Re: Multiple kprobes per address

From: Vamsi Krishna S . (vamsi@in.ibm.com)
Date: Tue Nov 12 2002 - 03:33:08 EST

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In reply to: Rusty Lynch: "Re: Multiple kprobes per address"
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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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Next message: William Lee Irwin III: "[6/11] hugetlb: remove direct usage of struct inode"
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