* Linus Torvalds <torva...@linux-foundation.org> wrote:
> On Thu, Jun 11, 2015 at 1:37 PM, Linus Torvalds
> <torva...@linux-foundation.org> wrote:
> >
> > Don't use "for_each_process_thread(g, p)". You only care about each mm, and
> > threads all share the same mm, so just do
> >
> > for_each_process(p)
> >
> > instead of iterating over all threads too.
>
> Hmm. I may be wrong. It strikes me that one of the group leaders might have
> exited but the subthreads live on. We'd see p->mm being NULL, even though the
> mm
> was originally in use.
>
> Ugh. So maybe the code really does need to iterate over all threads.
Yeah, for_each_process() is indeed no guarantee that we iterate over all mm's.
We might make it so: but that would mean restricting certain clone_flags
variants
- not sure that's possible with our current ABI usage?
Thanks,
Ingo
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