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From: "Jan H. Schönherr" <jschoenh@amazon.de>
To: "Luck, Tony" <tony.luck@intel.com>,
	"Ghannam, Yazen" <Yazen.Ghannam@amd.com>,
	Borislav Petkov <bp@alien8.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH v2 6/6] x86/mce: Dynamically register default MCE handler
Date: Thu, 9 Jan 2020 23:30:18 +0100
Message-ID: <1161eb84-4ebc-f938-f0ef-82ff6440dbd5@amazon.de> (raw)
In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F7F5202EC@ORSMSX115.amr.corp.intel.com>

On 09/01/2020 22.54, Luck, Tony wrote:
>> It seems to me that the issue is the mcelog notifier counts toward the number
>> of notifiers, so the default notifier doesn't print anything.
> 
> If we gave a API to the notifiers to say whether to suppress printing, then the
> dev_mcelog() code could do the suppression only if some process had
> /dev/mcelog open. So if mcelog(8) wasn't running, you'd still see the console
> message.

I briefly looked into that.

There is the issue that mcelog code buffers MCEs unconditionally. And we probably
don't want to deactivate that, so that MCEs during boot can be queried
a bit later via /dev/mcelog.

We would get a bit of duplicate logging, if we let mcelog report "supress
printing" only if there is an actual consumer. (Or if there was a consumer
once, in case there are periodically polling consumers.)

Regards
Jan

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  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-03 15:07 [PATCH v2 0/6] x86/mce: Various fixes and cleanups for MCE handling Jan H. Schönherr
2020-01-03 15:07 ` [PATCH v2 1/6] x86/mce: Take action on UCNA/Deferred errors again Jan H. Schönherr
2020-01-10  9:50   ` Borislav Petkov
2020-01-10 18:45     ` Luck, Tony
2020-01-11 13:06       ` Borislav Petkov
2020-01-11 13:17       ` Borislav Petkov
2020-01-03 15:07 ` [PATCH v2 2/6] x86/mce: Make mce=nobootlog work again Jan H. Schönherr
2020-01-03 15:07 ` [PATCH v2 3/6] x86/mce: Fix use of uninitialized MCE message string Jan H. Schönherr
2020-01-03 15:07 ` [PATCH v2 4/6] x86/mce: Allow a variable number of internal MCE decode notifiers Jan H. Schönherr
2020-01-03 15:07 ` [PATCH v2 5/6] x86/mce: Do not take action on SRAO/Deferred errors on AMD for now Jan H. Schönherr
2020-01-03 15:07 ` [PATCH v2 6/6] x86/mce: Dynamically register default MCE handler Jan H. Schönherr
2020-01-03 19:46   ` Luck, Tony
2020-01-03 21:42   ` Luck, Tony
2020-01-03 22:03   ` Borislav Petkov
2020-01-08  4:24     ` Ghannam, Yazen
2020-01-08 10:03       ` Borislav Petkov
2020-01-09 20:39         ` Ghannam, Yazen
2020-01-09 21:54           ` Luck, Tony
2020-01-09 22:30             ` Jan H. Schönherr [this message]
2020-01-04 11:49   ` kbuild test robot

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