Messages in this thread |  | | Date | Mon, 27 May 2019 17:12:02 +0200 | From | Oleg Nesterov <> | Subject | Re: [RFC 5/7] mm: introduce external memory hinting API |
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On 05/27, Minchan Kim wrote: > > > another problem is that pid_task(pid) can return a zombie leader, in this case > > mm_access() will fail while it shouldn't. > > I'm sorry. I didn't notice that. However, I couldn't understand your point. > Why do you think mm_access shouldn't fail even though pid_task returns > a zombie leader?
The leader can exit (call sys_exit(), not sys_exit_group()), this won't affect other threads. In this case the process is still alive even if the leader thread is zombie. That is why we have find_lock_task_mm().
Oleg.
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