Re: [PATCH 0/3] Suppress undesirable hung task warnings.

[Michal Hocko <mhocko@suse.com>]

On Mon 22-09-25 17:41:43, Julian Sun wrote:
> As suggested by Andrew Morton in [1], we need a general mechanism 

what is the reference?

> that allows the hung task detector to ignore unnecessary hung 
> tasks. This patch set implements this functionality.
> 
> Patch 1 introduces a PF_DONT_HUNG flag. The hung task detector will 
> ignores all tasks that have the PF_DONT_HUNG flag set.
> 
> Patch 2 introduces wait_event_no_hung() and wb_wait_for_completion_no_hung(), 
> which enable the hung task detector to ignore hung tasks caused by these
> wait events.
> 
> Patch 3 uses wb_wait_for_completion_no_hung() in the final phase of memcg 
> teardown to eliminate the hung task warning.
> 
> Julian Sun (3):
>   sched: Introduce a new flag PF_DONT_HUNG.
>   writeback: Introduce wb_wait_for_completion_no_hung().
>   memcg: Don't trigger hung task when memcg is releasing.
> 
>  fs/fs-writeback.c           | 15 +++++++++++++++
>  include/linux/backing-dev.h |  1 +
>  include/linux/sched.h       | 12 +++++++++++-
>  include/linux/wait.h        | 15 +++++++++++++++
>  kernel/hung_task.c          |  6 ++++++
>  mm/memcontrol.c             |  2 +-
>  6 files changed, 49 insertions(+), 2 deletions(-)
> 
> -- 
> 2.39.5

-- 
Michal Hocko
SUSE Labs