Date: Fri, 14 Apr 2006 10:38:10 +0000 From: Marco van Tol <marco@tols.org> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Per CPU cpu-statistics under SMP Message-ID: <20060414103810.GA18114@tols.org> In-Reply-To: <200604131020.42417.jhb@freebsd.org> References: <20060412215021.GB1146@tols.org> <200604131020.42417.jhb@freebsd.org>
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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? Thanks! Marco -- A male gynecologist is like an auto mechanic who never owned a car. - Carrie Snow
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