Re: linux-next: add utrace tree

From: Frank Ch. Eigler
Date: Fri Jan 29 2010 - 13:15:42 EST

Ingo Molnar <mingo@xxxxxxx> writes:

> [...] So, to sum it up: utrace XOL, which is rather complex already,
> needs even more complexity (which is not yet implemented) than the
> much simpler common-case emulator approach i outlined, just to break
> even with the performance of the much simpler approach. [...]

Is it an uncontroversial claim that emulation of CISC instructions
should perform better than their native execution, followed by an int3
(as in the simplest working scheme) or boosting (as done by kprobes)?
>From my experience with simulators, "simple" software emulation of
cpus can be hundreds of times slower or worse than native execution.

- FChE
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