Re: [External] Re: [PATCH] mm/memcontrol: Add the drop_cache interface for cgroup v2

[Chunxin Zang]

On Tue, Sep 22, 2020 at 8:43 PM Chris Down <chris@xxxxxxxxxxxxxx> wrote:
>
> Chunxin Zang writes:
> >Please forgive me for not being able to understand why setting
> >memory.low for Type_A can solve the problem.
> >In my scene, Type_A is the most important, so I will set 100G to memory.low.
> >But 'memory.low' only takes effect passively when the kernel is
> >reclaiming memory. It means that reclaim Type_B's memory only when
> >Type_A  in alloc memory slow path. This will affect Type_A's
> >performance.
> >We want to reclaim Type_B's memory in advance when A is expected to be busy.
>
> That's what kswapd reclaim is for, so this distinction is meaningless without
> measurements :-)

Thanks for these suggestions, I will give it a try.

Best wishes
Chunxin