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b=n7/r67hdM7EezCfE26KRK2p12eJIjZ/zBDqUya+yxx8kActvRK0dT6D7YnTi8zp3D 4d41BK6Qpq5Gyo33Nn/djyf1JLp+a4OUfKCnwamvZClFSEfqe1xw8KMKtrRMx++6ft Ow8m1WQnc+JA/ePg6/Nm1V4PxbQBpYvMangBE/7J9Hnb6c/agMyESFVPsK8T12pg1g TZlP00Ox1zyDN6UaJ3gJqRVw8PmIs0bP5cMSVTIDqUa0I0rui9YuhokAOUrA33H+6e JLZaOPwp/rabQ0jLFDyNc3W18u0ttP62T2oxjTaGDzxy4RngOy71oJMnLZVDR/DRsh znLuRviPpcegg== Message-ID: Date: Thu, 27 Aug 2026 17:25:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] mm/huge_memory: dequeue the deferred split after the split freeze To: Kiryl Shutsemau , akpm@linux-foundation.org, ljs@kernel.org, hannes@cmpxchg.org, usama.arif@linux.dev Cc: lance.yang@linux.dev, ziy@nvidia.com, hughd@google.com, baolin.wang@linux.alibaba.com, baohua@kernel.org, liam@infradead.org, nico.pache@linux.dev, dev.jain@arm.com, ryan.roberts@arm.com, balbirs@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kiryl Shutsemau (Meta)" References: <20260826162101.1314941-1-kirill@shutemov.name> <20260826162101.1314941-3-kirill@shutemov.name> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: A3278180004 X-Stat-Signature: 1btdtjdwgxuj4uu1jmo5zfc3r1d9n7pq X-HE-Tag: 1787844327-864811 X-HE-Meta: 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 /wCGKcXb PZbGlgNmfMj+ToC6ImYclZzObDiS78g+5PNRkgrIZOmXeFvOx0y0No7ReMaQdwK14+HxNOUqSLsgIcbKocEHa/Mihqmh/uh6pkKVcR+dC/pTDWlQ4UBvM4Utlw957QFpYQc+tpI+e7FOykFPQLK0QWkE230knLwZF22/CuvMgVL/oWXCW0oJqQ4VCgdXRsV2SRi6/4VKi9NoALEaDGQU9rjB9mVQZ59YDtbY3shOF/tJwUL33E2YNAj4aRPDKSM+SiTfycTidJA5aawLqv3Uu29199revRFz34wJG7jN0r4KIu5ihJVsgNboeLRq5Qjzz1HKD3seglE++HPOH2lqGnl+pQs685SSY/ceA Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/26/26 18:20, Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > __folio_freeze_and_split_unmapped() takes the deferred split list_lru lock > across the freeze. It is only there to stop deferred_split_scan() from > touching the folio under split. > > With deferred_split_isolate() fixed, the workaround can be dropped. > > Unqueue the folio after folio_ref_freeze(), the way > __folio_migrate_mapping() does: folio_unqueue_deferred_split() needs a > zero refcount and a memcg still set, and both hold there. > > If the split is called from deferred_split_scan(), the unqueue is a > no-op -- the folio is already removed from the list. But > PG_partially_mapped is still set, so it has to be cleared here or > MTHP_STAT_NR_ANON_PARTIALLY_MAPPED never comes back down. > > Assisted-by: Claude-Code:claude-opus-5 > Signed-off-by: Kiryl Shutsemau (Meta) > --- LGTM! Acked-by: David Hildenbrand (Arm) -- Cheers, David