Re: [RFC v2] mm: add page preemption

[Johannes Weiner]

On Sat, Oct 26, 2019 at 07:28:08PM +0800, Hillf Danton wrote:
> 
> The cpu preemption feature makes a task able to preempt other tasks
> of lower priorities for cpu. It has been around for a while.
> 
> This work introduces task prio into page reclaiming in order to add
> the page preemption feature that makes a task able to preempt other
> tasks of lower priorities for page.
> 
> No page will be reclaimed on behalf of tasks of lower priorities

... at which point they'll declare OOM and kill the high-pri task?

Please have a look at the cgroup2 memory.low control. This memory
prioritization problem has already been solved.