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    SubjectRe: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support
    On 2/13/07, Alan <alan@lxorguk.ukuu.org.uk> 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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