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

From: Ognyan Kulev
Subject: Re: Review of Thomas's >2GB ext2fs proposal
Date: Tue, 17 Aug 2004 13:06:26 +0300
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040413 Debian/1.6-5

Thomas Bushnell BSG wrote:
I'm confused.  It sounded like Ognyan was saying that the page is
still assigned to the same area.  But it is necessary to vm_free when
the kernel tells you to page out.  It is unfriendly (and very bad for
performance) to hold on to the page.

vm_free is something that libpager takes care of.

You are probably confused because "map" can have 2 meanings:

1. Mapping page of address space to page of pager.
2. Mapping page of pager to disk block.

And the current ext2fs relies heavily on the ability to remap (2).


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