linux-kernel - Re: [PATCH 2/2] edac: add support for Amazon's Annapurna Labs EDAC

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Date:   Thu, 13 Jun 2019 09:56:20 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     James Morse <james.morse@....com>,
        "Hawa, Hanna" <hhhawa@...zon.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        "paulmck@...ux.ibm.com" <paulmck@...ux.ibm.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "Shenhar, Talel" <talel@...zon.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Chocron, Jonathan" <jonnyc@...zon.com>,
        "Krupnik, Ronen" <ronenk@...zon.com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "Hanoch, Uri" <hanochu@...zon.com>
Subject: Re: [PATCH 2/2] edac: add support for Amazon's Annapurna Labs EDAC

On Wed, 2019-06-12 at 13:00 +0200, Borislav Petkov wrote:
> On Wed, Jun 12, 2019 at 07:42:42AM -0300, Mauro Carvalho Chehab wrote:
> > That's said, from the admin PoV, it makes sense to have a single
> > daemon that collect errors from all error sources and take the
> > needed actions.
> 
> Doing recovery actions in userspace is too flaky. Daemon can get killed
> at any point in time

So what ? If root kills your RAS daemon, then so be it. That has never
been a problem on POWER8/POWER9 server platforms and those have some of
the nastiest RAS in town.

You can kill PID 1 too you know ... 

>  and there are error types where you want to do recovery *before* you return to userspace.

Very few (precise examples please) and I yet have to see why those need
some kind of magic coordinator.

> Yes, we do have different error reporting facilities but I still think
> that concentrating all the error information needed in order to do
> proper recovery action is the better approach here. And make that part
> of the kernel so that it is robust. Userspace can still configure it and
> so on.

Ben.