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

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Message-ID: <20250520194841.GA1322094@bhelgaas>
Date: Tue, 20 May 2025 14:48:41 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
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 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.