Re: [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall

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To: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Subject: Re: [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall
From: Michal Hocko <mhocko@xxxxxxxx>
Date: Mon, 15 Nov 2021 11:43:57 +0100
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, thuth@xxxxxxxxxx, frankja@xxxxxxxxxxxxx, borntraeger@xxxxxxxxxx, Ulrich.Weigand@xxxxxxxxxx, david@xxxxxxxxxx, ultrachin@xxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, vbabka@xxxxxxx, brookxu.cn@xxxxxxxxx, xiaoggchen@xxxxxxxxxxx, linuszeng@xxxxxxxxxxx, yihuilu@xxxxxxxxxxx, daniel.m.jordan@xxxxxxxxxx, axboe@xxxxxxxxx, legion@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, aarcange@xxxxxxxxxx, christian@xxxxxxxxxx, tglx@xxxxxxxxxxxxx
In-reply-to: <20211112175309.7e0fe52a@p-imbrenda>
References: <20211111095008.264412-1-imbrenda@linux.ibm.com> <20211111095008.264412-4-imbrenda@linux.ibm.com> <874k8ixzx0.fsf@email.froward.int.ebiederm.org> <20211112103439.441b4c12@p-imbrenda> <87v90xv2uu.fsf@email.froward.int.ebiederm.org> <20211112175309.7e0fe52a@p-imbrenda>

On Fri 12-11-21 17:53:09, Claudio Imbrenda wrote:
[...]
> Of course, but this also means that it's not possible to stop the OOM
> killer while the teardown is in progress,

Blocking the OOM killer and depend on the userspace to make a forward
progress is not acceptable solution.
-- 
Michal Hocko
SUSE Labs

References:
- [RFC v1 0/4] Two alternatives for mm async teardown
  - From: Claudio Imbrenda
- [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall
  - From: Claudio Imbrenda
- Re: [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall
  - From: Eric W. Biederman
- Re: [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall
  - From: Claudio Imbrenda
- Re: [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall
  - From: Eric W. Biederman
- Re: [RFC v1 2/4] kernel/fork.c: implement new process_mmput_async syscall
  - From: Claudio Imbrenda

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