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DateFri, 16 May 2008 06:44:00 +0200
FromEric Dumazet <>
SubjectRe: [PATCH] modules: Use a better scheme for refcounting
Andi Kleen a écrit :
> Eric Dumazet <dada1@cosmosbay.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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