** Changed in: linux-gke (Ubuntu)
Assignee: (unassigned) => Ian Whitfield (ijwhitfield)
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https://bugs.launchpad.net/bugs/2113905
Title:
Compile multi-gen LRU in kernel but keep it disabled by default
Status in linux-gke package in Ubuntu:
New
Status in linux-gke source package in Noble:
New
Bug description:
SRU Justification
[Impact]
Google has previously requested multi-gen LRU to be disabled due to a bug
(see https://bugs.launchpad.net/bugs/2084716), however, this prevents customers
from opting into usage of multi-gen LRU at all. This bug requests that
multi-gen LRU be built into the kernel, but be disabled by default, such that
users can opt-in as needed.
[Fix]
Set CONFIG_LRU_GEN=y and CONFIG_LRU_GEN_ENABLED=n.
[Test Plan]
Google has provided the expected output:
$ cat /boot/config-$(uname -r) | grep LRU
CONFIG_LRU_GEN=y
# CONFIG_LRU_GEN_ENABLED is not set
# CONFIG_LRU_GEN_STATS is not set
Based on the docs here:
https://docs.kernel.org/next/admin-guide/mm/multigen_lru.html
You can also check this module is available but disabled by verifying this
output:
$ cat /sys/kernel/mm/lru_gen/enabled
0x0000
[Where problems could occur]
The only expected change in behavior is that multi-gen LRU is available for
customers, but the default behavior should be identical. By having this module
available, it's possible that the bug responsible for originally disabling
multi-gen LRU could come up again, but it should only impact customers that
opt-in.
[Other]
PIT: 421036236
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