PID fsync histogram

fsync.bt

#!/usr/bin/bpftrace

BEGIN
{
    printf("Tracing fsync and fdatasync syscalls... Hit Ctrl-C to end.\n");
}

tracepoint:syscalls:sys_enter_fsync,
tracepoint:syscalls:sys_enter_fdatasync /pid==4320/ {
 @start[tid] = nsecs;
}

tracepoint:syscalls:sys_exit_fsync,
tracepoint:syscalls:sys_exit_fdatasync /@start[tid]/ {
    $ns=@start[tid];
    $ms=((nsecs - $ns) / 1000000);
    @lat = lhist($ms, 10, 1000, 100)
}

interval:s:10 {
  print(@lat);
}


END
{
    clear(@lat);
    clear(@start);
}