Re: [9fans] automatic page sharing

[Enrico Weigelt <weigelt@metux.de>]

Russ Cox wrote:

Hi,

>> Assuming statically linked-in libraries are properly aligned,
>> we'll have lots of equal pages in the system, so the kernel could
>> find and automatically map them together.
>
> This is not true.  When static libraries are linked into
> a target binary, only the necessary objects are taken,
> and all the symbol references are resolved (avoiding
> the need for relocation at load time), and the code is
> not position-independent.  So even if they were "properly
> aligned", the bits of common code would be very small.

Assuming PIC, of course ;-)

My idea is to get rid of mmap() for shared libraries but w/o
loosing the code sharing behind the scenes.


cu
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 Enrico Weigelt, metux IT service -- http://www.metux.de/

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