Re: [PATCH RFC] fs: drop_caches: introduce per-node drop_caches interface

Kefeng Wang
2026-04-09T08:55:19Z

On 4/9/2026 4:22 PM, Michal Hocko wrote:
> On Thu 09-04-26 16:08:37, Kefeng Wang wrote:
> [...]
>> To use the reclaim interface, there are two differences,
>>
>> 1) we need to input the reclaim numbers and swappiness, this is not a big
>> problem
>> 2) for reclaim, it supports swappiness=max to only reclaim anonymous pages,
>> but cannot only reclaim file pages,
>
> Why is 2) a real constrain?

This should not be a restriction, but a strategy. Our product wants to
migrate anonymous pages to the local instead of swapping them out.
However, the current per-node-reclaim interface does not support
reclaiming only file pages.