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[Bug 1380432] Comment bridged from LTC Bugzilla


------- 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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  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


  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

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