Re: journaling & VM (was: Re: reiserfs being part of the kernel: it'snot just the code)

[Rik van Riel <riel@conectiva.com.br>]

On Thu, 8 Jun 2000, Manfred Spraul wrote:
> "Stephen C. Tweedie" wrote:
> > On Wed, Jun 07, 2000 at 11:40:47PM +0200, Juan J. Quintela wrote:
> > > Hi
> > > Fair enough, don't put pinned pages in the LRU, *why* do you want put
> > > pages in the LRU if you can't freed it when the LRU told it: free that
> > > page?
> > 
> > Because even if the information about which page is least recently
> > used doesn't help you, the information about which filesystems are
> > least active _does_ help.
> 
> What about using a time based aproach for pinned pages?
> 
> * only individually freeable pages are added into the LRU.
> * everyone else registers callbacks.
> * shrink_mmap estimates (*) the age (in jiffies) of the oldest entry in
> the LRU, and then it calls the pressure callbacks with that time.

This is exactly what one global LRU will achieve, at less
cost and with better readable code.

Rik
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