[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] perfc: count number of explicit vcpu yields
On Mon, Nov 09, 2015 at 04:47:20PM +0100, Dario Faggioli wrote: > On Mon, 2015-11-09 at 15:23 +0000, Ian Campbell wrote: > > On Mon, 2015-11-09 at 16:14 +0100, Dario Faggioli wrote: > > > > > > > As far as xl accessibility --- doesn't xenperf already read them > > > > out? > > > > > > > Mmm... ISTR having tried without much luck, and having heard that > > > it > > > wasn't functional any longer, but maybe I'm confusing it with > > > something > > > else. I'll try again. > > > > I happened to have an xterm with this in its scroll buffer from > > earlier: > > > > root@marilith-n0:~# xenperf > > invalid hypercalls T= 0 0 > > 0 0 0 > > trap: wfi T= 85068 56068 > > 11762 8461 8777 > > trap: wfe T= 2811 614 > > 716 964 517 > > trap: cp15 32-bit access T= 4 1 > > 1 1 1 > > trap: cp15 64-bit access T= 0 0 > > 0 0 0 > > trap: cp14 32-bit access T= 0 0 > > 0 0 0 > > trap: cp14 64-bit access T= 0 0 > > 0 0 0 > > trap: cp14 dbg access T= 0 0 > > 0 0 0 > > trap: cp access T= 0 0 > > 0 0 0 > > trap: 32-bit smc T= 0 0 > > 0 0 0 > > trap: 32-bit hvc T= 1291 510 > > 568 161 52 > > trap: guest instr abort T= 0 0 > > 0 0 0 > > trap: guest data abort T= 16446 6885 > > 4358 3431 1772 > > trap: condition failed T= 0 0 > > 0 0 0 > > [...] > > > > So I think it works. > > > Ok, thanks for the confirmation, and sorry for the noise then. > > > You need to build the hypervisor binary with perfc=y (and optionally > > perfc_arrays=y) or it doesn't do anything. > > > Yeah, that I knew. And you need to apply an patch this patch for x86: http://lists.xen.org/archives/html/xen-devel/2015-11/msg00633.html since the lock_profile also adds tons of data in the 'struct spinlock' making the 'struct domain' bigger than 4K (to 68K!). > > Thanks again and Regards, > Dario > -- > <<This happens because I choose it to happen!>> (Raistlin Majere) > ----------------------------------------------------------------- > Dario Faggioli, Ph.D, http://about.me/dario.faggioli > Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxx > http://lists.xen.org/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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