linux-kernel - Re: [PATCH v6 15/16] PCI/AER: Add ratelimits to PCI AER Documentation

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Message-ID: <63e93c1c-9330-43ae-b381-fffde3864da3@linux.intel.com>
Date: Tue, 20 May 2025 13:36:43 -0700
From: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: linux-pci@...r.kernel.org, Jon Pan-Doh <pandoh@...gle.com>,
 Karolina Stolarek <karolina.stolarek@...cle.com>,
 Martin Petersen <martin.petersen@...cle.com>,
 Ben Fuller <ben.fuller@...cle.com>, Drew Walton <drewwalton@...rosoft.com>,
 Anil Agrawal <anilagrawal@...a.com>, Tony Luck <tony.luck@...el.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Lukas Wunner <lukas@...ner.de>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Sargun Dhillon <sargun@...a.com>, "Paul E . McKenney" <paulmck@...nel.org>,
 Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
 Oliver O'Halloran <oohall@...il.com>, Kai-Heng Feng <kaihengf@...dia.com>,
 Keith Busch <kbusch@...nel.org>, Robert Richter <rrichter@....com>,
 Terry Bowman <terry.bowman@....com>, Shiju Jose <shiju.jose@...wei.com>,
 Dave Jiang <dave.jiang@...el.com>, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v6 15/16] PCI/AER: Add ratelimits to PCI AER Documentation

On 5/20/25 12:48 PM, Bjorn Helgaas wrote:
> On Mon, May 19, 2025 at 10:01:09PM -0700, Sathyanarayanan Kuppuswamy wrote:
>> On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
>>> From: Jon Pan-Doh <pandoh@...gle.com>
>>>
>>> Add ratelimits section for rationale and defaults.
>>> +AER Ratelimits
>>> +--------------
>>> +
>>> +Since error messages can be generated for each transaction, we may see
>>> +large volumes of errors reported. To prevent spammy devices from flooding
>>> +the console/stalling execution, messages are throttled by device and error
>>> +type (correctable vs. uncorrectable).
>> Can we list exceptions like DPC and FATAL errors (if added) ?
> Like this?
>
>    +... messages are throttled by device and error
>    +type (correctable vs. non-fatal uncorrectable).  Fatal errors, including
>    +DPC errors, are not ratelimited.
>
> DPC is currently only triggered for fatal errors.

Yes.  I think it is good enough.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer