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From: Qiliang Yuan <odys.yuan@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Kairui Song <kasong@tencent.com>, Qi Zheng <qi.zheng@linux.dev>,
	Shakeel Butt <shakeel.butt@linux.dev>,
	Barry Song <baohua@kernel.org>,
	Axel Rasmussen <axelrasmussen@google.com>,
	Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
	Baoquan He <baoquan.he@linux.dev>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	David Hildenbrand <david@kernel.org>,
	Lorenzo Stoakes <ljs@kernel.org>,
	"Liam R. Howlett" <liam@infradead.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	Mike Rapoport <rppt@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Brendan Jackman <brendan.jackman@linux.dev>,
	Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
	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	[thread overview]
Message-ID: <20261019085324.2562579-1-odys.yuan@gmail.com> (raw)
In-Reply-To: <20261001-bug-mm-thp-async-compact-defer-v1-0-0174c7923430@gmail.com>

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

      parent reply	other threads:[~2026-10-19  8:53 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-01 15:33 Qiliang Yuan
2026-10-01 15:33 ` [PATCH 1/2] mm/compaction: keep compaction deferral state per migration mode Qiliang Yuan
2026-10-01 15:33 ` [PATCH 2/2] mm/compaction: defer failed async direct compaction Qiliang Yuan
2026-10-02 14:21 ` [PATCH 0/2] mm/compaction: stop repeating failed async compaction on every THP fault Lorenzo Stoakes (ARM)
2026-10-02 16:17   ` Qiliang Yuan
2026-10-02 17:00     ` Liam R. Howlett
2026-10-19  8:53 ` Qiliang Yuan [this message]

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