Messages in this thread | | | Date | Wed, 24 Jan 2007 22:22:43 +0800 | From | "Aubrey Li" <> | Subject | Re: [RFC] Limit the size of the pagecache |
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On 1/24/07, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > On Tue, 2007-01-23 at 16:49 -0800, Christoph Lameter wrote: > > This is a patch using some of Aubrey's work plugging it in what is IMHO > > the right way. Feel free to improve on it. I have gotten repeatedly > > requests to be able to limit the pagecache. With the revised VM statistics > > this is now actually possile. I'd like to know more about possible uses of > > such a feature. > > > > > > > > > > It may be useful to limit the size of the page cache for various reasons > > such as > > > > 1. Insure that anonymous pages that may contain performance > > critical data is never subject to swap. > > This is what we have mlock for, no? > > > 2. Insure rapid turnaround of pages in the cache. > > This sounds like we either need more fadvise hints and/or understand why > the VM doesn't behave properly. > > > 3. Reserve memory for other uses? (Aubrey?) > > He wants to make a nommu system act like a mmu system; this will just > never ever work.
Nope. Actually my nommu system works great with some of patches made by us. What let you think this will never work?
>Memory fragmentation is a real issue not some gimmick > thought up by the hardware folks to sell these mmu chips. > I totally disagree. Memory fragmentations is the issue not only on nommu, it's also on mmu chips. That's not the reason mmu chips can be sold.
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