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Re: Shared library annoyance with gcc-3_0-branch

To: Linus Torvalds <torvalds at transmeta dot com>
Subject: Re: Shared library annoyance with gcc-3_0-branch
From: Andi Kleen <ak at suse dot de>
Date: 20 Feb 2001 22:32:40 +0100
Cc: gcc at gcc dot gnu dot org
References: <Pine.LNX.4.10.10102201149240.31099-100000@penguin.transmeta.com>

Linus Torvalds <torvalds@transmeta.com> writes:

> On Tue, 20 Feb 2001, Geert Bosch wrote:
> > 
> > BTW, what is the overhead on Linux for calling routines in dynamic
> > libraries as opposed to code statically linked in? Has anybody done
> 
> It's noticeable, and it depends on the architecture. 
[...]

A much bigger problem than function calls are data references. At least in
Linux/i386 currently a shared library data reference costs you a COW of the
referencing code page. Fortunately libgcc2 ATM  does seem to export only
a few data symbols ATM, but if they're often referenced shared text code
will be essentially turned off.

-Andi

References:
- Re: Shared library annoyance with gcc-3_0-branch
  - From: Linus Torvalds

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