[lkml]   [2001]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Linux VM design
On September 24, 2001 11:36 am, VDA wrote:
> Daniel Phillips <> wrote:
> DP> The arguments in support of aging over LRU that I'm aware of are:
> DP> - incrementing an age is more efficient than resetting several LRU
> DP> list links
> DP> - also captures some frequency-of-use information
> Of what use this info can be? If one page is accessed 100 times/second
> and other one once in 10 seconds, they both have to stay in RAM.
> VM should take 'time since last access' into account whan deciding
> which page to swap out, not how often it was referenced.

You might want to have a look at this:
(lrfu algorithm)

To tell the truth, I don't really see why the frequency information is all
that useful either. Rik suggested it's good for streaming IO but we already
have effective means of dealing with that that don't rely on any frequency

So the list of reasons why aging is good is looking really short.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:17    [W:0.122 / U:3.672 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site