From: Christoph Hellwig <hch@infradead.org>
To: Paulo Marques <pmarques@grupopie.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Stephen Hemminger <shemminger@osdl.org>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] Kprobes: Make kprobe modules more portable
Date: Tue, 8 Aug 2006 18:32:42 +0100 [thread overview]
Message-ID: <20060808173242.GA1739@infradead.org> (raw)
In-Reply-To: <44D8C9BC.40102@grupopie.com>
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.
next prev parent reply other threads:[~2006-08-08 17:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-07 11:55 [PATCH 1/3] Kprobes: Make kprobe modules more portable Ananth N Mavinakayanahalli
2006-08-07 12:00 ` [PATCH 2/3] Kprobes: Define retval helper Ananth N Mavinakayanahalli
2006-08-07 12:04 ` [PATCH 3/3] Kprobes: Update Documentation/kprobes.txt Ananth N Mavinakayanahalli
2006-08-08 16:27 ` Christoph Hellwig
2006-08-09 9:48 ` Ananth N Mavinakayanahalli
2006-08-09 10:24 ` Ananth N Mavinakayanahalli
2006-08-08 16:25 ` [PATCH 2/3] Kprobes: Define retval helper Christoph Hellwig
2006-08-09 4:37 ` Andi Kleen
2006-08-09 9:43 ` Ananth N Mavinakayanahalli
2006-08-09 9:45 ` Christoph Hellwig
2006-08-09 9:55 ` Andi Kleen
2006-08-09 10:19 ` Ananth N Mavinakayanahalli
2006-08-09 10:28 ` Martin Schwidefsky
2006-08-09 13:16 ` David Howells
2006-08-09 15:20 ` Ananth N Mavinakayanahalli
2006-08-07 12:06 ` [PATCH 1/3] Kprobes: Make kprobe modules more portable Ananth N Mavinakayanahalli
2006-08-08 16:24 ` Christoph Hellwig
2006-08-08 16:34 ` Stephen Hemminger
2006-08-08 16:40 ` Christoph Hellwig
2006-08-08 17:28 ` Paulo Marques
2006-08-08 17:32 ` Christoph Hellwig [this message]
2006-08-09 9:51 ` Ananth N Mavinakayanahalli
2006-08-09 16:01 ` David Smith
2006-08-09 16:10 ` Christoph Hellwig
2006-08-09 16:18 ` Christoph Hellwig
2006-08-10 14:10 ` Keshavamurthy Anil S
2006-08-16 13:20 ` Christoph Hellwig
2006-08-11 8:53 ` Ananth N Mavinakayanahalli
2006-08-10 6:18 ` Ananth N Mavinakayanahalli
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