Messages in this thread | | | Date | Mon, 2 Jul 2018 16:05:02 +0200 | From | Michal Hocko <> | Subject | Re: [RFC v3 PATCH 4/5] mm: mmap: zap pages with read mmap_sem for large mapping |
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On Fri 29-06-18 20:15:47, Andrew Morton wrote: [...] > Would one of your earlier designs have addressed all usecases? I > expect the dumb unmap-a-little-bit-at-a-time approach would have?
It has been already pointed out that this will not work. You simply cannot drop the mmap_sem during unmap because another thread could change the address space under your feet. So you need some form of VM_DEAD and handle concurrent and conflicting address space operations. -- Michal Hocko SUSE Labs
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