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

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Message-ID: <alpine.LNX.2.00.1502221959470.19920@pobox.suse.cz>
Date:	Sun, 22 Feb 2015 20:03:04 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
cc:	Ingo Molnar <mingo@...nel.org>, Vojtech Pavlik <vojtech@...e.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	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 Sun, 22 Feb 2015, Josh Poimboeuf wrote:

> Yes, there have been some suggestions that we should support multiple 
> consistency models, but I haven't heard any good reasons that would 
> justify the added complexity.

I tend to agree, consistency models were just a temporary idea that seems 
to likely become unnecessary given all the ideas on the unified solution 
that have been presented so far.

(Well, with a small exception to this -- I still think we should be able 
to "fire and forget" for patches where it's guaranteed that no 
housekeeping is necessary -- my favorite example is again fixing out of 
bounds access in a certain syscall entry ... i.e. the "super-simple" 
consistency model).

-- 
Jiri Kosina
SUSE Labs
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