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SubjectRe: 2.4.8/2.4.9 VM problems
On Mon, 20 Aug 2001, Daniel Phillips wrote:
> On August 20, 2001 09:12 pm, Marcelo Tosatti wrote:

> > Find riel's message with topic "VM tuning" to linux-mm, then take a look
> > at the 4th aging option.
> >
> > That one _should_ be able to make us remove all kinds of "hacks" to do
> > drop behind, and also it should keep hot/warm active memory _in cache_
> > for more time.
> I looked at it yesterday. The problem is, it loses the
> information about *how* a page is used: pagecache lookup via
> readahead has different implications than actual usage.

- How is that different from your use-once thing ?
- Where do we do "pagecache lookup via readahead"
without "actual usage" of the page ?

> The other thing that looks a little problematic, which Rik also
> pointed out, is the potential long lag before the inactive page
> is detected. A lot of IO can take place in this time, filling up
> the active list with pages that we could have evicted much
> earlier.

The lag I described to you had to do with the different
kinds of page aging used and with the time it takes for
previously "hot" pages to cool down and become inactive

I think you have things mixed up here ;)


IA64: a worthy successor to the i860.

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