Re: [PATCH v4 17/17] Documentation/mm: multi-gen LRU: update for frequency guided promotion

[sashiko-bot@kernel.org]

> From: Kairui Song <kasong@tencent.com>
> 
> The design doc still describes the old tier and promotion model:
> 
> - Tiers are no longer order_base_2() of the file descriptor accesses.
>   A folio's tier is derived from its referenced count, which counts
>   accesses from both page tables and file descriptors.
> 
> - A young PTE no longer always promotes a folio to the newest
>   generation.  The first access only moves a folio one generation
>   forward if it is at the tail of its LRU, i.e., in one of the two
>   oldest generations of its type, a second access promotes it, and
>   executable file folios are promoted on their first access.
> 
> - The eviction no longer uses the first tier as the only baseline.
>   The type is selected by comparing all tiers of each type, and a tier
>   is protected by comparing it against the tiers below it.
> 
> Update the aging and eviction sections accordingly.
> 
> Assisted-by: LLM
> Signed-off-by: Kairui Song <kasong@tencent.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261016-mglru-fg-v4-0-2106750c0bfa@tencent.com?part=17