Re: [PATCH v1 14/14] mm: multigenerational lru: documentation

[Alex Shi]

在 2021/3/13 下午3:57, Yu Zhao 写道:
> +Recipes
> +-------
> +:Android on ARMv8.1+: ``X=4``, ``N=0``
> +
> +:Android on pre-ARMv8.1 CPUs: Not recommended due to the lack of
> + ``ARM64_HW_AFDBM``
> +
> +:Laptops running Chrome on x86_64: ``X=7``, ``N=2``
> +
> +:Working set estimation: Write ``+ memcg_id node_id gen [swappiness]``
> + to ``/sys/kernel/debug/lru_gen`` to account referenced pages to
> + generation ``max_gen`` and create the next generation ``max_gen+1``.
> + ``gen`` must be equal to ``max_gen`` in order to avoid races. A swap
> + file and a non-zero swappiness value are required to scan anon pages.
> + If swapping is not desired, set ``vm.swappiness`` to ``0`` and
> + overwrite it with a non-zero ``swappiness``.
> +
> +:Proactive reclaim: Write ``- memcg_id node_id gen [swappiness]
> + [nr_to_reclaim]`` to ``/sys/kernel/debug/lru_gen`` to evict
> + generations less than or equal to ``gen``. ``gen`` must be less than
> + ``max_gen-1`` as ``max_gen`` and ``max_gen-1`` are active generations
> + and therefore protected from the eviction. ``nr_to_reclaim`` can be
> + used to limit the number of pages to be evicted. Multiple command
> + lines are supported, so does concatenation with delimiters ``,`` and
> + ``;``.
> +


These are difficult options for users, especially for 'races' involving.
Is it possible to simplify them for end users?

Thanks
Alex