On Thu, Mar 01, 2007 at 02:33:01AM +0100, Andrea Arcangeli ([EMAIL PROTECTED])
wrote:
> On Thu, Mar 01, 2007 at 12:12:28AM +0100, Ingo Molnar wrote:
> > more capable by providing more special system calls like sys_upcall() to
> > execute a user-space function. (that way a syslet could still execute
> > user-space code without having to exit out of kernel mode too
> > frequently) Or perhaps a sys_x86_bytecode() call, that would execute a
> > pre-verified, kernel-stored sequence of simplified x86 bytecode, using
> > the kernel stack.
>
> Which means the userspace code would then run with kernel privilege
> level somehow (after security verifier, whatever). You remember I
> think it's a plain crazy idea...
Syslets/threadlets do not execute userspace code in kernel - they behave
similar to threads. sys_upcall() would be a wrapper for quite complex
threadlet machinery.
--
Evgeniy Polyakov
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