On 2016/04/15 0:14, Petr Mladek wrote:
> This patch converts hungtaskd() in kthread worker API because
> it modifies the priority.
>
> This patch moves one iteration of the main cycle into a self-queuing
> delayed kthread work. It does not longer check if it was called
> earlier. Instead, the work is scheduled only when needed. This
> requires storing the time of the last check into a global
> variable.
Is it guaranteed that that work is fired when timeout expires? It is
common that tasks sleep in uninterruptible state due to waiting for
memory allocations. Unless a dedicated worker like vmstat_wq is used
for watchdog, I think it might fail to report such tasks due to all
workers being busy but the system is under OOM.
vmstat_wq = alloc_workqueue("vmstat", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
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