Re: Would SSI clustering extensions be of interest to kernel community?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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
----------------------------------------

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux