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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1759510435; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=xRVhaW2/i9fEx7I+LuZkY7sYjvYyEufnTn/0UGKwdi0=; b=JFUg0FPrMvBpqOsOnXFw1DQ5mKTUoNhv4ZasSvNFslafvWH0wPdUdFy4mTg40rMlU6RUKI TqBCkuIDs60abnrrtDQxPvU0IALLTfKW0PvrsfomgVv2OVlM2tuRdY9jU2/T4e8kd56sPw 3WFwXu/A+bbqzgtSp/nWKS3EOza4gvM= From: Qi Zheng To: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, david@redhat.com, lorenzo.stoakes@oracle.com, ziy@nvidia.com, harry.yoo@oracle.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Qi Zheng Subject: [PATCH v4 0/4] reparent the THP split queue Date: Sat, 4 Oct 2025 00:53:14 +0800 Message-ID: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 61AC6100006 X-Stat-Signature: m4wkxnoqxrs8if1kf3hnkbh461ny3ktw X-Rspam-User: X-HE-Tag: 1759510437-722270 X-HE-Meta: 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 WoB3ZkE0 uUUhvK+lVohNUdxvM9PK8ZeRPQjNZNoGMARNq7sQHQOuj+q6CV7yDNoEmQjngoG3Zuwi/UOalrLNMVSXpROTjn7Qg33Wg59kG+r9/juYw5aoIU3Yu9oEffJ2EgZHwJEOYQcBc9vbv3FiRyPNJdcgscnDpl8oROBfjOIaYxL2sIfGW69FPQPTVgBaerillF0jPSRJ6i2wwQdUjVcs= 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: From: Qi Zheng Changes in v4: - add split_queue_lock*() and let folio_split_queue_lock*() to use them. (I have kept everyone's Acked-bys and Reviewed-bys. If you need to discard it, please let me know.) - let deferred_split_scan() to use split_queue_lock_irqsave(), which will fix the race problem in [PATCH v3 4/4]. (Muchun Song) - collect Reviewed-bys - rebase onto the next-20251002 Changes in v3: - use css_is_dying() in folio_split_queue_lock*() to check if memcg is dying (David Hildenbrand, Shakeel Butt and Zi Yan) - modify the commit message in [PATCH v2 4/4] (Roman Gushchin) - fix the build error in [PATCH v2 4/4] - collect Acked-bys and Reviewed-bys - rebase onto the next-20250926 Changes in v2: - fix build errors in [PATCH 2/4] and [PATCH 4/4] - some cleanups for [PATCH 3/4] (suggested by David Hildenbrand) - collect Acked-bys and Reviewed-bys - rebase onto the next-20250922 Hi all, In the future, we will reparent LRU folios during memcg offline to eliminate dying memory cgroups, which requires reparenting the THP split queue to its parent memcg. Similar to list_lru, the split queue is relatively independent and does not need to be reparented along with objcg and LRU folios (holding objcg lock and lru lock). Therefore, we can apply the same mechanism as list_lru to reparent the split queue first when memcg is offine. The first three patches in this series are separated from the series "Eliminate Dying Memory Cgroup" [1], mainly to do some cleanup and preparatory work. The last patch reparents the THP split queue to its parent memcg during memcg offline. Comments and suggestions are welcome! Thanks, Qi [1]. https://lore.kernel.org/all/20250415024532.26632-1-songmuchun@bytedance.com/ Muchun Song (3): mm: thp: replace folio_memcg() with folio_memcg_charged() mm: thp: introduce folio_split_queue_lock and its variants mm: thp: use folio_batch to handle THP splitting in deferred_split_scan() Qi Zheng (1): mm: thp: reparent the split queue during memcg offline include/linux/huge_mm.h | 4 + include/linux/memcontrol.h | 10 ++ mm/huge_memory.c | 258 +++++++++++++++++++++++++------------ mm/memcontrol.c | 1 + 4 files changed, 192 insertions(+), 81 deletions(-) -- 2.20.1