From: Huang Ying <ying.huang@intel.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Wei Xu <weixugc@google.com>, Alistair Popple <apopple@nvidia.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@intel.com>,
Davidlohr Bueso <dave@stgolabs.net>,
Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Michal Hocko <mhocko@kernel.org>, Yang Shi <shy828301@gmail.com>,
Rafael J Wysocki <rafael.j.wysocki@intel.com>
Subject: [RFC 0/4] memory tiering: calculate abstract distance based on ACPI HMAT
Date: Fri, 16 Jun 2023 15:05:34 +0800 [thread overview]
Message-ID: <20230616070538.190042-1-ying.huang@intel.com> (raw)
We have the explicit memory tiers framework to manage systems with
multiple types of memory, e.g., DRAM in DIMM slots and CXL memory
devices. Where, same kind of memory devices will be grouped into
memory types, then put into memory tiers. To describe the performance
of a memory type, abstract distance is defined. Which is in direct
proportion to the memory latency and inversely proportional to the
memory bandwidth. To keep the code as simple as possible, fixed
abstract distance is used in dax/kmem to describe slow memory such as
Optane DCPMM.
To support more memory types, in this series, we added the abstract
distance calculation algorithm management mechanism, provided a
algorithm implementation based on ACPI HMAT, and used the general
abstract distance calculation interface in dax/kmem driver. So,
dax/kmem can support HBM (high bandwidth memory) in addition to the
original Optane DCPMM.
Best Regards,
Huang, Ying
next reply other threads:[~2023-06-16 7:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-16 7:05 Huang Ying [this message]
2023-06-16 7:05 ` [RFC 1/4] memory tiering: add abstract distance calculation algorithms management Huang Ying
2023-06-16 7:05 ` [RFC 2/4] acpi, hmat: refactor hmat_register_target_initiators() Huang Ying
2023-06-16 7:05 ` [RFC 3/4] acpi, hmat: calculate abstract distance with HMAT Huang Ying
2023-06-19 16:23 ` Aneesh Kumar K.V
2023-06-20 5:01 ` Huang, Ying
2023-06-16 7:05 ` [RFC 4/4] dax, kmem: calculate abstract distance with general interface Huang Ying
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