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    SubjectRe: [RFC PATCH(Experimental) 0/4] Freezer based Cpu-hotplug
    On 02/18, Oleg Nesterov wrote:
    >
    > On 02/17, Rafael J. Wysocki wrote:
    > >
    > > Alternatively, we can move the check into refrigerator(), like this:
    > >
    > > --- linux-2.6.20-git13.orig/kernel/power/process.c
    > > +++ linux-2.6.20-git13/kernel/power/process.c
    > > @@ -39,6 +39,11 @@ void refrigerator(void)
    > > /* Hmm, should we be allowed to suspend when there are realtime
    > > processes around? */
    > > long save;
    > > +
    > > + /* Freeze the task unless there is a vfork completion pending */
    > > + if (current->vfork_done)
    > > + return;
    > > +
    >
    > This means that "current" returns to user space (get_signal_to_deliver
    > will clear TIF_SIGPENDING) and runs. While try_to_freeze_tasks() thinks
    > it is frozen.

    Ah, sorry. I am wrong, current has no PF_FROZEN yet.

    However, this means that sys_vfork() makes impossible to freeze processes
    until child exits/execs. Not good.

    Oleg.

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