An MGLRU Performance Regression Fix Is On The Way Plus Another Optimization

[nuetzel]

To see if it is enabled use the following:

cat /sys/kernel/mm/lru_gen/enabled

if this is 0 mglru is disabled 1 up to 7 means it is enabled, 7 is with all features on, for exact specifications, read the documentation. Most users should enable all functions.
To enable mglru with all functions on use the following as root:

echo y >/sys/kernel/mm/lru_gen/enabled

To disable substitute y with 0, to limit functionality substitute y with a number between 1 and 7

And what's up with this?:

echo 1000 > /sys/kernel/mm/lru_gen/min_ttl_ms

[FPScholten]

And what's up with this?:

echo 1000 > /sys/kernel/mm/lru_gen/min_ttl_ms

Try actually reading the documentation...

Thrashing prevention
--------------------
Personal computers are more sensitive to thrashing because it can
cause janks (lags when rendering UI) and negatively impact user
experience. The multi-gen LRU offers thrashing prevention to the
majority of laptop and desktop users who do not have ``oomd``.

Users can write ``N`` to ``min_ttl_ms`` to prevent the working set of
``N`` milliseconds from getting evicted. The OOM killer is triggered
if this working set cannot be kept in memory. In other words, this
option works as an adjustable pressure relief valve, and when open, it
terminates applications that are hopefully not being used.

Based on the average human detectable lag (~100ms), ``N=1000`` usually
eliminates intolerable janks due to thrashing. Larger values like
``N=3000`` make janks less noticeable at the risk of premature OOM
kills.

The default value ``0`` means disabled.