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Re: [PLUG] ldt_modify and detailed information
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On Tuesday 18 May 2004 13:39, aglist@metashadow.com wrote:
| but i did not know in depth how it works. that's why i want to look up how
| linux handles/creates the default segments and user created segments. i
| have more questions like "if i malloc 64M+ of memory, are all the pages
| automatically created, or does it only create pages and table entries as
| the memory is accessed."
In Linux, all pages are accounted for at boot time. Pages are then assigned or
deassigned as necessary.
| the same question goes for user created
| segments. i do not want to use all my swap space on empty pages and
| really large page directories.
This would be handled via the ELF format in some way. If allowed for by the
ELF specifications, you would include your custom segment in the binary
somehow and possibly dictate how you would like it to be handled. This may
require the introduction of new code into libc and/or the kernel to make
happen properly, however. A good reading of the ELF spec should set you on
the right track, followed by an investigation of the mm/ subdir in the Linux
kernel sources.
- --
Tobias DiPasquale
202A 04C4 2CE6 B985 8520 88D6 CD25 1A6C B9B5 1595
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