Hi!

> The conclusion: it's cannot be implemented without slowdown.
> So ignore my patch.

Of course it can.

One possibility would be to implement it as ptrace(SETUID) and only
allow it if we know other task is not in kernel. [And then cean up any 
remaining problems.]

-- 
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

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