Re: [PATCH] Caches that shrink automatically

Linus Torvalds (torvalds@transmeta.com)
Sun, 4 Aug 2002 12:05:27 -0700 (PDT)


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.

Linus

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/