arc_lat_with_ts.sh

#!/bin/bash

user_custom_limit=$1
var_def_limit='480'
var_limit=${user_custom_limit:-${var_def_limit}}
var_slow=100
output_log=/root/arc-lat-above-${var_slow}-$(date +"%Y%m%d").log
exec 1> $output_log

dtrace -qn '
inline int OPT_limit = '$var_limit';
inline int OPT_slow = '$var_slow';

BEGIN {
    slow = 0;
    cnt = 0;
    }

::arc_adjust:entry {
    self->ts = timestamp
    }

::arc_adjust:return {
    slow = 1 ? (timestamp - self->ts)/1000 > OPT_slow : 0;
    @ = max((timestamp - self->ts)/1000); self->ts = 0;
    }

tick-1sec /slow == 1 / {
    printf("%Y ", walltimestamp);
    printa("%@d\n", @); clear(@); slow = 0; 
    }

tick-60sec {
    cnt++;
    }

tick-60sec / cnt > OPT_limit / {
    exit(0);
    }'