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------- Comment From suka@xxxxxxxxxx 2014-10-22 00:44 EDT-------
(In reply to comment #7)
> I've tried verifying a build with this patch on top of our current 3.16
> Utopic tree and the above sysfs directory was still not found. Are there
> additional steps required to enable the hv_24x7 device? I have been testing
> on a POWER8 machine.

Hmm, are you running in a KVM guest ?  I don't think 24x7 counters
are supported in KVM guests yet.

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https://bugs.launchpad.net/bugs/1380432

Title:
  24x7 counters: Bug in catalog_read()

Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Utopic:
  In Progress

Bug description:
  ---Problem Description---
  24x7 counters: Bug in catalog_read()
   
  ---Additional Hardware Info---
  Power8 system with support for 24x7 counters 

   Machine Type = Power8 IBM,9119-MME 
   
   
  ---Steps to Reproduce---
  cp /sys/bus/event_source/devices/hv_24x7/interface/catalog /tmp
  ls -l /tmp/catalog

  Shows a file size 0 for the /tmp/catalog.
   
  We recently discovered a bug in the upstream Linux kernel. It was 
  fixed by this patch

  https://lkml.org/lkml/2014/10/1/35

  and that patch is scheduled to be included in powerpc tree.

  When it is included, we should back port to Ubuntu 14.10 or next
  release.

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