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

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Date:   Fri, 17 Jan 2020 15:21:54 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Greg KH <gregkh@...ux-foundation.org>
Cc:     roman.sudarikov@...ux.intel.com, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        eranian@...gle.com, bgregg@...flix.com, kan.liang@...ux.intel.com,
        alexander.antonov@...el.com
Subject: Re: [PATCH v4 2/2] perf x86: Exposing an Uncore unit to PMON for Intel Xeon® server platform

> > 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