Re: filecache/swapcache questions

[Rik van Riel <riel@nl.linux.org>]

On Tue, 15 Jun 1999, Kanoj Sarcar wrote:

> Q1. Is it really needed to put all the swap pages in the swapper_inode
> i_pages?

Yes, see below.

> How will it be possible for a page to be in the swapcache, for its
> reference count to be 1 (which has been checked just before), and for
> its swap_count(page->offset) to also be 1? I can see this being
> possible only if an unmap/exit path might lazily leave a anonymous
> page in the swap cache, but I don't believe that happens.

It does happen. We use a 'two-stage' reclamation process instead
of page aging. It seems to work wonderfully -- nice page aging
properties without the overhead. Plus, it automatically balances
swap and cache memory since the same reclamation routine passes
over both types of pages.


Rik -- Open Source: you deserve to be in control of your data.
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