linux-kernel - Re: [RFC 5/5] pm: remove kernel thread freezing

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Message-ID: <1507061605.2567.13.camel@wdc.com>
Date:   Tue, 3 Oct 2017 20:13:26 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "pavel@....cz" <pavel@....cz>,
        "darrick.wong@...cle.com" <darrick.wong@...cle.com>,
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Subject: Re: [RFC 5/5] pm: remove kernel thread freezing

On Tue, 2017-10-03 at 11:53 -0700, Luis R. Rodriguez wrote:
> Now that all filesystems which used to rely on kthread
> freezing have been converted to filesystem freeze/thawing
> we can remove the kernel kthread freezer.

Many subsystems use system_freezable_wq and/or
system_freezable_power_efficient_wq to queue work that should not run while
processes are frozen. Should it be mentioned in the patch description that
this patch does not affect workqueues for which WQ_FREEZABLE has been set?

What about the many drivers outside filesystems that use the set_freezable() /
try_to_freeze() / wait_event_freezable() API?

Thanks,

Bart.