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Date:   Fri, 17 Jan 2020 15:21:54 -0800
From:   Andi Kleen <ak@linux.intel.com>
To:     Greg KH <gregkh@linux-foundation.org>
Cc:     roman.sudarikov@linux.intel.com, peterz@infradead.org,
        mingo@redhat.com, acme@kernel.org, mark.rutland@arm.com,
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        eranian@google.com, bgregg@netflix.com, kan.liang@linux.intel.com,
        alexander.antonov@intel.com
Subject: Re: [PATCH v4 2/2] perf =?iso-8859-1?Q?x86?=
 =?iso-8859-1?Q?=3A_Exposing_an_Uncore_unit_to_PMON_for_Intel_Xeon?=
 =?iso-8859-1?Q?=AE?= server platform
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> > 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