systemtap/ioblock_delay/device.stp


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// size of array equals to max. number of pending requests
global calls[30000];

probe begin {
    printf("device,sector,time_ns\n");
}

probe ioblock.request
{
    if (devname == @1) {
        calls[$bio] = gettimeofday_ns();
    }
}

probe ioblock.end
{
   if ([$bio] in calls) {
     time = gettimeofday_ns() - calls[$bio];
     delete calls[$bio];

     printf("%s,%u,%ld\n",
            devname, sector, time);
   }
}

probe end {
  foreach ([bio] in calls) {
    printf("# Lost: %s,%u,%u\n", 
           __bio_devname(bio), @cast(bio, "bio")->bi_sector, calls[bio]);
  }
}