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

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Message-ID: <20061117064732.GC3735@rhun.zurich.ibm.com>
Date:	Fri, 17 Nov 2006 08:47:32 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Yitzchak Eidus <ieidus@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: changing internal kernel system mechanism in runtime by a module patch

On Thu, Nov 16, 2006 at 09:19:50PM +0200, Yitzchak Eidus wrote:

> is it possible to replace linux kernel internal functions such as
> schdule () to lets say my_schdule () in a run time with a module
> patch???  (so that every call in the kernel to schdule() will go to
> my_schdule()... ) ???

Not in Linux.

> i am talking about a clean/standard way to do such thing
> (without overwrite the mem address of the function and replace it in a
> dirty way...)

k42 supports "dynamic hot-swap" and there's been some work done to
bring it into Linux, see e.g.,
http://ozlabs.org/pipermail/k42-discussion/2006-October/001615.html.

Cheers,
Muli


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