Messages in this thread | | | Subject | Re: [RFC] Limit the size of the pagecache | From | Peter Zijlstra <> | Date | Wed, 24 Jan 2007 13:58:08 +0100 |
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On Wed, 2007-01-24 at 23:50 +1100, Nick Piggin wrote: > Peter Zijlstra wrote: > > On Tue, 2007-01-23 at 16:49 -0800, Christoph Lameter wrote: > > >>2. Insure rapid turnaround of pages in the cache. > > [...] > > > The only maybe valid point would be 2, and I'd like to see if we can't > > solve that differently - a better use-once logic comes to mind. > > There must be something I'm missing with that point. The faster > the turnaround of pagecache pages, the *less* efficiently the > pagecache is working (assuming a rapid turnaround means a high > rate of pages brought into, then reclaimed from pagecache). > > I can't argue that a smaller pagecache will be subject to a > higher turnaround given the same workload, but I don't know why > that would be a good thing.
I interpreted the issue as selecting the wrong pages for the 'working set'. Like not quickly evicting pages from a large streaming read, which then pushes out more useful pages.
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