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

[Hannes Reinecke]

On 10/03/2017 08:53 PM, 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.
> 
> Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
> ---
>  Documentation/power/freezing-of-tasks.txt |  9 ------
>  drivers/xen/manage.c                      |  6 ----
>  include/linux/freezer.h                   |  4 ---
>  kernel/power/hibernate.c                  | 10 ++-----
>  kernel/power/power.h                      | 20 +------------
>  kernel/power/process.c                    | 47 -------------------------------
>  kernel/power/user.c                       |  9 ------
>  tools/power/pm-graph/analyze_suspend.py   |  1 -
>  8 files changed, 3 insertions(+), 103 deletions(-)
> 
Weelll ... have you checked MD?
It's using kernel threads, which probably should be stopped, too, when
going into suspend. After all, MD might be doing on of it's internal
operations (eg resync) at that time, which will generate quite some I/O.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
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