On Sun, Mar 9, 2014 at 5:57 AM, Oleg Nesterov <o...@redhat.com> wrote:
>
> No, dup_task_struct() is obviously lockless. And the new child is not yet
> visible to for_each_process_thread().
Ok, then the siimple approach is to just do
/* Did we miss an invalidate event? *
if (mm->seqcount < tsk->seqcount)
clear_vma_cache();
after making the new thread visible.
Then the "race" becomes one of "we cannot have 4 billion mmap/munmap
events in other threads while we're setting up a new thread", which I
think is fine.
Linus
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