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

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Date:	Sun, 22 Feb 2015 11:48:41 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Vojtech Pavlik <vojtech@...e.com>,
	Josh Poimboeuf <jpoimboe@...hat.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>
Subject: Re: live kernel upgrades (was: live kernel patching design)


* Ingo Molnar <mingo@...nel.org> wrote:

> We have many of the building blocks in place and have 
> them available:
> 
>   - the freezer code already attempts at parking/unparking
>     threads transparently, that could be fixed/extended.
> 
>   - hibernation, regular suspend/resume and in general
>     power management has in essence already implemented
>     most building blocks needed to enumerate and
>     checkpoint/restore device state that otherwise gets
>     lost in a shutdown/reboot cycle.
> 
>   - c/r patches started user state enumeration and
>     checkpoint/restore logic

I forgot to mention:

    - kexec allows the loading and execution of a new 
      kernel image.

It's all still tons of work to pull off a 'live kernel 
upgrade' on native hardware, but IMHO it's tons of very 
useful work that helps a dozen non-competing projects, 
literally.

Thanks,

	Ingo
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