linux-kernel - Re: changing internal kernel system mechanism in runtime by a module patch

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Message-ID: <20061117070612.GE3735@rhun.zurich.ibm.com>
Date:	Fri, 17 Nov 2006 09:06:12 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Yitzchak Eidus <ieidus@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: changing internal kernel system mechanism in runtime by a module patch

On Fri, Nov 17, 2006 at 06:58:29AM +0000, Christoph Hellwig wrote:

> This kind of stuff is just sick.  Better let them play with their research
> OS for this kind of thing :)

sick, research, what's the difference? :-)

> In practice any non-trivial bug fix requires
> changes to global data structures so reloading a module doesn't make
> sense.

... unless you have a mechanism (which k42 does) to interpose between
data structures and the users of said structures, which you can use to
decide when to repace them.

> And for module-specific problems you should be able to hack around using
> kprobes if you really need (but then again for a mission critical system
> you should have proper active-active failover clustering anyway)

I'm not advocating we merge this - nor have I seen the implementation
for Linux yet - no need to preemptively scorch it from orbit :-)

Cheers,
Muli
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