On 2/13/07, Alan <[email protected]> wrote:
> A syslet is executed opportunistically: i.e. the syslet subsystem
> assumes that the syslet will not block, and it will switch to a
> cachemiss kernel thread from the scheduler. This means that even a
How is scheduler fairness maintained ? and what is done for resource
accounting here ?
> that the kernel fills and user-space clears. Waiting is done via the
> sys_async_wait() system call. Completion can be supressed on a per-atom
They should be selectable as well iff possible.
> Open issues:
Let me add some more
sys_setuid/gid/etc need to be synchronous only and not occur
while other async syscalls are running in parallel to meet current kernel
assumptions.
sys_exec and other security boundaries must be synchronous only
and not allow async "spill over" (consider setuid async binary patching)
> - sys_fork() and sys_async_exec() should be filtered out from the
> syscalls that are allowed - first one only makes sense with ptregs,
clone and vfork. async_vfork is a real mindbender actually.
> second one is a nice kernel recursion thing :) I didnt want to
> duplicate the sys_call_table though - maybe others have a better
> idea.
What are the semantics of async sys_async_wait and async sys_async ?
Ooooohh. OpenVMS lives forever ;) Me likeee ;)
--
Dmitry
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