linux-kernel - Re: [PATCH 03/10] jump label v11: base patch

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Message-ID: <4C98ECD4.5020606@zytor.com>
Date:	Tue, 21 Sep 2010 10:35:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Andi Kleen <andi@...stfloor.org>, Jason Baron <jbaron@...hat.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	mathieu.desnoyers@...ymtl.ca, tglx@...utronix.de,
	roland@...hat.com, rth@...hat.com, mhiramat@...hat.com,
	fweisbec@...il.com, avi@...hat.com, davem@...emloft.net,
	vgoyal@...hat.com, sam@...nborg.org, tony@...eyournoodle.com
Subject: Re: [PATCH 03/10] jump label v11: base patch

On 09/21/2010 08:14 AM, Steven Rostedt wrote:
>>
>>> Also, I think the hash table deals nicely with modules.
>>
>> Maybe but it's also a lot of code. And it seems to me
>> that it is optimizing the wrong thing. Simpler is nicer.
> 
> I guess simplicity is in the eye of the beholder. I find hashes easier
> to deal with than binary searching sorted lists. Every time you add a
> tracepoint, you need to resort the list.
> 
> Hashes are much easier to deal with and scale nicely. I don't think
> there's enough rational to switch this to a binary list.
> 

If all you need is exact matches -- as in this case -- hashes are
generally faster than binary anyway.

	-hpa
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