Re: [PATCH v4 2/2] perf x86: Exposing an Uncore unit to PMON for Intel Xeon® server platform

[Andi Kleen]

> > Roman, 
> > 
> > I suppose you'll need something like
> > 
> > /sys/device/system/dieXXX/pci-pmon<0-3>/bus 
> > 
> > and bus could be a symlink to the pci bus directory.
> 
> Why do you need to link to the pci bus directory?

The goal is to identify which bus is counted by the perfmon
counter. I suppose it could be a field containing the bus
identifier too, but I think symlinks are used elsewhere.

> > The whole thing will be ugly and complicated and slow and difficult
> > to parse, but it will presumably follow Greg's rules.
> 
> Who needs to parse this?  What tool will do it and for what?

perf parses is to output PCI bandwidth per PCI device.

-Andi