Messages in this thread | | | Date | Mon, 16 Oct 2006 19:47:02 +0200 | From | Constantine Gavrilov <> | Subject | Re: Would SSI clustering extensions be of interest to kernel community? |
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Please see inline...
Aneesh Kumar K.V wrote:
> > I am interested in seeing the changes. I am right now working on > getting parts of OpenSSI (www.openssi.org) > changes merged upstream. Bruce Walker of the OpenSSI project have a > design of implementing cluster wide procs. The > same doc can be found on www.openssi.org website. The paper talks > about how to implement cluster wide proccess model > without requiring home/deputy concept. But yes it require some core > kernel changes. But should be Conditionally enabled > like selinux. So overhead for non cluster users should be nill.
I am personally not interested in making intrusive kernel changes even if it yields in true "single-system image". I want very small changes (preferrably none).
> > Regarding my work you can see the status here > http://git.openssi.org/~kvaneesh/gitweb.cgi?p=ci-to-linus.git;a=summary > > It only gets the ICS changes. That means it introduce a transport > independent kernel cluster framework. Right now it supports two > interconnect IPV4 and infiniband verbs.
We also have transport abstraction layer and transport plugins for TCP/IP, SDP (Infiniband and possibly others), and SCI (Dolphin).
> I am planning on taking the CFS changes. That should bring in > clusterwide shared memory too. The way it was done in OpenSSI > was to hook a new nopage() function for CFS so that when we page > fault, we bring the pages from other node.So i am not sure whether > one need a VM hook for getting clusterwide shared memory. But without > seeing the code i am clueless. > Nopage will be called if there is no pte. That means, with just nopage you cannot implement RO-RW transition. If you use nopage only, you cannot have multiple readers, because you cannot invalidate all other readers if one reader goes read-write. Thus nopage allows single reader or single writer whle the page fault hook allows multiple readers and single writer.
-- ---------------------------------------- Constantine Gavrilov Kernel Developer Qlusters Software Ltd 1 Azrieli Center, Tel-Aviv Phone: +972-3-6081977 Fax: +972-3-6081841 ----------------------------------------
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