On 06/12, Oleg Nesterov wrote:
>
> On 06/12, Ingo Molnar wrote:
> >
> > * Linus Torvalds <torva...@linux-foundation.org> wrote:
> >
> > > So I think the only issue is that ->mm can become NULL when the thread
> > > group
> > > leader dies - a non-NULL mm should always be shared among all threads.
> >
> > Indeed, we do that in exit_mm().
>
> Yes,
>
> > So we could add tsk->mm_leader or so,
>
> No, no, please do not. Just do something like
>
> for_each_process(p) {
>
> for_each_thread(p, t) {
> if (t->mm) {
> do_something(t->mm);
> break;
> }
> }
> }
>
> But either way I don't understand what protects this ->mm. Perhaps this needs
> find_lock_task_mm().
And, I don't understand this code, probably this doesn't matter, but.
unpin_all() is probably fine, but xen_mm_pin_all() can race with fork()
and miss the new child. Is it OK?
Oleg.
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