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([23.254.208.9]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36081bafa7asm30069333eec.14.2026.10.19.01.53.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Oct 2026 01:53:32 -0700 (PDT) From: Qiliang Yuan To: Andrew Morton Cc: Kairui Song , Qi Zheng , Shakeel Butt , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Brendan Jackman , Johannes Weiner , Zi Yan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: Re: [PATCH 0/2] mm/compaction: stop repeating failed async compaction on every THP fault Date: Mon, 19 Oct 2026 16:53:24 +0800 Message-ID: <20261019085324.2562579-1-odys.yuan@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261001-bug-mm-thp-async-compact-defer-v1-0-0174c7923430@gmail.com> References: <20261001-bug-mm-thp-async-compact-defer-v1-0-0174c7923430@gmail.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, A real workload has since run into the stall this series is about. Mooncake, the KV cache store used with vLLM and SGLang, backs each rank's host segment with MADV_HUGEPAGE memory and registers it with the EFA NIC, which pins it long-term. Its commit message [1] says: "under the default local NUMA policy every THP fault on a full node runs direct compaction before falling back. With 8 ranks x 190GB this made registration take ~38 minutes." They worked around it by binding the segment MPOL_INTERLEAVE across all allowed nodes, so no node fills before the others. That gives up node-local placement, and a task that sets its own policy still gets the stall. [1] https://github.com/kvcache-ai/Mooncake/commit/c3fa13ecaf1038df933dcb784ff8ffe026381100 Thanks, Qiliang