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Comment: Reminds me of the Cache Kernel. (Score 2, Interesting) 631

by Grenamier (#31562536) Attached to: Multicore Requires OS Rework, Windows Expert Says

The part of the article where Probert discusses the operating system becoming something like a hypervisor reminds me of the Cache Kernel from a Stanford University paper back in 1994. http://www-dsg.stanford.edu/papers/cachekernel/main.html

The way I understand it, the cache kernel in kernel mode doesn't really have built-in policy for traditional OS tasks like scheduing or resource management. It just serves as a cache for loading and unloading for things like addresses spaces and threads and making them active. The policy for working with these things comes from separate application kernels in user mode and kernel objects that are loaded by the cache kernel.

There's also a 1997 MIT paper on exokernels (http://pdos.csail.mit.edu/papers/exo-sosp97/exo-sosp97.html). The idea is separating the responsibility of management from the responsibility of protection. The exokernel knows how to protect resources and the application knows how to make them sing. In the paper, they build a webserver on this architecture and it performs very well.

Both of these papers have research operating systems that demonstate specialized "native" applications running alongside unmodified UNIX applications running on UNIX emulators. That would suggest rebuilding an operating system in one of these styles wouldn't entail throwing out all the existing software or immediately forcing a new programming model on developers who aren't ready.

Microsoft used to talk about "personalities" in NT. It had subsystems for OS/2 1.x, WIn16, and Win32 that would allow apps from OS/2 (character mode), Windows 3.1 and Windows NT running as peers on top of the NT kernel. Perhaps someday the subsystems come back, some as OS personalities running traditional apps, and some as whole applications with resource management policy in their own right. Notepad might just run on the Win32 subsystem, but Photoshop might be interested in managing its own memory as well as disk space.

The mid-90s were fun for OS research, weren't they? :)


New Rules May Raise Cost of Buying Gadgets Online 171

Posted by timothy
from the in-their-infinite-wisdom dept.
ericatcw writes "Buying your next laptop or smartphone online could suddenly get a lot more expensive if a little-known US Department of Transportation proposal to tighten rules around the shipment of small, Lithium-Ion battery-powered devices by air goes through, says an industry group opposing the move. The changes, designed primarily to reduce the risk from Lithium-Ion batteries, would also forbid air travelers from carrying spare alkaline or NiMH batteries in their checked-in luggage, according to the head of the Portable Rechargeable Battery Association. The proposal is under review until March 12. It can be viewed and commented upon by members of the public."

Psystar Activation Servers Down? 245

Posted by Soulskill
from the bad-news-bears dept.
An anonymous reader writes "I purchased Rebel EFI in support of Psystar's crusade back in October. Just 3 short months later, I have no support. I found this out when I upgraded my hard drive and installed Snow Leopard using Rebel EFI. The program can no longer 'phone home' to activate or download/install drivers. This is a direct contradiction to Psystar's promise posted on their website: 'Psystar will continue to support all of its existing customers of hardware and software through this transitional period. Warranties on hardware will continue to be honored as long the customer has a valid warranty. Rebel EFI support for existing customers, as always, will remain exclusively available through email and the built-in ticket interface.' Has anyone else run into this issue? It has been 9 days with no response from Psystar by e-mail or phone."

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