Re: [PATCH 1/3] Kprobes: Make kprobe modules more portable

From: Christoph Hellwig
Date: Tue Aug 08 2006 - 13:30:27 EST

On Tue, Aug 08, 2006 at 06:28:28PM +0100, Paulo Marques wrote:
> Just one side note: kallsyms_lookup_name is _really_ inefficient. The
> kallsyms structure is tailored so that kallsyms_lookup (the most
> frequently used function) is really fast. Doing it the other way around
> involves a O(N) search, uncompressing every symbol name as it goes :P
> I don't think this is really a performance problem for users like
> kprobes, but I just wanted people to keep in mind that there is a
> penalty involved in calling kallsyms_lookup_name.

That's true. One more reason to not expose this interface to the public.
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