From: Shuah Khan <shuahkhan@gmail.com>
To: Jiri Kosina <jikos@kernel.org>, mchehab@s-opensource.com
Cc: Pavel Machek <pavel@ucw.cz>,
"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,
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 list <linux-pm@vger.kernel.org>,
linux-block@vger.kernel.org, linux-xfs@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
linux-media@vger.kernel.org, shuahkh@osg.samsung.com
Subject: Re: [RFC 5/5] pm: remove kernel thread freezing
Date: Tue, 3 Oct 2017 15:09:53 -0600 [thread overview]
Message-ID: <CAKocOOM6M5HbTA24wStNFnOTVR6vHc76h6cXT=OcMV2e3XSy9w@mail.gmail.com> (raw)
In-Reply-To: <nycvar.YFH.7.76.1710032258540.17517@jbgna.fhfr.qr>
On Tue, Oct 3, 2017 at 3:00 PM, Jiri Kosina <jikos@kernel.org> wrote:
> On Tue, 3 Oct 2017, Pavel Machek wrote:
>
>> > Again, I agree that the (rare) kthreads that are actually "creating" new
>> > I/O have to be somehow frozen and require special care.
>>
>> Agreed. Was any effort made to identify those special kernel threads?
>
> I don't think there is any other way than just inspecting all the
> try_to_freeze() instances in the kernel, and understanding what that
> particular kthread is doing.
>
> I've cleaned up most of the low-hanging fruit already, where the
> try_to_freeze() was obviously completely pointless, but a lot more time
> needs to be invested into this.
>
There are about 36 drivers that call try_to_freeze() and half (18 ) of
those are media drivers. Maybe it is easier handle sub-system by
sub-system basis for a review of which one of these usages could be
removed. cc'ing Mauro and linux-media
thanks,
-- Shuah
next prev parent reply other threads:[~2017-10-03 21:09 UTC|newest]
Thread overview: 53+ 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 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 [this message]
2017-10-03 21:18 ` Luis R. Rodriguez
2017-10-03 20:49 ` Luis R. Rodriguez
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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