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c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1766714474; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=c3apVSvPnG1+S3WvVx8S92DNntMU7OvrUHe8CJCMSoE=; b=CDjWi6CXs/hWPx7auTJWCQM8z9+RuBOsGDAIHfYF9d5ItnegU/nSedqma3WRICR5BIt6al cdWkKgoVCX0fs+Tp/wB85Wxf9HRzInyOyb/7Tr8lHN+LsN/MrCqL09WDJ6W6sxdN83MyI7 zcRGPXev01tsAYwNHZV+dcMVhg/2Dck= Received: from mail.maildlp.com (unknown [172.19.163.198]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTPS id 4dcpjN1YqhzYQtdl for ; Fri, 26 Dec 2025 10:00:24 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 79BC340573 for ; Fri, 26 Dec 2025 10:01:05 +0800 (CST) Received: from [10.67.111.176] (unknown [10.67.111.176]) by APP4 (Coremail) with SMTP id gCh0CgC3ZfZg7E1paw8CBg--.52160S2; Fri, 26 Dec 2025 10:01:05 +0800 (CST) Message-ID: Date: Fri, 26 Dec 2025 10:01:03 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 09/28] buffer: prevent memory cgroup release in folio_alloc_buffers() To: Shakeel Butt , 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, imran.f.khan@oracle.com, kamalesh.babulal@oracle.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, mkoutny@suse.com, akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com, apais@linux.microsoft.com, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Muchun Song , Qi Zheng References: <63h3n6m5ek623nzq4pwkwkhu72jqjjastxgnsjuvrvwpevv57v@2ki32ihzx7lj> Content-Language: en-US From: Chen Ridong In-Reply-To: <63h3n6m5ek623nzq4pwkwkhu72jqjjastxgnsjuvrvwpevv57v@2ki32ihzx7lj> Content-Type: text/plain; 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To ensure safety, it will only be appropriate to >> hold the rcu read lock or acquire a reference to the memory cgroup >> returned by folio_memcg(), thereby preventing it from being released. >> >> In the current patch, the function get_mem_cgroup_from_folio() is >> employed to safeguard against the release of the memory cgroup. >> This serves as a preparatory measure for the reparenting of the >> LRU pages. >> >> Signed-off-by: Muchun Song >> Signed-off-by: Qi Zheng >> Reviewed-by: Harry Yoo > > Acked-by: Shakeel Butt Reviewed-by: Chen Ridong -- Best regards, Ridong