[ltt-dev] Porting "jump labels" to userspace

David Daney ddaney at caviumnetworks.com
Wed Feb 16 15:17:28 EST 2011

On 02/16/2011 12:04 PM, Roland McGrath wrote:
> IMHO there is not really so much to the in-kernel implementation that it's
> worth attempting to reuse the code in userland.  Pretty much all the work
> is in the details of the implementation that would naturally differ a lot
> in a different context.  If you understand the mechanism and the machine
> details, then implementing it well for a userland context is not a big deal
> and is cleaner to do from scratch than shoe-horning kernel-centric code
> into a wildly different context.

Good point.

Certainly the details of maintaining instruction cache coherency may be 
different in userspace.

David Daney

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