Messages in this thread | | | Subject | Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) | From | Magnus Damm <> | Date | Mon, 21 Aug 2006 11:42:58 +0900 |
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On Fri, 2006-08-18 at 10:59 -0700, Rohit Seth wrote: > On Fri, 2006-08-18 at 09:42 -0700, Andrew Morton wrote: > > On Fri, 18 Aug 2006 07:45:48 -0700 > > Dave Hansen <haveblue@us.ibm.com> wrote: > > > > > On Fri, 2006-08-18 at 12:08 +0400, Andrey Savochkin wrote: > > > > > > > > A) Have separate memory management for each container, > > > > with separate buddy allocator, lru lists, page replacement mechanism. > > > > That implies a considerable overhead, and the main challenge there > > > > is sharing of pages between these separate memory managers. > > > > > > Hold on here for just a sec... > > > > > > It is quite possible to do memory management aimed at one container > > > while that container's memory still participates in the main VM. > > > > > > There is overhead here, as the LRU scanning mechanisms get less > > > efficient, but I'd rather pay a penalty at LRU scanning time than divide > > > up the VM, or coarsely start failing allocations. > > > > > > > I have this mad idea that you can divide a 128GB machine up into 256 fake > > NUMA nodes, then you use each "node" as a 512MB unit of memory allocation. > > So that 4.5GB job would be placed within an exclusive cpuset which has nine > > "mems" (what are these called?) and voila: the job has a hard 4.5GB limit, > > no kernel changes needed. > > > Sounds like an interesting idea. Will have to depend on something like > memory hot-plug to get the things move around...
Yeah, moving things around: The pzone memory resource controller introduces dynamically sized zones if I remember correctly.
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/ magnus
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