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From: "Ghannam, Yazen" <Yazen.Ghannam@amd.com>
To: Borislav Petkov <bp@alien8.de>, "Luck, Tony" <tony.luck@intel.com>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>
Subject: RE: [PATCH v3 4/6] x86/MCE: Make number of MCA banks per_cpu
Date: Wed, 22 May 2019 14:01:21 +0000
Message-ID: <SN6PR12MB26392392901AD4379E133BE0F8000@SN6PR12MB2639.namprd12.prod.outlook.com> (raw)
In-Reply-To: <20190521230927.GB2435@cz.tnic>

> -----Original Message-----
> From: linux-edac-owner@vger.kernel.org <linux-edac-owner@vger.kernel.org> On Behalf Of Borislav Petkov
> Sent: Tuesday, May 21, 2019 6:09 PM
> To: Luck, Tony <tony.luck@intel.com>
> Cc: Ghannam, Yazen <Yazen.Ghannam@amd.com>; linux-edac@vger.kernel.org; linux-kernel@vger.kernel.org; x86@kernel.org
> Subject: Re: [PATCH v3 4/6] x86/MCE: Make number of MCA banks per_cpu
> 
> 
> On Tue, May 21, 2019 at 01:42:40PM -0700, Luck, Tony wrote:
> > On Tue, May 21, 2019 at 10:29:02PM +0200, Borislav Petkov wrote:
> > >
> > > Can we do instead:
> > >
> > > -static DEFINE_PER_CPU_READ_MOSTLY(struct mce_bank *, mce_banks_array);
> > > +static DEFINE_PER_CPU_READ_MOSTLY(struct mce_bank, mce_banks_array[MAX_NR_BANKS]);
> > >
> > > which should be something like 9*32 = 288 bytes per CPU.
> > >
> >
> > Where did you get the "9" from?  struct mce_bank looks to
> > be over 50 bytes.
> 
> Patch 2/6 changes that:
> 
>  struct mce_bank {
>         u64                     ctl;                    /* subevents to enable */
>         bool                    init;                   /* initialise bank? */
> +};
> +static DEFINE_PER_CPU_READ_MOSTLY(struct mce_bank *, mce_banks_percpu);
> +
> +#define ATTR_LEN               16
> +/* One object for each MCE bank, shared by all CPUs */
> +struct mce_bank_dev {
>         struct device_attribute attr;                   /* device attribute */
>         char                    attrname[ATTR_LEN];     /* attribute name */
> +       u8                      bank;                   /* bank number */
>  };
> +static struct mce_bank_dev mce_bank_devs[MAX_NR_BANKS];
> 
> > Still only 1.5K per cpu though.
> 
> Yah, I think that using static per-CPU memory should be better than
> GFP_ATOMIC.
> 

Okay, makes sense. I'll send a patch soon.

Thanks,
Yazen

  reply index

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-30 20:32 [PATCH v3 0/6] Handle MCA banks in a per_cpu way Ghannam, Yazen
2019-04-30 20:32 ` [v3,1/6] x86/MCE: Make struct mce_banks[] static Yazen Ghannam
2019-04-30 20:32   ` [PATCH v3 1/6] " Ghannam, Yazen
2019-04-30 20:32 ` [v3,2/6] x86/MCE: Handle MCA controls in a per_cpu way Yazen Ghannam
2019-04-30 20:32   ` [PATCH v3 2/6] " Ghannam, Yazen
2019-04-30 20:32 ` [v3,3/6] x86/MCE/AMD: Don't cache block addresses on SMCA systems Yazen Ghannam
2019-04-30 20:32   ` [PATCH v3 3/6] " Ghannam, Yazen
2019-04-30 20:32 ` [v3,5/6] x86/MCE: Save MCA control bits that get set in hardware Yazen Ghannam
2019-04-30 20:32   ` [PATCH v3 5/6] " Ghannam, Yazen
2019-05-16 15:52   ` Luck, Tony
2019-05-16 16:14     ` Ghannam, Yazen
2019-05-16 16:56       ` Borislav Petkov
2019-05-16 17:09         ` Ghannam, Yazen
2019-05-16 17:21           ` Borislav Petkov
2019-05-16 20:20             ` Ghannam, Yazen
2019-05-16 20:34               ` Borislav Petkov
2019-05-16 20:59                 ` Luck, Tony
2019-05-17 10:10                   ` Borislav Petkov
2019-05-17 15:46                     ` Ghannam, Yazen
2019-05-17 16:37                       ` Borislav Petkov
2019-05-17 17:26                         ` Luck, Tony
2019-05-17 17:48                           ` Borislav Petkov
2019-05-17 18:06                             ` Luck, Tony
2019-05-17 19:34                               ` Borislav Petkov
2019-05-17 19:44                                 ` Luck, Tony
2019-05-17 19:50                                   ` Borislav Petkov
2019-05-17 19:49                                 ` Ghannam, Yazen
2019-05-17 20:02                                   ` Borislav Petkov
2019-05-23 20:00                                     ` Ghannam, Yazen
2019-05-27 23:28                                       ` Borislav Petkov
2019-06-07 14:49                                         ` Ghannam, Yazen
2019-06-07 16:37                                           ` Borislav Petkov
2019-06-07 16:44                                             ` Ghannam, Yazen
2019-06-07 16:59                                               ` Borislav Petkov
2019-06-07 17:08                                                 ` Ghannam, Yazen
2019-06-07 17:20                                                   ` Borislav Petkov
2019-06-11  5:13                                             ` Borislav Petkov
2019-04-30 20:32 ` [v3,4/6] x86/MCE: Make number of MCA banks per_cpu Yazen Ghannam
2019-04-30 20:32   ` [PATCH v3 4/6] " Ghannam, Yazen
2019-05-18 11:25   ` Borislav Petkov
2019-05-21 17:52     ` Ghannam, Yazen
2019-05-21 20:29       ` Borislav Petkov
2019-05-21 20:42         ` Luck, Tony
2019-05-21 23:09           ` Borislav Petkov
2019-05-22 14:01             ` Ghannam, Yazen [this message]
2019-04-30 20:32 ` [v3,6/6] x86/MCE: Treat MCE bank as initialized if control bits set in hardware Yazen Ghannam
2019-04-30 20:32   ` [PATCH v3 6/6] " Ghannam, Yazen

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