linux-kernel - Re: [Openipmi-developer] [PATCH 3/4] IPMI: convert locked counters to atomics

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Message-id: <47BC4543.2050503@acm.org>
Date:	Wed, 20 Feb 2008 09:20:35 -0600
From:	Corey Minyard <minyard@....org>
To:	Matt Domsch <Matt_Domsch@...l.com>
Cc:	Andrew Morton <akpm@...l.org>,
	Konstantin Baydarov <kbaidarov@...mvista.com>,
	OpenIPMI Developers <openipmi-developer@...ts.sourceforge.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Openipmi-developer] [PATCH 3/4] IPMI: convert locked counters to
 atomics

Matt Domsch wrote:
> On Thu, Feb 14, 2008 at 12:30:51PM -0600, Corey Minyard wrote:
>   
>> From: Konstantin Baydarov <kbaidarov@...mvista.com>
>>
>> Atomics are a lot more efficient and neat than using a lock.
>>     
>
> per_cpu variables are a lot more efficient and neat than using locks
> for simple statistics.  no cache line bouncing to increment the
> counter.  Are these read so often that atomics are really better?
>   
I agree, I'll put this in the plan for the future.  I don't have time to 
do it at this point, but the changes made in these patches should make 
it easy to change in the future.

Thanks,

-corey
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