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On Wed, 2003-06-18 at 11:23, Anders Karlsson wrote:
> AIX uses (or used to use) the exact same way of reading/writing data
> from/to disk for all I/O. AIX also makes a distinction between code and
> data. If code in RAM is unused, it simply gets flushed. If it is needed
> again at a later time, it is paged in from disk where it was originally
> loaded from. Only dirty data is paged out into swap.
>=20
> Is it feasible to tweak the Linux VM to behave in the same fashion? If
> Linux already does it this way, I'll just shut up. :)
The distinction in Linux is between anonymous and file-backed mappings.
Executables are file mappings so the pages can just be dropped and they
will be read in from the backing file when needed again. This also holds
true for memory mapped files.
When a mapping has no file (anonymous) then the swap is used. This is
one of the reasons I like mmap() it means you dont end up using swap for
storing buffers containing bits of files which are on disk anyway.
--=20
// Gianni Tedesco (gianni at scaramanga dot co dot uk)
lynx --source www.scaramanga.co.uk/gianni-at-ecsc.asc | gpg --import
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