Date: Fri, 29 Mar 2002 11:26:44 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Russell Francis <frussell@p1.cs.ohiou.edu> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: determining context switching? Message-ID: <20020329172644.GD7197@dan.emsphone.com> In-Reply-To: <Pine.GSO.3.96.1020329082538.25172A-100000@p2> References: <Pine.GSO.3.96.1020329082538.25172A-100000@p2>
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In the last episode (Mar 29), Russell Francis said:
> I was wondering if there is a way to determine the context switching
> rate?
>
> In /usr/include/sys/vmmeter.h the structure
>
> struct vmmeter {
> u_int v_swtch; /* context switches */
> ...
> }
>
> looks like what I want but I can't find a function which returns this
> data to a user land application. Is this possible? If so how?
Take a look at /usr/src/usr.sbin/vmstat.c. You'll want to use sysctl()
to pull the vm.vmmeter data block, which is of type "struct vmmeter".
--
Dan Nelson
dnelson@allantgroup.com
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