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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 02:51:37 -0700
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

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

> > Just a small techical correction: we remove mapping only when we are 
> > remapping page to contain another block.  So when page is evicted, it 
> > continues to map the same disk block until ext2fs decides that we want 
> > this page to hold another block (only if page is still evicted, of
> > course).
> Well, I think we ought to drain the mapping cache when the page is
> evicted.  This keeps memory usage lower.  Further, relative to the
> cost of reading from disk, adding an entry to the hashes, etc. is
> cheap.

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.

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