Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thu, Mar 01, 2007 at 02:33:01AM +0100, Andrea Arcangeli (andrea@xxxxxxx) 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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