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[109.81.26.156]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-435e1323770sm45183583f8f.32.2026.02.02.05.15.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 05:15:22 -0800 (PST) Date: Mon, 2 Feb 2026 14:15:21 +0100 From: Michal Hocko To: Akinobu Mita Cc: Joshua Hahn , linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, hannes@cmpxchg.org, david@kernel.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, ziy@nvidia.com, matthew.brost@intel.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, bingjiao@google.com, jonathan.cameron@huawei.com, pratyush.brahma@oss.qualcomm.com Subject: Re: [PATCH v4 3/3] mm/vmscan: don't demote if there is not enough free memory in the lower memory tier Message-ID: References: <20260127220003.3993576-1-joshua.hahnjy@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: wfgw7957ct8bbi9uuf53mkpjpnjfcbg6 X-Rspamd-Queue-Id: 2C8A7100006 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1770038123-799648 X-HE-Meta: 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 2P7uH8i4 /9kxpeC9CGBByG9ymVACFUKZsvJKqW7Xd2Vh2O1opKYSKQGmnUD/qRpuV1sP6gJAUZvSCXiXS/0dYH75NWMsvNxTL8w0LNFCy+/GDGyEndM5AHmoZPHOJtxg8zbRhjDb0W7da+ADpoIM4JlR+SJgL8tzVY/GqoI1hG4DLXS5/eTiexvtDT8M7ALrsqhah1/N3h2vqa+tScQwG1lkGE+mJPRMyeacnpPx3SdOlK38WmIWI6Po3s3Nj8610jN812AZ6yjXXCIRInbBHbY0iamRwtlMokuDSMGdZKhfKMsH2c7HT0jOMU1MYkvbYKSb6l7e4Am2BHbFVmWUcDe/yNlyrsKBZI164/1MRhFOgEr/XK7zHLKs3fg8gGZ/0qht849JVtjLnxl0IJaYUGLLc5cVXQ4g9z2JKCpgPDreebnkhd7o93Wwcq+5zMffpniMRC3/U7tTTLSn+n+ChAMI= 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: Btw. collecting /proc/vmstat during this test could give you a better insight into what is going on. Especially reclaim stats (pgscan*, pgsteal*, pgdemote*, workingset*). -- Michal Hocko SUSE Labs