linux-kernel - Re: [PATCH] modules: Use a better scheme for refcounting

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Message-ID: <482D1110.2040604@cosmosbay.com>
Date:	Fri, 16 May 2008 06:44:00 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Mike Travis <travis@....com>
Subject: Re: [PATCH] modules: Use a better scheme for refcounting

Andi Kleen a écrit :
> Eric Dumazet <dada1@...mosbay.com> writes:
>   
>> Instead of wasting NR_CPUS*128 bytes (on i386), we now use
>> num_possible_cpus*sizeof(local_t) bytes.
>>
>> On a typical distro, where NR_CPUS=8, 
>>     
>
> More typical would be NR_CPUS=128, with NR_CPUS=four digits 
> when Mike Travis et.al. are finished
>
>   
Yes. With NR_CPUS=4096, we save about half a megabyte per module. (!!!)

>> shiping 2000 modules, we reduce
>>     
>
> Surely only the loaded modules count? Perhaps 20-30.
>
>   
Well, I should have stated that this saving also takes place in the 
module disk file.
(The "struct module" is included in it, in the 
".gnu.linkonce.this_module" section)
Here on my distro, around 2000 modules are shiped.
> But it's a cool improvement. Very nice.
>   
Thanks




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