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

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Date:   Tue, 3 Oct 2017 23:07:55 +0200
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>, viro@...iv.linux.org.uk,
        bart.vanassche@....com, ming.lei@...hat.com, tytso@....edu,
        darrick.wong@...cle.com, jikos@...nel.org, rjw@...ysocki.net,
        pavel@....cz, len.brown@...el.com, linux-fsdevel@...r.kernel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        todd.e.brandt@...ux.intel.com, nborisov@...e.com, jack@...e.cz,
        martin.petersen@...cle.com, ONeukum@...e.com,
        oleksandr@...alenko.name, oleg.b.antonyan@...il.com,
        linux-pm@...r.kernel.org, linux-block@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 5/5] pm: remove kernel thread freezing

On Wed, Oct 04, 2017 at 08:04:49AM +1100, Dave Chinner wrote:
> On Tue, Oct 03, 2017 at 11:53:13AM -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.
> 
> Really? There's no other subsystem that relies on kernel thread
> and workqueue freezing to function correctly on suspend?

On my cover letter I noted this patch should not be consideredd
until *all* kthreads are vetted. So I agree vehemently with you.
The patch set only addressed 2 filesystem, so two kthreads. Much
other work would be needed before this lat patch could *ever*
be considered.

  Luis