Boris,

On 1/13/17 00:52, Borislav Petkov wrote:
On Mon, Jan 09, 2017 at 09:33:47PM -0600, Suravee Suthikulpanit wrote:
This patch adds multi-IOMMU support for perf by exposing
an AMD IOMMU PMU for each IOMMU found in the system via:

  /sys/device/amd_iommu_x     /* where x is the IOMMU index. */
Straight into the top-level devices hierarchy?

Why not add a proper hierarchy to

/sys/devices/system/iommu/ ...

?

Jörg, don't you have a sane iommu hierarchy already in sysfs?


IIUC, Perf tools looks at the /sys/devices/xxxxx to identify availalble PMUs.
Are you planning to have perf tools look at /sys/devices/system/iommu/xxx 
instead?

Suravee
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