Re: [PATCH v5 4/9] binder: remove struct binder_lru_page

[Matthew Wilcox]

On Tue, Nov 26, 2024 at 06:40:07PM +0000, Carlos Llamas wrote:
> Remove the redundant struct binder_lru_page concept. Instead, let's use
> available struct page->lru and page->private members directly to achieve
> the same functionality. This reduces the maximum memory allocated for
> alloc->pages from 32768 down to 8192 bytes (aarch64). Savings are per
> binder instance.
> 
> Note that Matthew pointed out that some of the page members used in this
> patch (e.g. page->lru) are likely going to be removed in the near future
> [1]. Binder will adopt an alternative solution when this happens.

It's not just "near future".  page->index is going away if not next
merge window, then the merge window after.  page->mapping is going to
follow it, and page->lru after that.  Please find another way now.