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From: Shakeel Butt To: Qi Zheng Cc: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, muchun.song@linux.dev, david@kernel.org, lorenzo.stoakes@oracle.com, 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, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Qi Zheng Subject: Re: [PATCH v4 25/31] mm: vmscan: prepare for reparenting traditional LRU folios Message-ID: References: <26efe2997261631c951d326bef6a20fe0796c43c.1770279888.git.zhengqi.arch@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <26efe2997261631c951d326bef6a20fe0796c43c.1770279888.git.zhengqi.arch@bytedance.com> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: zyx85wmwbj95m7geymc3d18este7qe64 X-Rspamd-Queue-Id: 00E4AC0002 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1770427718-771387 X-HE-Meta: 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 vbswPNrv CW0NuamP8PhHHPG2XuCpEkhc3xSrmhJDGeRM39JNMl9U4+w8WJpPFoYRNNnz8aX3jPDu5egv0zS5nNkF2KUTr5XxcPpu4Lbht78XVemSpa8N6uvfhHc3FgJKC/woMply1TOc4vQ9PlV3Hmh/L1OqQFN+pCmyPGOzyvtH9vGSE7YI6buX14JBNVT0n6anF+6WDp9p5DFlvfCBQnFIan10w02C3k4KS8jtafhO4kxFyZLdd+wEqyCDslXb67Q5kh84wr6CSEq9OZE5RX/DVlNpuJrWyaHfiF66+SkdpqNaIUjkQtDIaD1DEsJck5jsCH6BZNTBqi2dAPypArhtMBYXdBv0E6g== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Feb 05, 2026 at 05:01:44PM +0800, Qi Zheng wrote: > From: Qi Zheng > > To resolve the dying memcg issue, we need to reparent LRU folios of child > memcg to its parent memcg. For traditional LRU list, each lruvec of every > memcg comprises four LRU lists. Due to the symmetry of the LRU lists, it > is feasible to transfer the LRU lists from a memcg to its parent memcg > during the reparenting process. > > This commit implements the specific function, which will be used during > the reparenting process. > > Signed-off-by: Qi Zheng > Reviewed-by: Harry Yoo > Acked-by: Johannes Weiner > Acked-by: Muchun Song Acked-by: Shakeel Butt