Re: Memory statistics

[David Turner <dturner nds com>]

Hi Michael,

michael meeks a écrit :
> 	I think you're confused here - at least, for the architecture I'm using
> (x86/x86_64) the .plt is RO/sharable & executable, .rel.plt is
> RO/sharable/non-exec, and of course all the real .plt fixups occur in
> the GOT section, as you would expect.
>
>   
You're right, I was confused about this topic. However, fact remains 
that some entries in the GOT cannot
be always shared *if* the weird ELF dynamic linking semantics are 
followed to the letter (e.g. look for
symbols in the program before any other shared library).

However, it also seems that nearly nobody needs them anyway: schemes 
like kdeinit and maemo-launcher simply ignore
the semantics for newly launched programs, and I've never seen any 
complaint about that.
> > Apart from that, you'll get relocations.
> >     
>
> 	Honestly - the more I look at the picture, the more I think using a
> 'kdeinit' type approach might be rather better - at least for the core
> apps: nautilus, panel etc.
>
>   
When looking for all the stuff needed to do "reasonable" dynamic linking 
on Linux, I get the feeling that
the pile of successive hacks required far outstrip the benefits of the 
current implementation; and I wonder if
the trade-offs that ELF was designed around are still absolutely valid 
today.

But you're right that a "kdeinit" approach is the low-hanging fruit at 
the moment.


Regards,

- David Turner
- The FreeType Project  (www.freetype.org)


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