Date: Sat, 21 May 2005 16:03:08 +0300 (EEST) From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: shiner chen <shiner_chen@yahoo.com.cn> Cc: freebsd-hackers@freebsd.org Subject: Re: how to get the status of cpu in kernel? Message-ID: <20050521160013.V18522@gothmog> In-Reply-To: <20050521104937.70622.qmail@web15509.mail.cnb.yahoo.com> References: <20050521104937.70622.qmail@web15509.mail.cnb.yahoo.com>
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On 2005-05-21 18:49, shiner chen wrote: > In order to implement a dispacthing policy I want to get the status of > cpu. I have read the code of top command and i find it get the status > of cpu by the function : > > int sysctlbyname(const char *, void *, size_t *, void *, size_t); > > I search the code of kernel ,then I consider that i can get the status > of cpu through the funciton: > > int kernel_sysctlbyname(struct thread *td, char *name, void *old, > size_t *oldlenp, void *new, size_t newlen, size_t *retval); > > I try to get the status of cpu by that function ,but it does not work! You're looking at the wrong place. There is a manpage for the sysctlbyname() function, which you obviously missed. > who can tell me the problem? Nobody until you show us the source, I guess :-) > How do i get the status of cpu? > How do i use it if the funcion is right? what's the mean of the > function's arguments ? Start by reading the manpage of sysctlbyname(). Then, if you still have problems, you can post the source online somewhere and point us people at the URL.
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