linux-kernel - Re: live kernel upgrades (was: live kernel patching design)

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Date:	Mon, 23 Feb 2015 10:18:54 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jiri Kosina <jkosina@...e.cz>, Ingo Molnar <mingo@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Borislav Petkov <bp@...en8.de>, live-patching@...r.kernel.org
Subject: Re: live kernel upgrades (was: live kernel patching design)

On 23 February 2015 at 09:01, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Sun, 22 Feb 2015 20:13:28 +0100 (CET) Jiri Kosina <jkosina@...e.cz> wrote:
>
>> But if you ask the folks who are hungry for live bug patching, they
>> wouldn't care.
>>
>> You mentioned "10 seconds", that's more or less equal to infinity to them.
>
> 10 seconds outage is unacceptable, but we're running our service on a
> single machine with no failover.  Who is doing this??

if I had to guess, telcos generally, you've only got one wire between a phone
and the exchange and if the switch on the end needs patching it better be fast.

Dave.
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