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b=AewH8qVoW428CLvXuvn03nnnNNP+TgdWg5uRUNFsxqCL+qVKeAjZDW+Tmxv3tAVdc 7UIVsQWQbyBgUKhK2nFQti2iPxw0BTpPo1vq8iLuV88Lgd4H/PB1EF6MYmiaihBni6 G5F6gOD/c/IuPNuv7PXCBiTHbx44v1IRNf32u/Vb0ErvNQVonwYUp8zYU+tDAzZUdx wy/6HEE8/4+JjE3saEFPne1x2ZAx9PbQZVIk5BRuTTtwzFXfGeJJJXlXU5XunauPqm Sxc89Jf7AuhJN9ZCDiVpmwkcHiZr7L6Sjj+HRwJWxkrQ4nRUqxV3uAdsRHdH+ppbBk YaSl01yghZ8oQ== Message-ID: <1dc8f7d5-c923-410a-a262-dc21c9e65420@kernel.org> Date: Thu, 27 Aug 2026 11:20:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH alt 13/25] mm/fbatch: no lru_add_drain() to collect_longterm_unpinnable_folios() To: Hugh Dickins Cc: 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 References: <14a16945-529b-8bc0-ab38-3ea97e54e223@google.com> <333bb765-a36d-e07e-d3c4-5ea2f1cadfcb@google.com> <5d42fbfa-1cc3-4161-8ba0-7318267576a1@kernel.org> 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-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 28A4940004 X-Stat-Signature: ge41eyafsz7maksj9i3jhs9tjmrb8boy X-Rspam-User: X-HE-Tag: 1787822442-440985 X-HE-Meta: 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 Xe4pscCC 3xtdGCFtbH1Eda/ZVHW2jA5ZUM3u00ibzWcIhTJwDUkoi4YDH1EjZaJGgSlrz2NPzTZT4rytbtJZGR2TsuL9AS/nyPOUSEgTFrAXB5TZBYdqo9R+akxpCY/IL+eL9Qh4uKnFdICkwnxSz8crBAGWaqCmL9TGNC8917mTVimf/64XJYU2c6yYvzj4unAeYodc/lS6dd21pcDbxK1qoZ/gj9GTdKW4UnPhSexcOlL44PXAnfaKyPsUuv5xrOSBvL+llQ7KsDVL243pnB7tClg0X8Mr2Z4z7L9eoMWMdwz43+gqZ0USbe13sDrTX45p+fpzldq6TNmTPP22WUVaRcA3YmzjRSVcRrk9mVfQSs4j2ylj++XuS6sZ5igNpEDIsn31CekJ6wqyDcAfHmAdbFRtYLfjpbA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/27/26 11:16, Hugh Dickins wrote: > 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. They are in mm-stable, so they should go upstream this week. Anyhow, that's all stuff that's easily resolved later. -- Cheers, David