Re: [patch 0/4] Series to allow a "const" file_operations struct

[Eric Dumazet <dada1@cosmosbay.com>]

Arjan van de Ven a écrit :
> On Fri, 2006-01-06 at 22:45 +0100, Arjan van de Ven wrote:
> > Hi,
> >
> > this series allows drivers to have "const" file_operations, by making
> > the f_ops field in the inode const. This has another benefit, there have
>
> ok there was a sentence missing here. The first benefit is that this
> moves these hot datastructures to the rodata section, which means they
> won't accidentally be doing false cacheline sharing.

Definitly a good thing I agree.

But your patches miss to really declare all 'struct file_operations' as const, 
dont they ?


On my x86_64 machine, I managed to reduce by 10% .data section by moving all 
file_operations, but also 'address_space_operations', 'inode_operations, 
super_operations, dentry_operations, seq_operations, ... to rodata section.

size vmlinux*
   text    data     bss     dec     hex filename
2476156  522236  244868 3243260  317cfc vmlinux
2588685  571348  246692 3406725  33fb85 vmlinux.old

Eric

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