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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 02:55:29 -0700
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

Ognyan Kulev <ogi@fmi.uni-sofia.bg> writes:

> Eviction in itself does nothing except to raise the flag that page is
> evicted.  When ext2fs searches for a page that can be remapped[1],
> only those that are marked as evicted _and_ with reference count of
> zero are considered for remapping.  Locking and other stuff take care
> of the tricky remapping.

This is bad.  When the kernel pages a page out, you must free the
memory.  It is not ok to just set a flag and keep the page that the
kernel handed you.  You must free it, or you are hosing the vm system.

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