Messages in this thread | | | Date | Thu, 6 Jan 2005 11:38:27 +0000 | From | Luke Kenneth Casson Leighton <> | Subject | Re: [Xen-devel] Re: [XEN] using shmfs for swapspace |
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On Tue, Jan 04, 2005 at 09:05:13AM -0500, Rik van Riel wrote: > On Tue, 4 Jan 2005, Mark Williamson wrote: > > >>for doing opportunistic page recycling ("I dont need this page but when > >>I ask for it back please tell me if you trashed the content") > > > >We've talked about doing this but AFAIK nobody has gotten round to it > >yet because there hasn't been a pressing need (IIRC, it was on the todo > >list when Xen 1.0 came out). > > > >IMHO, it doesn't look terribly difficult but would require (hopefully > >small) modifications to the architecture independent code, plus a little > >bit of support code in Xen. > > The architecture independant changes are fine, since > they're also useful for S390(x), PPC64 and UML... > > >I'd quite like to look at this one fine day but I suspect there are more > >useful things I should do first... > > I wonder if the same effect could be achieved by just > measuring the VM pressure inside the guests and > ballooning the guests as required, letting them grow > and shrink with their workloads.
mem = 64M-128M target = 64M
"if needed, grow me to 128mb but if not, whittle down to 64".
mem=64M-128 target=128M
"if you absolutely have to, steal some of my memory, but don't nick any more than 64M".
i'm probably going to have to "manually" implement something like this.
l.
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