From: <sthanneeru.opensrc@micron.com>
To: <aneesh.kumar@linux.ibm.com>, <hannes@cmpxchg.org>,
<hasanalmaruf@fb.com>, <haowang3@fb.com>, <ying.huang@intel.com>,
<gregory.price@memverge.com>, <dan.j.williams@intel.com>,
<mhocko@suse.com>, <tj@kernel.org>,
<hezhongkun.hzk@bytedance.com>, <fvdl@google.com>,
<john@jagalactic.com>, <mirakhur@micron.com>,
<vtavarespetr@micron.com>, <Ravis.OpenSrc@micron.com>,
<Jonathan.Cameron@huawei.com>, <linux-kernel@vger.kernel.org>,
<linux-api@vger.kernel.org>
Cc: Srinivasulu Thanneeru <sthanneeru.opensrc@micron.com>
Subject: [RFC PATCH 0/2] Node migration between memory tiers
Date: Fri, 1 Dec 2023 03:18:56 +0530 [thread overview]
Message-ID: <20231130214858.1887-1-sthanneeru.opensrc@micron.com> (raw)
From: Srinivasulu Thanneeru <sthanneeru.opensrc@micron.com>
The memory tiers feature allows nodes with similar memory types
or performance characteristics to be grouped together in a
memory tier. However, there is currently no provision for
moving a node from one tier to another on demand.
This patch series aims to support node migration between tiers
on demand by sysadmin/root user using the provided sysfs for
node migration. Each tier has a start abstract distance(adistance)
and range.
To migrate a node to a tier, the corresponding node’s sysfs
adistance_offset is written with a value corresponding to
the tier’s adistance.
Example: Move node2 to memory tier5 from its default tier(i.e 4)
1. Check default values:
$cat /sys/devices/virtual/memory_tiering/memory_tier4/nodelist
0-2
$cat /sys/devices/system/node/node0/adistance_offset
0
$cat /sys/devices/system/node/node1/adistance_offset
0
$cat /sys/devices/system/node/node2/adistance_offset
0
2. Move node2 to tier5:
To move node2 from emory_tier4 (adistance=512) to
emory_tier5 (abstract=640), set the `adistance_offset` of
node 2 to 128 (i.e., 512 + 128 = 640).
Tier4 adistance start can be derved from tier-id
(i.e for tier4, 4 << 7 = 512).
$echo 128 > /sys/devices/system/node/node2/adistance_offset
$cat /sys/devices/system/node/node2/adistance_offset
128
3. Verify node2's tier id:
$cat /sys/devices/virtual/memory_tiering/memory_tier5/nodelist
2
$cat /sys/devices/virtual/memory_tiering/memory_tier4/nodelist
0-1
Srinivasulu Thanneeru (2):
base/node: Add sysfs for adistance_offset
memory tier: Support node migration between tiers
drivers/base/node.c | 51 +++++++++++++++++++++++
include/linux/memory-tiers.h | 11 +++++
include/linux/node.h | 6 +++
mm/memory-tiers.c | 79 ++++++++++++++++++++----------------
4 files changed, 113 insertions(+), 34 deletions(-)
--
2.25.1
next reply other threads:[~2023-11-30 21:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-30 21:48 sthanneeru.opensrc [this message]
2023-11-30 21:48 ` [RFC PATCH 1/2] base/node: Add sysfs for adistance_offset sthanneeru.opensrc
2023-11-30 21:48 ` [RFC PATCH 2/2] memory tier: Support node migration between tiers sthanneeru.opensrc
2023-12-04 8:52 ` [RFC PATCH 0/2] Node migration between memory tiers Huang, Ying
-- strict thread matches above, loose matches on Subject: below --
2023-11-30 22:04 sthanneeru.opensrc
2023-12-04 15:43 ` Michal Hocko
2023-12-05 8:51 [EXT] " Michal Hocko
2023-12-05 9:19 ` Ravi Jonnalagadda
2023-12-06 15:22 ` Michal Hocko
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