Re: [PATCH] Caches that shrink automatically

From: Linus Torvalds (
Date: Sun Aug 04 2002 - 14:05:27 EST

On Sun, 4 Aug 2002, Rik van Riel wrote:
> > In particular, it is useless for the sub-caches to try to maintain their
> > own LRU lists and their own accessed bits. But that doesn't mean that
> > they can _act_ as if they updated their own accessed bits, while really
> > just telling the page-based thing that that page is active.
> I'm not sure I agree with this. For eg. the dcache you will want
> to reclaim the less used entries on a page even if there are a few
> very intensely used entries on that page.

True in theory, but I doubt you will see it very much in practice.

Most of the time when you want to free dentries, it is because you have a
_ton_ of them.

The fact that some will look cold even if they aren't should not matter
that much statistically.

Yah, it's a guess. We can test it.


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