linux-kernel - Re: [PATCH] mm: do not update memcg stats for NR_{FILE/SHMEM}

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Message-ID: <d546b804-bb71-45c7-89c4-776f98a48e77@redhat.com>
Date: Mon, 6 May 2024 20:35:39 +0200
From: David Hildenbrand <david@...hat.com>
To: Yosry Ahmed <yosryahmed@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Shakeel Butt <shakeel.butt@...ux.dev>,
 Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Muchun Song <muchun.song@...ux.dev>, linux-mm@...ck.org,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzbot+9319a4268a640e26b72b@...kaller.appspotmail.com
Subject: Re: [PATCH] mm: do not update memcg stats for
 NR_{FILE/SHMEM}_PMDMAPPED

On 06.05.24 19:00, Yosry Ahmed wrote:
> Do not use __lruvec_stat_mod_folio() when updating NR_FILE_PMDMAPPED and
> NR_SHMEM_PMDMAPPED as these stats are not maintained per-memcg. Use
> __mod_node_page_state() instead, which updates the global per-node stats
> only.

What's the effect of this? IIUC, it's been that way forever, no?

Fixes: ?

Do we want to CC stable?


-- 
Cheers,

David / dhildenb