On Mon, Aug 18, 2025 at 05:36:56PM -0700, Boris Burkov wrote:
> Commit a4055888629bc ("mm/memcg: warning on !memcg after readahead page
> charged") added the warning in folio_lruvec (older name was
> mem_cgroup_page_lruvec) for !memcg when charging of readahead pages were
> added to the kernel. Basically lru pages on a memcg enabled system were
> always expected to be charged to a memcg.
>
> However a recent functionality to allow metadata of btrfs, which is in
> page cache, to be uncharged is added to the kernel. We can either change
> the condition to only check anon pages or file pages which does not have
> AS_UNCHARGED in their mapping. Instead of such complicated check, let's
> just remove the warning as it is not really helpful anymore.
This has to go before patch 3 (and I'd put it before patch 1) in order
to preserve bisectability.. That requires changing the tenses in the
commit message, but that's perfectly acceptable.
