Re: cvs commit: src/sys/kern subr_smp.c
On 24-Dec-2003 Alfred Perlstein wrote:
> * John Baldwin <jhb_at_FreeBSD.org> [031223 09:04] wrote:
>> On 23-Dec-2003 Alfred Perlstein wrote:
>> > alfred 2003/12/23 05:54:16 PST
>> > FreeBSD src repository
>> > Modified files:
>> > sys/kern subr_smp.c
>> > Log:
>> > Introduce mp_maxcpus which can be used by libkvm utils to find out
>> > how many CPUs the system was compiled for.
>> > Export the variable via a sysctl node 'kern.smp.maxcpus' as well.
>> Why does libkvm care about more than mp_maxid?
> See mbuf.c from netstat(1). basically some arrays in the kernel
> are based on MAXCPU so it has to know how much to copy.
It only needs to copy up to mp_maxid though. All the rest after
that are just garbage anyways and you merely waste time by copying
that. I guess if you have a structure containing multiple arrays
then that would need maxcpu. If the arrays are standalone you don't
need it though.
John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
Received on Wed Dec 24 2003 - 08:12:16 UTC