Re: "Enhanced" MD code avaible for review
From: Jeff Garzik
Date: Thu Mar 25 2004 - 20:07:54 EST
Justin T. Gibbs wrote:
I respectfully disagree with the EMD folks that a userland approach is
impossible, given all the failure scenarios.
I've never said that it was impossible, just unwise. I believe
that a userland approach offers no benefit over allowing the kernel
to perform all meta-data operations. The end result of such an
approach (given feature and robustness parity with the EMD solution)
is a larger resident side, code duplication, and more complicated
configuration/management interfaces.
There is some code duplication, yes. But the right userspace solution
does not have a larger RSS, and has _less_ complicated management
interfaces. A key benefit of "do it in userland" is a clear gain in
flexibility, simplicity, and debuggability (if that's a word).
But it's hard. It requires some deep thinking. It's a whole lot easier
to do everything in the kernel -- but that doesn't offer you the
protections of userland, particularly separate address spaces from the
kernel, and having to try harder to crash the kernel. :)
Jeff
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