Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.

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Subject: Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
From: "NeilBrown" <neilb@xxxxxxx>
Date: Wed, 29 Nov 2023 10:40:51 +1100
Cc: "Christian Brauner" <brauner@xxxxxxxxxx>, "Al Viro" <viro@xxxxxxxxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxxxx>, "Chuck Lever" <chuck.lever@xxxxxxxxxx>, "Jeff Layton" <jlayton@xxxxxxxxxx>, "Ingo Molnar" <mingo@xxxxxxxxxx>, "Peter Zijlstra" <peterz@xxxxxxxxxxxxx>, "Juri Lelli" <juri.lelli@xxxxxxxxxx>, "Vincent Guittot" <vincent.guittot@xxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx
In-reply-to: <20231128172959.GA27265@redhat.com>
References: <170112272125.7109.6245462722883333440@noble.neil.brown.name>, <20231128-arsch-halbieren-b2a95645de53@brauner>, <20231128135258.GB22743@redhat.com>, <20231128-elastisch-freuden-f9de91041218@brauner>, <20231128165945.GD22743@redhat.com>, <20231128172959.GA27265@redhat.com>

On Wed, 29 Nov 2023, Oleg Nesterov wrote:
> Forgot to menstion,
> 
> On 11/28, Oleg Nesterov wrote:
> >
> > but please
> > note irq_thread()->task_work_add(on_exit_work).
> 
> and this means that Neil's and your more patch were wrong ;)

Yes it does - thanks for that!
I guess we need a setting that is focused particularly on fput().
Probably a PF flag is best for that.

Thanks,
NeilBrown

> 
> Oleg.
> 
>

References:
- [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
  - From: NeilBrown
- Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
  - From: Christian Brauner
- Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
  - From: Oleg Nesterov
- Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
  - From: Christian Brauner
- Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
  - From: Oleg Nesterov
- Re: [PATCH/RFC] core/nfsd: allow kernel threads to use task_work.
  - From: Oleg Nesterov

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