[RFC 2/3] mm: introduce GCMA

[Christoph Hellwig]

On Thu, Mar 20, 2025 at 10:39:30AM -0700, Suren Baghdasaryan wrote:
> From: Minchan Kim <minchan at google.com>
> 
> This patch introduces GCMA (Guaranteed Contiguous Memory Allocator)
> cleacache backend which reserves some amount of memory at the boot
> and then donates it to store clean file-backed pages in the cleancache.
> GCMA aims to guarantee contiguous memory allocation success as well as
> low and deterministic allocation latency.
> 
> Notes:
> Originally, the idea was posted by SeongJae Park and Minchan Kim [1].
> Later Minchan reworked it to be used in Android as a reference for
> Android vendors to use [2].

That is not a very good summay.  It needs to explain how you ensure
that the pages do stay clean forever.