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[109.81.31.149]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b919e7372sm7234784f8f.34.2026.03.26.00.14.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Mar 2026 00:14:37 -0700 (PDT) Date: Thu, 26 Mar 2026 08:14:36 +0100 From: Michal Hocko To: Qi Zheng Cc: 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, harry.yoo@oracle.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 Subject: Re: [PATCH v2 0/4] fix unexpected type conversions and potential overflows Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5CF3E2000B X-Stat-Signature: ob6s1qk3ikm1t6mch9cammy85spiei6s X-Rspam-User: X-HE-Tag: 1774509279-98381 X-HE-Meta: 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 yMybmQcg GIrWp4Wj1ndh7Kn1vO30iyR0h3SPhtYNxECBsFIz+3UXKrqX+dcsmOHshdOAhdqoFap6TsZnWYjNLtVlFrWjCj/Zej3A8NHNu7Lb56gbI9nv4ERaFYCGDgZawoNvGWJNwygerQNlPrPcR6N1DLg26hqBMdPP++c4ZiKzDswBUioUQT7+8sNii7Iserz1wywEupeVKimYdThzHrzx/sdt+frIx8EEN02x4dZX+hXOwx+u0Ab7czPAOY2avAAqIArkROhZv4mHWmyjDwFLXMs9Fne+t582aKWvs2LIWTEMpFmFyXkiv6p+pH0VauhBfO0wExldClgBO7pRXolBA2QredYRlp3yc8CslnkN9GQF/gm7Qy2hgPTtun3Q1Fadi6et8B9TL Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed 25-03-26 22:13:21, Qi Zheng wrote: > From: Qi Zheng > > 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? -- Michal Hocko SUSE Labs