From: "Luis R. Rodriguez" <mcgrof@kernel.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>,
viro@zeniv.linux.org.uk, bart.vanassche@wdc.com,
ming.lei@redhat.com, tytso@mit.edu, darrick.wong@oracle.com,
jikos@kernel.org, rjw@rjwysocki.net, len.brown@intel.com,
linux-fsdevel@vger.kernel.org, boris.ostrovsky@oracle.com,
jgross@suse.com, todd.e.brandt@linux.intel.com,
nborisov@suse.com, jack@suse.cz, martin.petersen@oracle.com,
ONeukum@suse.com, oleksandr@natalenko.name,
oleg.b.antonyan@gmail.com, linux-pm@vger.kernel.org,
linux-block@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC 5/5] pm: remove kernel thread freezing
Date: Tue, 3 Oct 2017 22:49:40 +0200 [thread overview]
Message-ID: <20171003204940.GA5659@wotan.suse.de> (raw)
In-Reply-To: <20171003201204.GA23521@amd>
On Tue, Oct 03, 2017 at 10:12:04PM +0200, Pavel Machek wrote:
> On Tue 2017-10-03 11:53:13, 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.
>
> Are you surely-sure? You mentioned other in kernel sources of writes;
> what about those?
You perhaps did not read the cover letter, it describes this patch will very
likely take time to *ever* apply. We must cover tons of grounds first, to
address precisely what you say.
In fact other than kthreads that generate IO we may have now even crazy stupid
kthreads using the freezer API which *do not generate IO* which are totally
bogus but now acts as "features". We'll need to carefully carve out all freezer
API uses on all kthreads. This should be done atomically to avoid regressions
and ensure bisectability.
Luis
next prev parent reply other threads:[~2017-10-03 20:49 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 18:53 [RFC 0/5] fs: replace kthread freezing with filesystem freeze/thaw Luis R. Rodriguez
2017-10-03 18:53 ` [RFC 1/5] fs: add iterate_supers_reverse() Luis R. Rodriguez
2017-10-03 18:53 ` [RFC 2/5] fs: freeze on suspend and thaw on resume Luis R. Rodriguez
2017-10-03 20:02 ` Bart Van Assche
2017-10-03 20:23 ` Luis R. Rodriguez
2017-10-03 20:32 ` Bart Van Assche
2017-10-03 20:39 ` Luis R. Rodriguez
2017-10-03 20:06 ` Jiri Kosina
2017-10-03 20:58 ` Dave Chinner
2017-10-03 21:16 ` Luis R. Rodriguez
2017-10-03 18:53 ` [RFC 3/5] xfs: allow fs freeze on suspend/hibernation Luis R. Rodriguez
2017-10-03 18:53 ` [RFC 4/5] ext4: add fs freezing support " Luis R. Rodriguez
2017-10-03 19:59 ` Theodore Ts'o
2017-10-03 20:13 ` Luis R. Rodriguez
2017-10-04 1:42 ` Theodore Ts'o
2017-10-04 7:05 ` Dave Chinner
2017-10-04 15:25 ` Bart Van Assche
2017-10-04 15:25 ` Bart Van Assche
2017-10-04 16:48 ` Theodore Ts'o
2017-10-04 22:22 ` Dave Chinner
2017-10-03 18:53 ` [RFC 5/5] pm: remove kernel thread freezing Luis R. Rodriguez
2017-10-03 18:59 ` Rafael J. Wysocki
2017-10-03 21:15 ` Rafael J. Wysocki
2017-10-04 0:47 ` Luis R. Rodriguez
2017-10-04 1:03 ` Bart Van Assche
2017-11-29 23:05 ` Luis R. Rodriguez
2017-10-04 7:18 ` Dave Chinner
2017-10-03 20:12 ` Pavel Machek
2017-10-03 20:15 ` Jiri Kosina
2017-10-03 20:21 ` Pavel Machek
2017-10-03 20:38 ` Jiri Kosina
2017-10-03 20:41 ` Rafael J. Wysocki
2017-10-03 20:57 ` Pavel Machek
2017-10-03 21:00 ` Jiri Kosina
2017-10-03 21:09 ` Shuah Khan
2017-10-03 21:18 ` Luis R. Rodriguez
2017-10-03 20:49 ` Luis R. Rodriguez [this message]
2017-10-06 12:07 ` Pavel Machek
2017-10-06 12:54 ` Theodore Ts'o
2017-10-03 20:13 ` Bart Van Assche
2017-10-03 20:17 ` Jiri Kosina
2017-10-03 20:21 ` Bart Van Assche
2017-10-03 20:24 ` Jiri Kosina
2017-10-03 20:27 ` Luis R. Rodriguez
2017-10-03 20:51 ` Jiri Kosina
2017-10-03 21:04 ` Dave Chinner
2017-10-03 21:07 ` Luis R. Rodriguez
2017-10-04 6:07 ` Hannes Reinecke
2017-10-03 19:33 ` [RFC 0/5] fs: replace kthread freezing with filesystem freeze/thaw Ming Lei
2017-10-03 20:05 ` Luis R. Rodriguez
2017-10-03 20:47 ` Matthew Wilcox
2017-10-03 20:54 ` Luis R. Rodriguez
2017-10-03 20:59 ` Bart Van Assche
2017-10-04 15:43 ` Ming Lei
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