Date: Fri, 14 Apr 2006 10:17:29 -0400 From: John Baldwin <jhb@freebsd.org> To: Marco van Tol <marco@tols.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Per CPU cpu-statistics under SMP Message-ID: <200604141017.30635.jhb@freebsd.org> In-Reply-To: <20060414103810.GA18114@tols.org> References: <20060412215021.GB1146@tols.org> <200604131020.42417.jhb@freebsd.org> <20060414103810.GA18114@tols.org>
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On Friday 14 April 2006 06:38, Marco van Tol wrote: > On Thu, Apr 13, 2006 at 10:20:40AM -0400, John Baldwin wrote: > > On Wednesday 12 April 2006 17:50, Marco van Tol wrote: > > > Hi there, > > > > > > My apologies if this is the wrong list to ask this kind of question. > > > I would appreciate a pointer to the correct list if it is please. :) > > > > > > I noticed in the code for gkrellm /usr/ports/sysutils/gkrellm2 that SMP > > > per-cpu statistics were not yet supported under FreeBSD, and decided to > > > check whether I could add that. (I'm running a (dual-core) Athlon64 X2 > > > with FreeBSD 6.1-PRERELEASE) > > > I can't find sample code and/or documentation on how to acquire that > > > information from the kernel. > > [...] > > > > Is there an interface under FreeBSD to acquire the necessary per-cpu > > > statistics? > > > > They don't exist currently. I have a patch to make the stats per-CPU > > for performance reasons (though it only helps out on systems with lots > > of CPUs (like 10) and hurts on systems with fewer CPUs (like 4)). It > > doesn't include a sysctl to get the per-CPU stats, but I could add one. > > OK, that I could use to get started on the code for adding per-CPU stats to > gkrellm under FreeBSD. Is the patch against FreeBSD CURRENT? > > Then if the per-CPU stats code hits the STABLE trunk, it's likely to be only > a few changes to what I did perhaps. Or am I running a bit to far ahead > here? :) > > Is the patch in available your home area on www.freebsd.org? An early one but it doesn't export the data to userland yet. I need to figure out what interface to use for that. I could have the cp_time sysctl just include the CPU arrays after the global array and key off the passed in length to determine if they should be included or not. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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