linux-kernel - Re: [PATCH v1 2/6] memcg-v1: remove charge move code

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Message-ID: <f18fa492-5d59-4708-95f6-9878fffdf859@redhat.com>
Date: Mon, 28 Oct 2024 11:22:05 +0100
From: David Hildenbrand <david@...hat.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Muchun Song <muchun.song@...ux.dev>, Hugh Dickins <hughd@...gle.com>,
 Yosry Ahmed <yosryahmed@...gle.com>, linux-mm@...ck.org,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
 Meta kernel team <kernel-team@...a.com>, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v1 2/6] memcg-v1: remove charge move code

> -
> -	pgdat = folio_pgdat(folio);
> -	from_vec = mem_cgroup_lruvec(from, pgdat);
> -	to_vec = mem_cgroup_lruvec(to, pgdat);
> -
> -	folio_memcg_lock(folio);
> -
> -	if (folio_test_anon(folio)) {
> -		if (folio_mapped(folio)) {
> -			__mod_lruvec_state(from_vec, NR_ANON_MAPPED, -nr_pages);
> -			__mod_lruvec_state(to_vec, NR_ANON_MAPPED, nr_pages);

Good, because this code was likely wrong :) (-> partially mapped anon 
folios)


-- 
Cheers,

David / dhildenb