$ cat /proc/meminfo | grep -e "^Mem"
MemTotal:        8142012 kB
MemFree:         7204048 kB
MemAvailable:    7672148 kB


#!/bin/sh
while [ 1 ]; do
    sg_inq /dev/sdf
    sleep 2
done


$ sh send_sg_inq.sh


$ sudo dd if=/dev/zero of=/dev/sdf1 bs=1M


:$ sudo scsi_logging_level -g
Current scsi logging level:
/proc/sys/dev/scsi/logging_level = 0
SCSI_LOG_ERROR=0
SCSI_LOG_TIMEOUT=0
SCSI_LOG_SCAN=0
SCSI_LOG_MLQUEUE=0
SCSI_LOG_MLCOMPLETE=0
SCSI_LOG_LLQUEUE=0
SCSI_LOG_LLCOMPLETE=0
SCSI_LOG_HLQUEUE=0
SCSI_LOG_HLCOMPLETE=0
SCSI_LOG_IOCTL=0


$ sudo scsi_logging_level -s -E 7 -L 7 -M 7
New scsi logging level:
/proc/sys/dev/scsi/logging_level = 2096647
SCSI_LOG_ERROR=7
SCSI_LOG_TIMEOUT=0
SCSI_LOG_SCAN=0
SCSI_LOG_MLQUEUE=7
SCSI_LOG_MLCOMPLETE=7
SCSI_LOG_LLQUEUE=7
SCSI_LOG_LLCOMPLETE=7
SCSI_LOG_HLQUEUE=0
SCSI_LOG_HLCOMPLETE=0
SCSI_LOG_IOCTL=0


$ sudo scsi_logging_level -s -E 0 -L 0 -M 0
New scsi logging level:
/proc/sys/dev/scsi/logging_level = 7
SCSI_LOG_ERROR=7
SCSI_LOG_TIMEOUT=0
SCSI_LOG_SCAN=0
SCSI_LOG_MLQUEUE=0
SCSI_LOG_MLCOMPLETE=0
SCSI_LOG_LLQUEUE=0
SCSI_LOG_LLCOMPLETE=0
SCSI_LOG_HLQUEUE=0
SCSI_LOG_HLCOMPLETE=0
SCSI_LOG_IOCTL=0


$ tar xJf perf-5.9.0.tar.xz


$ cd perf-5.9.0/tools/perf/


$ sudo fio --bs=1K --ioengine=libaio --iodepth=32 --size=10g --direct=0 --runtime=60 --filename=/dev/sdf --rw=randread --numjobs=1 --name=test


$ sudo ./perf record -a -g -- sleep 30
[ perf record: Woken up 8 times to write data ]
[ perf record: Captured and wrote 2.476 MB perf.data (12373 samples) ]


$ sudo ./perf script > out.script
$ sudo ./perf report > out.report


$ ls out.*
out.report  out.script