On Thu, 28 Aug 2008, H. Peter Anvin wrote:
quoted text
> This is *hard* to get right, and we screw this up in the kernel with 
> painful regularity.  The throught of having user-space processes, which 
> don't have access to the kernel locking primitives and functions like 
> copy_from_user() dealing with this stuff scares me crazy.

What issues exactly are you thinking of?

quoted text
> That is why I'm suggesting using an in-kernel linearizer.

Lots of complexity, ugh...  Even Tejun's current scheme is better IMO.

Miklos

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