From: "Harry Yoo (Oracle)" <harry@kernel.org>
To: Michal Hocko <mhocko@suse.com>
Cc: Qi Zheng <qi.zheng@linux.dev>,
hannes@cmpxchg.org, hughd@google.com, roman.gushchin@linux.dev,
shakeel.butt@linux.dev, muchun.song@linux.dev, david@kernel.org,
ljs@kernel.org, ziy@nvidia.com, yosry.ahmed@linux.dev,
imran.f.khan@oracle.com, kamalesh.babulal@oracle.com,
axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com,
chenridong@huaweicloud.com, mkoutny@suse.com,
akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com,
apais@linux.microsoft.com, lance.yang@linux.dev, bhe@redhat.com,
usamaarif642@gmail.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Qi Zheng <zhengqi.arch@bytedance.com>
Subject: Re: [PATCH v2 0/4] fix unexpected type conversions and potential overflows
Date: Thu, 26 Mar 2026 16:51:44 +0900 [thread overview]
Message-ID: <acTlkB9WOGzVJCEo@hyeyoo> (raw)
In-Reply-To: <acTc3JugF71I9Eep@tiehlicka>
On Thu, Mar 26, 2026 at 08:14:36AM +0100, Michal Hocko wrote:
> On Wed 25-03-26 22:13:21, Qi Zheng wrote:
> > From: Qi Zheng <zhengqi.arch@bytedance.com>
> >
> > Hi all,
> >
> > As Harry Yoo pointed out [1], in scenarios where massive state updates occur
> > (e.g., during the reparenting of LRU folios), the values passed to memcg stat
> > update functions can accumulate and exceed the upper limit of a 32-bit integer.
>
> Is this a real problem without reparenting? In other words is this a
> follow up for that work or something that we need on its own?
This is not a problem (as discussed in [1]) without reparenting.
[1] https://lore.kernel.org/linux-mm/138d9363-ab0c-4f5c-bedc-b326f5aaee91@linux.dev
--
Cheers,
Harry / Hyeonggon
next prev parent reply other threads:[~2026-03-26 7:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-25 14:13 [PATCH v2 0/4] fix unexpected type conversions and potential overflows Qi Zheng
2026-03-25 14:13 ` [PATCH v2 1/4] mm: memcontrol: correct the type of stats_updates to unsigned long Qi Zheng
2026-03-25 15:28 ` Lorenzo Stoakes (Oracle)
2026-03-26 2:32 ` Qi Zheng
2026-03-26 8:05 ` Lorenzo Stoakes (Oracle)
2026-03-26 8:19 ` Harry Yoo (Oracle)
2026-03-26 8:20 ` Qi Zheng
2026-03-25 14:13 ` [PATCH v2 2/4] mm: memcontrol: change val type to long in __mod_memcg_{lruvec_}state() Qi Zheng
2026-03-26 9:19 ` Lorenzo Stoakes (Oracle)
2026-03-26 14:37 ` David Laight
2026-03-25 14:13 ` [PATCH v2 3/4] mm: memcontrol: correct the nr_pages parameter type of mem_cgroup_update_lru_size() Qi Zheng
2026-03-25 14:13 ` [PATCH v2 4/4] mm: memcontrol: fix unexpected massive positive number in memcg_state_val_in_pages() Qi Zheng
2026-03-26 9:16 ` Lorenzo Stoakes (Oracle)
2026-03-26 9:21 ` Lorenzo Stoakes (Oracle)
2026-03-26 9:32 ` Qi Zheng
2026-03-26 9:38 ` Lorenzo Stoakes (Oracle)
2026-03-25 14:24 ` [PATCH v2 0/4] fix unexpected type conversions and potential overflows Qi Zheng
2026-03-25 23:57 ` Andrew Morton
2026-03-26 0:28 ` Andrew Morton
2026-03-26 2:30 ` Qi Zheng
2026-03-26 3:27 ` Andrew Morton
2026-03-26 7:14 ` Michal Hocko
2026-03-26 7:51 ` Harry Yoo (Oracle) [this message]
2026-03-26 8:18 ` Michal Hocko
2026-03-26 9:22 ` Lorenzo Stoakes (Oracle)
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