Date: Wed, 3 Aug 2016 10:00:33 +0800 From: "Nan Xiao" <nan@chinadtrace.org> To: freebsd-questions <freebsd-questions@freebsd.org> Subject: A question about using "vmstat" to get the memory use info of kernel Message-ID: <2016080310003073760416@chinadtrace.org>
index | next in thread | raw e-mail
Hi all,
My FreeBSD is installed on VMWare Virtual Machine of my desktop, and the version is as follows:
# uname -a
FreeBSD FreeBSD 10.3-RELEASE-p5 FreeBSD 10.3-RELEASE-p5 #0: Tue Jul 19 17:52:57 CST 2016 root@FreeBSD:/usr/obj/usr/src/sys/NAN_FIRST_BUILD amd64
I have installed a "hello" driver, and use "vmstat" command to check its buffer info:
# vmstat -m | head -n 1 && vmstat -m | grep "hello"
Type InUse MemUse HighUse Requests Size(s)
hello_buffer 1 1K - 1 256
# vmstat -m | head -n 1 && vmstat -m | grep "hello"
Type InUse MemUse HighUse Requests Size(s)
hello_buffer 1 1K - 1 256
# vmstat -m | head -n 1 && vmstat -m | grep "hello"
Type InUse MemUse HighUse Requests Size(s)
# vmstat -m | head -n 1 && vmstat -m | grep "hello"
Type InUse MemUse HighUse Requests Size(s)
hello_buffer 1 1K - 1 256
I execute "vmstat -m | head -n 1 && vmstat -m | grep "hello"" command 4 times continuously, but the outputs are different. I am sure the "hello" module
is idle during the time. Why does the command output differently?
Thanks very much in advance!
Best Regards
Nan Xiao (肖楠)
Skype: xiaonan19830818
Jabber/XMPP: nanxiao@xmpp.ru.net
Telegram: nanxiao
Personal website (Chinese): http://nanxiao.me/
Personal website (English): http://nanxiao.me/en
Chinese DTrace website: http://chinadtrace.org/
help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?2016080310003073760416>