Re: [PATCH -next RFC 0/2] cpuset: Add cpuset.mems.spread_page to cgroup v2

[Cai Xinchen <caixinchen1@huawei.com>]

I tried using memory.max, but clearing the page cache caused performance 
degradation. The MPOL_INTERLEAVE setting requires restarting the 
DataNode service. In this scenario, the issue can be resolved by 
restarting the service, but I would prefer not to restart the DataNode 
service if possible, as it would cause a period of service interruption.

On 9/30/2025 8:05 PM, Michal Koutný wrote:
> Hello Xinchen.
>
> On Tue, Sep 30, 2025 at 09:35:50AM +0000, Cai Xinchen <caixinchen1@huawei.com> wrote:
>> I discovered that the DataNode process had requested a large amount
>> of page cache. most of the page cache was concentrated in one NUMA node,
>> ultimately leading to the exhaustion of memory in that NUMA node.
> [...]
>> This issue can be resolved by migrating the DataNode into
>> a cpuset, dropping the cache, and setting cpuset.memory_spread_page to
>> allow it to evenly request memory.
> Would it work in your case instead to apply memory.max or apply
> MPOL_INTERLEAVE to DataNode process?
>
> In anyway, please see commit 012c419f8d248 ("cgroup/cpuset-v1: Add
> deprecation messages to memory_spread_page and memory_spread_slab")
> since your patchset would need to touch that place(s) too.
>
> Thanks,
> Michal