Re: [RFC PATCH v3 0/4] Node Weights and Weighted Interleave

Huang, Ying
2023-11-02T06:18:10Z

Michal Hocko <mhocko@suse.com> writes:

> On Wed 01-11-23 10:21:47, Huang, Ying wrote:
>> Michal Hocko <mhocko@suse.com> writes:
> [...]
>> > Well, I am not convinced about that TBH. Sure it is probably a good fit
>> > for this specific CXL usecase but it just doesn't fit into many others I
>> > can think of - e.g. proportional use of those tiers based on the
>> > workload - you get what you pay for.
>>
>> For "pay", per my understanding, we need some cgroup based
>> per-memory-tier (or per-node) usage limit. The following patchset is
>> the first step for that.
>>
>> https://lore.kernel.org/linux-mm/cover.1655242024.git.tim.c.chen@linux.intel.com/
>
> Why do we need a sysfs interface if there are plans for cgroup API?

They are for different target. The cgroup API proposed here is to
constrain the DRAM usage in a system with DRAM and CXL memory. The less
you pay, the less DRAM and more CXL memory you use.

--
Best Regards,
Huang, Ying