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Re: Review of Thomas's >2GB ext2fs proposal

From: Thomas Bushnell BSG
Subject: Re: Review of Thomas's >2GB ext2fs proposal
Date: 17 Aug 2004 03:27:09 -0700
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

"Neal H. Walfield" <neal@cs.uml.edu> writes:

> The hashes and an array consisting of the reference count, a bit
> indicating if the page is in the kernel and another bit indicating if
> the page is allocated.

I could perfectly well adopt exactly the same strategy, and use a
cheaper but less precise policy for dropping cached mappings, if there
is really concern about the memory consumption of two extra pointers
per mapping.

Because mappings are cheaper, it is much less important to have
excellent long-term behavior.  It is really the near-term things that
are important; the many successive operations on the same inode, for
example.  In such a case, it is very unlikely that the drop random
mapping strategy will drop something actually in active use.


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