linux-kernel - Re: live patching design (was: Re: [PATCH 1/3] sched: add sched_task

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Message-ID: <alpine.LNX.2.00.1502221005310.2357@pobox.suse.cz>
Date:	Sun, 22 Feb 2015 10:08:26 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Ingo Molnar <mingo@...nel.org>
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>
Subject: Re: live patching design (was: Re: [PATCH 1/3] sched: add
 sched_task_call())

On Sun, 22 Feb 2015, Ingo Molnar wrote:

> I am making specific technical arguments, but you attempted to redirect 
> my very specific arguments towards 'differences in philosophy' and 
> 'where to draw the line'. Lets discuss the merits and brush them aside 
> as 'philosophical differences' or a made up category of 'consistency 
> models'.
> 
> Anyway, let me try to reboot this discussion back to technological 
> details by summing up my arguments in another mail.

Sounds good, thanks. Don't get me wrong -- I am not really opposing your 
solution (because it's of course quite close to what kgraft is doing :p ), 
but I'd like to make sure we understand each other well.

I still have to think a little bit more about how to handle kthreads 
properly even in your proposed solution (i.e. how exactly is it superior 
to what kgraft is currently doing in this respect). We'd have to go 
through all them anyway, and make them parkable, right?

Thanks,

-- 
Jiri Kosina
SUSE Labs
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