On Fri 01-06-18 10:25:59, Eric W. Biederman wrote: > Michal Hocko <mho...@kernel.org> writes: > > > On Fri 01-06-18 09:32:42, Eric W. Biederman wrote: > >> Michal Hocko <mho...@kernel.org> writes: > > [...] > >> > Group leader exiting early without tearing down the whole thread > >> > group should be quite rare as well. No question that somebody might do > >> > that on purpose though... > >> > >> The group leader exiting early is a completely legitimate and reasonable > >> thing to do, even if it is rare. > > > > I am not saying it isn't legitimate. But the most common case is the > > main thread waiting for its threads or calling exit which would tear the > > whole group down. Is there any easy way to achieve this other than tkill > > to group leader? Calling exit(3) from the leader performs group exit > > IIRC. > > pthread_exit from the group leader.
Right, forgot to mention this one but this would be quite exotic, right? > > I am not arguing this is non-issue. And it certainly is a problem once > > somebody wants to be nasty... I was more interested how often this > > really happens for sane workloads. > > That is a fair question. All I know for certain is that whatever Kirill > Tkhai's workload was it was triggering this the slow path. Yeah, that was exactly why I've asked that originally. It must be something pretty special ;) -- Michal Hocko SUSE Labs
