ACK: [SRU][N:linux-gke][PATCH v2 0/1] Compile multi-gen LRU in kernel but keep it disabled by default

[Edoardo Canepa]

On 11/06/25 18:01, Ian Whitfield wrote:
> BugLink: https://bugs.launchpad.net/bugs/2113905
>
> [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 patchset builds multi-gen LRU into the kernel, but 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 the 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.
>
> v2: Added description of the change to the commit message.
>
> Ian Whitfield (1):
>    UBUNTU: [Config] gke: Build multi-gen LRU but leave it disabled
>
>   debian.gke/config/annotations | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
>
Acked-by: Edoardo Canepa <edoardo.canepa at canonical.com>
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