linux-kernel - Re: [PATCH RFC fs/namespace] Make kern_unmount() use synchronize_rcu

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Date:   Wed, 27 Apr 2022 00:58:34 +0200
From:   Christoph Bartoschek <bartoschek@...gle.com>
To:     paulmck@...nel.org
Cc:     Chris Mason <clm@...com>, Giuseppe Scrivano <gscrivan@...hat.com>,
        linux-kernel@...r.kernel.org,
        "riel@...riel.com" <riel@...riel.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>
Subject: Re: [PATCH RFC fs/namespace] Make kern_unmount() use synchronize_rcu_expedited()

> 3. https://lore.kernel.org/lkml/20220218183114.2867528-1-riel@surriel.com/
>         Refined queue_rcu_work() approach.
>
> #1 should work, but the resulting IPIs are not going to make the real-time
> guys happy.  #2 and #3 have been subject to reasonably heavy testing
> and did fix a very similar issue to the one that you are reporting,
> but last I knew there were doubts about the concurrency consequences.
>
> Could you please give at least #3 a shot and see if it helps you?
>

I have tried #3 and it works well with my testcases as far as I can see it.

Christoph