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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-66d24721e47sm2631290d50.13.2026.08.27.02.16.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Aug 2026 02:16:38 -0700 (PDT) Date: Thu, 27 Aug 2026 02:16:25 -0700 (PDT) From: Hugh Dickins To: "David Hildenbrand (Arm)" cc: Hugh Dickins , Andrew Morton , Ackerley Tng , Alexander Viro , Baolin Wang , Barry Song , Binbin Wu , Christian Brauner , Christoph Hellwig , Christoph Lameter , Claudio Imbrenda , JP Kobryn , Jan Kara , Jens Axboe , Johannes Weiner , Kairui Song , Kiryl Shutsemau , Lance Yang , Leonardo Bras , Lorenzo Stoakes , Marcelo Tosatti , Matthew Wilcox , Mel Gorman , Miaohe Lin , Michal Hocko , Minchan Kim , Muchun Song , Oscar Salvador , Peter Zijlstra , Qi Zheng , Rik van Riel , Sebastian Andrzej Siewior , Shakeel Butt , Suren Baghdasaryan , Vlastimil Babka , Yang Shi , Yu Zhao , Zach O'Keefe , Zi Yan , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH alt 13/25] mm/fbatch: no lru_add_drain() to collect_longterm_unpinnable_folios() In-Reply-To: <5d42fbfa-1cc3-4161-8ba0-7318267576a1@kernel.org> Message-ID: References: <14a16945-529b-8bc0-ab38-3ea97e54e223@google.com> <333bb765-a36d-e07e-d3c4-5ea2f1cadfcb@google.com> <5d42fbfa-1cc3-4161-8ba0-7318267576a1@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C6A3C16000E X-Stat-Signature: pfet4hox7xwkeuhpgouqa6r67qzf4rye X-HE-Tag: 1787822200-677096 X-HE-Meta: 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 n/fxS9i9 ElHw5da0cu54oxC89y75Gpz5jJAHV9oyfefveNb6B+3tjgI2Z/WBCNNpLfF/9Aavhh8eKI5LL8KZbHOMNtSuBMG+4s6lJ4NvwZZRxVhtY/dCi/2L20bHw8ReW5PjVnLpRKSSne/N5ZIiWGDZbM9sHf3n/A1c2e92E8t2RvyNBHcRxhHgF/Vgfl+akDMKShxeTXIZ563JnkUuqDajImdCN79+96K4x7fW1FnFqd3wR3Lo89guOR+Wqd0NisWIpgZtYBav6+pOKirZelxlbWh+VW9GcpgxovrN/Mj0jcRF8ijVVx4hhVet6WsfBy6OjwqgAqFckNhNiFiBqjUwhnHQvuY8e9obV5ORD2pJVOxEu7dn9P/fuwdrWk+ropDCd03p/iGXxZ5yPFWSIvZnUWxOk7HqGXC7xM3XIJcO4smlhsPATh2Op+FibOMlf8jDiGO+wNeunekFs15pIK0U8Rn5GY/VXEQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 24 Aug 2026, David Hildenbrand (Arm) wrote: > On 8/24/26 16:55, Hugh Dickins wrote: > > collect_longterm_unpinnable_folios() has no use for lru_add_drain() nor > > lru_add_drain_all(), now that the per-cpu fbatch references are gone. > > So remove the recently added lru_cache_drain_for_folio(). > > > > Signed-off-by: Hugh Dickins > > --- > > Alternate version for use once David Hildenbrand's two commits > > here have been pulled from mm.git into linux.git for 7.3-rc1. > > For 7.4 we expect another user of the helper in KVM guest_memfd code (the > primary reason why we introduce the helper), so depending on when this series is > ready it will just remove that user as well, or we'll need some coordination > between trees. Yes, I could supply an alternate alternate version, providing an empty stub for lru_cache_drain_for_folio(), so Ackerley's and my series can proceed (or not) independently. Later. But at present your patch or patches seem to be in both mm.git and Ackerley's series (17/46), but not yet in Linus's tree. Hugh