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SubjectRe: [patch v3] mm, oom: fix unnecessary killing of additional processes
On Fri 06-07-18 17:05:39, David Rientjes wrote:
[...]
> Blockable mmu notifiers and mlocked memory is not the extent of the
> problem, if a process has a lot of virtual memory we must wait until
> free_pgtables() completes in exit_mmap() to prevent unnecessary oom
> killing. For implementations such as tcmalloc, which does not release
> virtual memory, this is important because, well, it releases this only at
> exit_mmap(). Of course we cannot do that with only the protection of
> mm->mmap_sem for read.

And how exactly a timeout helps to prevent from "unnecessary killing" in
that case?
--
Michal Hocko
SUSE Labs

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