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Thu, 29 May 2025 08:56:48 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 5U2gOFAhOGj5aQAAD6G6ig (envelope-from ); Thu, 29 May 2025 08:56:48 +0000 From: Vlastimil Babka Subject: [PATCH 0/2] frozen pages for large kmalloc Date: Thu, 29 May 2025 10:56:25 +0200 Message-Id: <20250529-frozen-pages-for-large-kmalloc-v1-0-b3aa52a8fa17@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIADkhOGgC/x2NQQqDMBAAvyJ7diFdzKF+RXqIZpMuxkQ2IKL49 4YeB4aZGyqrcIWxu0H5kColN3j1HSxflyOj+MZAhqyx9Mag5eKMu4tcMRTF5LRZ6+ZSKgvOfvB kidjSDC2yKwc5/4Pp8zw/Bn3zqnAAAAA= X-Change-ID: 20250529-frozen-pages-for-large-kmalloc-bd4d2522e52b To: Christoph Lameter , David Rientjes Cc: Andrew Morton , Roman Gushchin , Harry Yoo , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; 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We exposed to -next and indeed got such a warning [2]. But it turns out the code is using sendpage_ok() and thus would avoid the get_page() if the page was actually frozen. So in this version, freeze the large kmalloc pages at the same time as adding the warnings and refusals to get_page/put_page() on large kmalloc pages, the same as we do for slab pages - in patch 1. While doing that I've noticed that large kmalloc doesn't observe numa policies, while the rest of the allocator does. So I've done that in patch 2 as I assume Christopher would welcome this change. Given the timing I would expose this to -next after the current merge window closes, thus towards 6.17. [1] https://lore.kernel.org/all/20250417074102.4543-2-vbabka@suse.cz/ [2] https://lore.kernel.org/all/202505221248.595a9117-lkp@intel.com/ Signed-off-by: Vlastimil Babka --- Vlastimil Babka (2): mm, slab: use frozen pages for large kmalloc mm, slab: support NUMA policy for large kmalloc include/linux/mm.h | 4 +++- mm/slub.c | 9 +++++++-- 2 files changed, 10 insertions(+), 3 deletions(-) --- base-commit: 9c32cda43eb78f78c73aee4aa344b777714e259b change-id: 20250529-frozen-pages-for-large-kmalloc-bd4d2522e52b Best regards, -- Vlastimil Babka