From: "Oscar Salvador (SUSE)" <osalvador@kernel.org>
To: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Hongfu Li <hongfu.li@linux.dev>,
Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
David Hildenbrand <david@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Shakeel Butt <shakeel.butt@linux.dev>,
Michal Hocko <mhocko@suse.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Nhat Pham <nphamcs@gmail.com>, Chris Down <chris@chrisdown.name>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, Hongfu Li <lihongfu@kylinos.cn>,
stable@vger.kernel.org
Subject: Re: [PATCH 2/2] mm/memcg: migrate per-node hugetlb lruvec stat together with hugetlb folio
Date: Tue, 22 Sep 2026 06:30:52 +0200 [thread overview]
Message-ID: <arIEfJXYpspgX4-G@localhost.localdomain> (raw)
In-Reply-To: <20260922042054.3264663-1-joshua.hahnjy@gmail.com>
On Mon, Sep 21, 2026 at 09:20:53PM -0700, Joshua Hahn wrote:
> On Tue, 22 Sep 2026 06:15:07 +0200 "Oscar Salvador (SUSE)" <osalvador@kernel.org> wrote:
> > Why do we need the whole thing to be embraced by rcu?
>
> Hi Oscar,
Hi Joshua,
>
> I believe it's because now getting the memcg from the objcg requires
> an RCU lock to make sure it doesn't get removed while we work on the
> memcg. I think this is since Qi Zheng's "Eliminate Dying Memory
> Cgroup" series.
Yes, I understood that obj_cgroup_memcg might need the rcu-dance, but I was
unsure about the mod_memcg_lruvec_state() calls.
--
Oscar Salvador
SUSE Labs
next prev parent reply other threads:[~2026-09-22 4:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-21 9:12 [PATCH 0/2] mm: fix hugetlb NR_HUGETLB accounting on folio migration Hongfu Li
2026-09-21 9:12 ` [PATCH 1/2] mm/hugetlb: account migration target folio in per-node NR_HUGETLB vmstat Hongfu Li
2026-09-21 22:35 ` Joshua Hahn
2026-09-22 3:34 ` Muchun Song
2026-09-22 3:33 ` Muchun Song
2026-09-22 4:04 ` Oscar Salvador (SUSE)
2026-09-21 9:12 ` [PATCH 2/2] mm/memcg: migrate per-node hugetlb lruvec stat together with hugetlb folio Hongfu Li
2026-09-21 23:03 ` Joshua Hahn
2026-09-22 4:15 ` Oscar Salvador (SUSE)
2026-09-22 4:20 ` Joshua Hahn
2026-09-22 4:30 ` Oscar Salvador (SUSE) [this message]
2026-09-22 6:31 ` Muchun Song
2026-09-22 6:18 ` Muchun Song
2026-09-22 9:38 ` Hongfu Li
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