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Date: Wed, 5 Feb 2003 23:40:08 -0800 (PST)
Message-Id: <200302060740.h167e8oR095588@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
Cc: 
From: Arun Sharma <arun@sharma-home.net>
Subject: Re: kern/18524: The current kernel doesn't keep stats on a per cpu
 basis
Reply-To: Arun Sharma <arun@sharma-home.net>
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The following reply was made to PR kern/18524; it has been noted by GNATS.

From: Arun Sharma <arun@sharma-home.net>
To: freebsd-gnats-submit@FreeBSD.org
Cc: smp@freebsd.org
Subject: Re: kern/18524: The current kernel doesn't keep stats on a per cpu
 basis
Date: Wed, 05 Feb 2003 23:33:14 -0800

 I'd like to reopen this PR:
 
 http://www.freebsd.org/cgi/query-pr.cgi?pr=18524
 
 and submit a new patch:
 
 http://www.sharma-home.net/~adsharma/misc/pcpu-cptime.patch
 
 $ sysctl kern.smp.cpu kern.cp_time
 kern.smp.cpu.0.cp_time: 1196 1 2900 351 74120
 kern.smp.cpu.1.cp_time: 1248 3 2837 329 74110
 kern.cp_time: 2444 4 5737 680 148230
 
 The ugliest part of this patch is calling mi_cpu_start(cpu). I tried 
 making the calls in i386/mp_machdep.c, but ran into panics no matter 
 where I placed the call (mi_cpu_start ends up calling malloc, which may 
 block, do TLB shoot downs etc).
 
 So if someone has a better idea about how to arrange for a machine 
 independent cpu start/stop hook that could make blocking calls, I'd like 
 to hear about it.
 
 	-Arun
 

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