From owner-freebsd-hackers  Fri Dec 17 11:41:28 1999
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Date: Fri, 17 Dec 1999 11:41:15 -0800
From: Arun Sharma <adsharma@c62443-a.frmt1.sfba.home.com>
Message-Id: <199912171941.LAA25185@c62443-a.frmt1.sfba.home.com>
To: hackers@freebsd.org
Subject: Re: Per CPU timekeeping for SMP
In-Reply-To: <19991205222423.A1391@sharmas.dhs.org>
References: <19991205222423.A1391@sharmas.dhs.org>
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Arun Sharma wrote:
> 
> 
> Here's a reimplementation of my earlier per cpu time keeping patch
> on SMP.  The attached patch is against a 11/20/99 -current that I
> cvsup'ed.

Did anyone get a chance to review this ? Is everyone busy or sending
patches to -hackers is frowned upon ? Or is this something that 
people aren't so excited about ?

<snip>
> 4. I've gotten sysctls working for sys_time -
> 
> $ sysctl -A | grep kern.stats
> kern.stats.systime.user: 25150
> kern.stats.systime.nice: 3878
> kern.stats.systime.sys: 14071
> kern.stats.systime.intr: 7395
> kern.stats.systime.idle: 5326029
> 
> I'm working on generating the per cpu sysctls. 

I've completed this work now. Here's the output of the new sysctl on
my dual cpu box:

$ sysctl -A | grep kern.stats
kern.stats.systime.user: 13710
kern.stats.systime.nice: 552
kern.stats.systime.sys: 4296
kern.stats.systime.intr: 2602
kern.stats.systime.idle: 1878764
kern.stats.cpu.user.0: 7082
kern.stats.cpu.user.1: 7169
kern.stats.cpu.nice.0: 9
kern.stats.cpu.nice.1: 2
kern.stats.cpu.sys.0: 2120
kern.stats.cpu.sys.1: 2177
kern.stats.cpu.intr.0: 1309
kern.stats.cpu.intr.1: 1293
kern.stats.cpu.idle.0: 939407
kern.stats.cpu.idle.1: 939358

I have also figured out how to dynamically register sysctl nodes.
The trick is to basically malloc a sysctl_oid and fill in the right
fields and calling sysctl_register_oid. The code is in a kernel
module available from:

http://sharmas.dhs.org/~adsharma/projects/freebsd/sysctl.tar.gz

It really needs to go into the base kernel. Also, I think
sysctl_register_long and its yet to be written friends (register_int)
etc, need to go into kern_sysctl - so that others can reuse the code
to dynamically create sysctl nodes.

I really don't want to spend my time on getting xosview and ktop to
use these patches until I'm convinced that this code is going into
the kernel.

Again, the patches may not be perfect. But if people can review it
I'll fix any issues. Also, Alpha guys need to make minor changes
to keep things working.

	-Arun



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