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

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Message-ID: <87il6k1y82.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Thu, 02 Nov 2023 14:11:09 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Gregory Price <gourry.memverge@...il.com>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        aneesh.kumar@...ux.ibm.com, weixugc@...gle.com, apopple@...dia.com,
        tim.c.chen@...el.com, dave.hansen@...el.com, shy828301@...il.com,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        Gregory Price <gregory.price@...verge.com>
Subject: Re: [RFC PATCH v3 0/4] Node Weights and Weighted Interleave

Michal Hocko <mhocko@...e.com> writes:

> On Wed 01-11-23 10:21:47, Huang, Ying wrote:
>> Michal Hocko <mhocko@...e.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