linux-kernel - Re: [PATCH 00/30] C/R OpenVZ/Virtuozzo style

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Message-ID: <20090413073925.GB7085@x200.localdomain>
Date:	Mon, 13 Apr 2009 11:39:25 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	xemul@...allels.com, serue@...ibm.com, dave@...ux.vnet.ibm.com,
	mingo@...e.hu, orenl@...columbia.edu, hch@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/30] C/R OpenVZ/Virtuozzo style

On Fri, Apr 10, 2009 at 08:06:55AM -0700, Linus Torvalds wrote:
> On Fri, 10 Apr 2009, Alexey Dobriyan wrote:
> >
> > This is to show how we see C/R and to provoke discussion on number of
> > important issues (mounts, ...).
> 
> My only initial reaction is that I absolutely hate the naming (not to say 
> I love the code - just to say that I didn't even look at it, because I got 
> hung up on the name).
> 
> "cr"? It could be anything. I realize that to _you_ that is meaningful, 
> but to somebody less specifically interested in checkpoint-restore 'cr' 
> means 'carriage return' or just doesn't really say anything at all. 

Well, in OpenVZ everything is in kernel/cpt/ and prefixed with "cpt_"
and "rst_". And I think "cr_" is super nice prefix: it's short, it's C-like,
it reminds about restart part. Eventually, C/R will become standard
in-kernel thing everyone should be at least aware of, so it's like
learning what "vma" means.

> That goes both for file naming (kernel/cr/xyzzy.c) and to a lesser degree 
> for function naming too. I also don't think it makes sense to have 
> something like kernel/cr/cr-x86_32.c or kernel/cr/cr-tty.c - maybe that is 
> good right now, but I sure hope that the long-term goal is to have these 
> things in the code that will need to change them when the code gets 
> updated (ie arch/x86/kernel and drivers/char/)

In the long run, yes, C/R should be moved closer to core code it tries to
checkpoint. Right now, however, doing "make kernel/cr/" is much quicker
and C/R can not do much, so it's unclear how exactly splitting should be
done.
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