From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josh Boyer Date: Fri, 04 Apr 2008 15:33:18 +0000 Subject: Re: [kvm-ppc-devel] Oprofile kvmppc - mini howto and Message-Id: <1207323199.6518.0.camel@weaponx> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-ppc@vger.kernel.org On Fri, 2008-04-04 at 08:46 -0500, Hollis Blanchard wrote: > On Friday 04 April 2008 06:01:41 Christian Ehrhardt wrote: > > Note the bad thing, atm oprofile on ppc440 seems not to have hw perf > > counters available. Therefore it is covered with the fallback > > timer-interrupt. But this has drawbacks: =>from the oprfile info page: > > "In 2.6 kernels on CPUs without OProfile support for the hardware > > performance counters, the driver falls back to using the timer interrupt > > for profiling. Like the RTC mode in 2.4 kernels, this is not able to > > profile code that has interrupts disabled. Note that there are no > > configuration parameters for setting this, unlike the RTC and hardware > > performance counter setup." > > > > So oprofile works but without real cpu perf counters it will be nearly > > useless, because we have interrupts disabled in most code we want to > > profile. I need to look out for some beta support (or write my own) for > > ppc440 cpu perf counters to enable that for us :( > > I don't see any performance counters in the 440 user manuals. There aren't any that I'm aware of. The only performance monitor I've seen on 440 chip is for the PLB, and I don't believe that is useful for your purposes. josh ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ kvm-ppc-devel mailing list kvm-ppc-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-ppc-devel