Messages in this thread | | | From | (Eric W. Biederman) | Date | Fri, 01 Jun 2018 10:25:59 -0500 | Subject | Re: [PATCH 0/4] exit: Make unlikely case in mm_update_next_owner() more scalable |
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Michal Hocko <mhocko@kernel.org> writes:
> On Fri 01-06-18 09:32:42, Eric W. Biederman wrote: >> Michal Hocko <mhocko@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.
> 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.
Eric
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