Messages in this thread | | | Date | Mon, 13 Feb 2012 13:57:45 -0800 | Subject | Re: [PATCH] Avoid mask based num_possible_cpus and num_online_cpus -v5 | From | Tony Luck <> |
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On Mon, Feb 13, 2012 at 12:44 PM, Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> wrote: > IOW, what output do you see from the following printk from > arch/ia64/kernel/smpboot.c? > > printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", > (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100);
That is a complicated question - because linux-next also has patches by Arjan that change how (when) cpus are brought online. Initially I blamed his patches and tried reverting them ... and saw the symptom you are wondering about (message said "Total of 1 processors", but the BogoMIPs was a number big enough to be all of them. Thanks to you, I can now understand why.
Fix will be to stop ia64 from messing directly with cpu_online_map?
-Tony -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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