Date: Sun, 22 Feb 2015 11:48:41 +0100
From: Ingo Molnar <mingo@kernel.org>
To: Jiri Kosina <jkosina@suse.cz>
Cc: Vojtech Pavlik <vojtech@suse.com>, Josh Poimboeuf <jpoimboe@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>, Seth Jennings <sjenning@redhat.com>,
        linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Arjan van de Ven <arjan@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Borislav Petkov <bp@alien8.de>
Subject: Re: live kernel upgrades (was: live kernel patching design)
Message-ID: <20150222104841.GA25335@gmail.com>
References: <20150220194901.GB3603@gmail.com>
 <20150220214613.GA21598@suse.com>
 <20150221181852.GA8406@gmail.com>
 <alpine.LNX.2.00.1502211952120.2357@pobox.suse.cz>
 <20150221191607.GA9534@gmail.com>
 <alpine.LNX.2.00.1502212025450.2357@pobox.suse.cz>
 <20150221194840.GA10126@gmail.com>
 <alpine.LNX.2.00.1502212058080.2357@pobox.suse.cz>
 <20150222084601.GA23491@gmail.com>
 <20150222094639.GA23684@gmail.com>
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* Ingo Molnar <mingo@kernel.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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