linux-kernel - Re: [PATCH] workqueue: Implement delayed_work

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Message-ID: <CACuw83qcNAX1RNr=G6cfGeLqTKL-rtDLpK60o65BB50dLPMOzA@mail.gmail.com>
Date:   Wed, 24 May 2017 22:16:02 +0200
From:   Alex Naidis <alex.naidis@...ux.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: Implement delayed_work_busy()

Hello,

2017-05-24 22:01 GMT+02:00 Tejun Heo <tj@...nel.org>:
> Hello, Alex.
>
> On Wed, May 24, 2017 at 09:58:19PM +0200, Alex Naidis wrote:
>> Yeah, I agree, it is wrong to rely on work_busy() providing correct data.
>> However sometimes it is useful to have an indicator like this to at least
>> catch some cases where requeuing work would be obsolete.
>> This applies for delayed work too.
>
> Can you elaborage on "requeueing work would be obsolate" a bit?
Sure.
The case that I mean is represented well by the usage of work_busy here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/acpi/bus.c#n534
It checks work_busy() before requeuing the work, since in some cases
it is obsolete
to requeue the work if it is already pending or running.
>
> Thanks.
>
> --
> tejun

Alex