linux-kernel - Re: [PATCHv3] iommu/intel: Ratelimit each dmar fault printing

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Date:   Thu, 15 Mar 2018 15:22:53 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     linux-kernel@...r.kernel.org, 0x7f454c46@...il.com,
        Alex Williamson <alex.williamson@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        iommu@...ts.linux-foundation.org
Subject: Re: [PATCHv3] iommu/intel: Ratelimit each dmar fault printing

On Thu, Mar 15, 2018 at 02:13:03PM +0000, Dmitry Safonov wrote:
> So, you suggest to remove ratelimit at all?
> Do we really need printk flood for each happened fault?
> Imagine, you've hundreds of mappings and then PCI link flapped..
> Wouldn't it be better to keep ratelimiting?
> I don't mind, just it looks a bit strange to me.

I never said you should remove the ratelimiting, after all you are
trying to fix a soft-lockup, no?

And that should not be fixed by changes to the ratelimiting, but with
proper irq handling.


	Joerg