linux-kernel - Re: [PATCH v5 1/3] perf/x86/intel/uncore: Cache logical pkg id in uncore driver

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Date:   Tue, 7 Nov 2017 23:19:55 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Prarit Bhargava <prarit@...hat.com>
cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Piotr Luc <piotr.luc@...el.com>,
        Kan Liang <kan.liang@...el.com>, Borislav Petkov <bp@...e.de>,
        Stephane Eranian <eranian@...gle.com>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        He Chen <he.chen@...ux.intel.com>,
        Mathias Krause <minipli@...glemail.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH v5 1/3] perf/x86/intel/uncore: Cache logical pkg id in
 uncore driver

On Sun, 5 Nov 2017, Prarit Bhargava wrote:
> diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
> index d45e06346f14..87ef77982248 100644
> --- a/arch/x86/events/intel/uncore.c
> +++ b/arch/x86/events/intel/uncore.c
> @@ -947,6 +947,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id
>  
>  	atomic_inc(&box->refcnt);
>  	box->pci_phys_id = phys_id;
> +	box->logical_pkg_id = topology_phys_to_logical_pkg(box->pci_phys_id);

So in that same function topology_phys_to_logical_pkg() has been called
already and the result is in the local variable 'pkg' which gets assigned
in the very next line.....

>  	box->pkgid = pkg;
>  	box->pci_dev = pdev;
>  	box->pmu = pmu;

uncore_pci_remove() does not use the cached data either. Can we please make
that consistent?

Thanks,

	tglx