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Date: Tue, 12 Nov 2002 14:03:08 +0530
From: "Vamsi Krishna S ." <vamsi@in.ibm.com>
To: Rusty Lynch <rusty@linux.co.intel.com>
Cc: linux-kernel@vger.kernel.org, richard <richardj_moore@uk.ibm.com>
Subject: Re: Multiple kprobes per address
Message-ID: <20021112140308.A1055@in.ibm.com>
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In-Reply-To: <002e01c289b1$2c83b140$77d40a0a@amr.corp.intel.com>; from rusty@linux.co.intel.com on Mon, Nov 11, 2002 at 10:35:56AM -0800
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On Mon, Nov 11, 2002 at 10:35:56AM -0800, Rusty Lynch wrote:
> I was really only concerned with multiple consumers of kprobes.  So if
> I were to create some tool that used kpobes to hook into the kernel, and
> someone else were to create another tool that solved a different problem
> but also used kprobes then the two tools wouldn't play nice with each other.

There will be a problem when both the tools (built on top of kprobes) try
to place probes at the same address: only the first probe actually succeds,
the second one gets -EEXIST from register_kprobe.

This could be made to work, but at the moment, it seems unnecessary 
complication to me. Lets reconsider it when it really becomes a problem.

Thanks,
Vamsi. 
-- 
Vamsi Krishna S.
Linux Technology Center,
IBM Software Lab, Bangalore.
Ph: +91 80 5044959
Internet: vamsi@in.ibm.com
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