( proc_dir );

    return PAPI_OK;

}

static void
read_lustre_counter( )
{
    lustre_fs *fs = root_lustre_fs;
    FILE *fff;
    char buffer[BUFSIZ];

    while ( fs != NULL ) {

      /* read values from stats file */
      fff=fopen(fs->proc_file,"r" );
      if (fff != NULL) {
          while(1) {
            if (fgets(buffer,BUFSIZ,fff)==NULL) break;
    
            if (strstr( buffer, "write_bytes" )) {
              sscanf(buffer,"%*s %*d %*s %*s %*d %*d %lld",&fs->write_cntr->value);
              SUBDBG("Read %lld write_bytes\n",fs->write_cntr->value);
            }
    
            if (strstr( buffer, "read_bytes" )) {
              sscanf(buffer,"%*s %*d %*s %*s %*d %*d %lld",&fs->read_cntr->value);
              SUBDBG("Read %lld read_bytes\n",fs->read_cntr->value);
            }
          }
          fclose(fff);
      }

      fff=fopen(fs->proc_file_readahead,"r");
      if (fff != NULL) {
          while(1) {
            if (fgets(buffer,BUFSIZ,fff)==NULL) break;
    
            if (strstr( buffer, "read but discarded")) {
               sscanf(buffer,"%*s %*s %*s %lld",&fs->readahead_cntr->value);
               SUBDBG("Read %lld discared\n",fs->readahead_cntr->value);
               break;
            }
          }
          fclose(fff);
      }
      fs = fs->next;
    }
}


static void
host_finalize( void )
{
        int i;
    lustre_fs *fs, *next_fs;
    counter_info *cntr;

    for(i=0;i<num_events;i++) {
       cntr=lustre_native_table[i];
       if ( cntr != NULL ) {
          free( cntr->name );
          free( cntr->description );
          free( cntr->unit );
          free( cntr );       
       }
       lustre_native_table[i]=NULL;
    }

    fs = root_lustre_fs;

    while ( fs != NULL ) {
        next_fs = fs->next;
        free(fs->proc_file);
        free(fs->proc_file_readahead);
        free( fs );
        fs = next_fs;
    }

    root_lustre_fs = NULL;
}


static int
detect_lustre()
{
        char lustre_directory[BUFSIZ];
    DIR *proc_dir;

    sprintf(lustre_directory,"%s/llite",proc_base_path);

    proc_dir = opendir( proc_base_path );
    if ( proc_dir == NULL ) {
      SUBDBG("we are not able to read %s\n",lustre_directory);
       return PAPI_ESYS;
    }

    closedir(proc_dir);

    return PAPI_OK;
}


/*****************************************************************************
 *******************  BEGIN PAPI's COMPONENT REQUIRED FUNCTIONS  *************
 *****************************************************************************/

/*
 * Component setup and shutdown
 */

int
_lustre_init_component(  )
{

    int ret = PAPI_OK;

    /* See if lustre filesystem exists */
    ret=detect_lustre();
    if (ret!=PAPI_OK) {
       strncpy(_lustre_vector.cmp_info.disabled_reason,
           "No lustre filesystems found",PAPI_MAX_STR_LEN);
       return ret;
    }

    ret=init_lustre_counters();

    _lustre_vector.cmp_info.num_native_events=num_events;

    return ret;
}





/*
 * This is called whenever a thread is initialized
 */
int
_lustre_init_thread( hwd_context_t * ctx )
{
  (void) ctx;

  return PAPI_OK;
}


/*
 *
 */
int
_lustre_shutdown_component( void )
{

    host_finalize(  );

    return PAPI_OK;
}

/*
 *
 */
int
_lustre_shutdown_thread( hwd_context_t * ctx )
{
    ( void ) ctx;

    return PAPI_OK;
}



/*
 * Control of counters (Reading/Writing/Starting/Stopping/Setup) functions
 */
int
_lustre_init_control_state( hwd_control_state_t *ctl )
{
    LUSTRE_control_state_t *lustre_ctl = (LUSTRE_control_state_t *)ctl;

    memset(lustre_ctl->start_count,0,sizeof(long long)*LUSTRE_MAX_COUNTERS);
    memset(lustre_ctl->current_count,0,sizeof(long long)*LUSTRE_MAX_COUNTERS);

    return PAPI_OK;
}


/*
 *
 */
int
_lustre_update_control_state( hwd_control_state_t *ctl, 
                  NativeInfo_t *native,
                  int count, 
                  hwd_context_t *ctx )
{
    LUSTRE_control_state_t *lustre_ctl = (LUSTRE_control_state_t *)ctl;
    ( void ) ctx;
    int i, index;

    for ( i = 0; i < count; i++ ) {
       index = native[i].ni_event;
       lustre_ctl->which_counter[i]=index;
       native[i].ni_position = i;
    }

    lustre_ctl->num_events=count;

    return PAPI_OK;
}


/*
 *
 */
int
_lustre_start( hwd_context_t *ctx, hwd_control_state_t *ctl )
{
    ( void ) ctx;

    LUSTRE_control_state_t *lustre_ctl = (LUSTRE_control_state_t *)ctl;
    int i;

    read_lustre_counter(  );

    for(i=0;i<lustre_ctl->num_events;i++) {
       lustre_ctl->current_count[i]=
                 lustre_native_table[lustre_ctl->which_counter[i]]->value;
    }

    memcpy( lustre_ctl->start_count,
        lustre_ctl->current_count,
        LUSTRE_MAX_COUNTERS * sizeof ( long long ) );

    return PAPI_OK;
}


/*
 *
 */
int
_lustre_stop( hwd_context_t *ctx, hwd_control_state_t *ctl )
{

    (void) ctx;
    LUSTRE_control_state_t *lustre_ctl = (LUSTRE_control_state_t *)ctl;
    int i;

    read_lustre_counter(  );

    for(i=0;i<lustre_ctl->num_events;i++) {
       lustre_ctl->current_count[i]=
                 lustre_native_table[lustre_ctl->which_counter[i]]->value;
    }

    return PAPI_OK;

}



/*
 *
 */
int
_lustre_read( hwd_context_t *ctx, hwd_control_state_t *ctl,
             long long **events, int flags )
{
    (void) ctx;
    ( void ) flags;

    LUSTRE_control_state_t *lustre_ctl = (LUSTRE_control_state_t *)ctl;
    int i;

    read_lustre_counter(  );

    for(i=0;i<lustre_ctl->num_events;i++) {
       lustre_ctl->current_count[i]=
                 lustre_native_table[lustre_ctl->which_counter[i]]->value;
       lustre_ctl->difference[i]=lustre_ctl->current_count[i]-
                                         lustre_ctl->start_count[i];
    }

    *events = lustre_ctl->difference;

    return PAPI_OK;

}




/*
 *
 */
int
_lustre_reset( hwd_context_t * ctx, hwd_control_state_t * ctrl )
{

  /* re-initializes counter_start values to current */

  _lustre_start(ctx,ctrl);

  return PAPI_OK;
}


/*
 *
 */
int
_lustre_write( hwd_context_t * ctx, hwd_control_state_t * ctrl, long long *from )
{
    ( void ) ctx;
    ( void ) ctrl;
    ( void ) from;

    return PAPI_OK;
}


/*
 * Functions for setting up various options
 */

/* This function sets various options in the component
 * The valid codes being passed in are PAPI_SET_DEFDOM,
 * PAPI_SET_DOMAIN, PAPI_SETDEFGRN, PAPI_SET_GRANUL * and PAPI_SET_INHERIT
 */
int
_lustre_ctl( hwd_context_t * ctx, int code, _papi_int_option_t * option )
{
    ( void ) ctx;
    ( void ) code;
    ( void ) option;

    return PAPI_OK;
}


/*
 * This function has to set the bits needed to count different domains
 * In particular: PAPI_DOM_USER, PAPI_DOM_KERNEL PAPI_DOM_OTHER
 * By default return PAPI_EINVAL if none of those are specified
 * and PAPI_OK with success
 * PAPI_DOM_USER is only user context is counted
 * PAPI_DOM_KERNEL is only the Kernel/OS context is counted
 * PAPI_DOM_OTHER  is Exception/transient mode (like user TLB misses)
 * PAPI_DOM_ALL   is all of the domains
 */
int
_lustre_set_domain( hwd_control_state_t * cntrl, int domain )
{
    ( void ) cntrl;
    int found = 0;
    if ( PAPI_DOM_USER & domain ) {
        found = 1;
    }
    if ( PAPI_DOM_KERNEL & domain ) {
        found = 1;
    }
    if ( PAPI_DOM_OTHER & domain ) {
        found = 1;
    }
    if ( !found )
        return PAPI_EINVAL;

    return PAPI_OK;
}


/*
 *
 */
int
_lustre_ntv_code_to_name( unsigned int EventCode, char *name, int len )
{

  int event=EventCode;

  if (event >=0 && event < num_events) {
     strncpy( name, lustre_native_table[event]->name, len );
     return PAPI_OK;
  }
  return PAPI_ENOEVNT;
}


/*
 *
 */
int
_lustre_ntv_code_to_descr( unsigned int EventCode, char *name, int len )
{

  int event=EventCode;

  if (event >=0 && event < num_events) {
    strncpy( name, lustre_native_table[event]->description, len );
    return PAPI_OK;
  }
  return PAPI_ENOEVNT;
}


/*
 *
 */
int
_lustre_ntv_enum_events( unsigned int *EventCode, int modifier )
{

    if ( modifier == PAPI_ENUM_FIRST ) {
       if (num_events==0) return PAPI_ENOEVNT;
       *EventCode = 0;
       return PAPI_OK;
    }

    if ( modifier == PAPI_ENUM_EVENTS ) {
        int index = *EventCode;

        if ( lustre_native_table[index + 1] ) {
            *EventCode = *EventCode + 1;
            return PAPI_OK;
        } else {
            return PAPI_ENOEVNT;
        }
    } 
        

    return PAPI_EINVAL;
}


/*
 *
 */
papi_vector_t _lustre_vector = {
   .cmp_info = {
        /* component information (unspecified values initialized to 0) */
       .name = "lustre",
       .short_name = "lustre",
       .version = "1.9",
       .description = "Lustre filesystem statistics",
       .num_mpx_cntrs = LUSTRE_MAX_COUNTERS,
       .num_cntrs = LUSTRE_MAX_COUNTERS,
       .default_domain = PAPI_DOM_USER,
       .default_granularity = PAPI_GRN_THR,
       .available_granularities = PAPI_GRN_THR,
       .hardware_intr_sig = PAPI_INT_SIGNAL,

       /* component specific cmp_info initializations */
       .fast_real_timer = 0,
       .fast_virtual_timer = 0,
       .attach = 0,
       .attach_must_ptrace = 0,
       .available_domains = PAPI_DOM_USER | PAPI_DOM_KERNEL,
  },

     /* sizes of framework-opaque component-private structures */
  .size = {
       .context = sizeof ( LUSTRE_context_t ),
       .control_state = sizeof ( LUSTRE_control_state_t ),
       .reg_value = sizeof ( LUSTRE_register_t ),
       .reg_alloc = sizeof ( LUSTRE_reg_alloc_t ),
  },

     /* function pointers in this component */
  .init_thread =           _lustre_init_thread,
  .init_component =        _lustre_init_component,
  .init_control_state =    _lustre_init_control_state,
  .start =                 _lustre_start,
  .stop =                  _lustre_stop,
  .read =                  _lustre_read,
  .shutdown_thread =       _lustre_shutdown_thread,
  .shutdown_component =    _lustre_shutdown_component,
  .ctl =                   _lustre_ctl,
  .update_control_state =  _lustre_update_control_state,
  .set_domain =            _lustre_set_domain,
  .reset =                 _lustre_reset,

  .ntv_enum_events =   _lustre_ntv_enum_events,
  .ntv_code_to_name =  _lustre_ntv_code_to_name,
  .ntv_code_to_descr = _lustre_ntv_code_to_descr,

};