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Fri, 19 Dec 2025 17:38:52 +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 5DXnG6yNRWlTYAAAD6G6ig (envelope-from ); Fri, 19 Dec 2025 17:38:52 +0000 From: Vlastimil Babka Subject: [PATCH RFC v2 0/3] tweaks for __alloc_pages_slowpath() Date: Fri, 19 Dec 2025 18:38:50 +0100 Message-Id: <20251219-thp-thisnode-tweak-v2-0-0c01f231fd1c@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAKqNRWkC/32NTQ7CIBSEr9K8tRh41Zq6amLiAdyaLig8LTGBB hB/Gu4u4QAuZvHNZGZWCOQNBTg2K3hKJhhnC+CmATVLeydmdGFAjnuBomNxXopMsE4Tiy+SD6Z 6hVJNrezwAKW4eLqZdx29wuV8grGYpRKd/9SjJGr0bzMJxhmnXd9r0WqkaQjPQFv1hTHn/APIn +UNtwAAAA== X-Change-ID: 20251216-thp-thisnode-tweak-c9c2acb3a627 To: Andrew Morton , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , David Rientjes , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Mike Rapoport , Joshua Hahn , Pedro Falcato Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka X-Mailer: b4 0.14.3 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 6CAFE1C000F X-Stat-Signature: 7ropin7id8569nu7yab9dh9se5j3dq1i X-Rspam-User: X-HE-Tag: 1766165934-23398 X-HE-Meta: U2FsdGVkX19//cSCTn6vWz/s/bAaUroeg5Fhta2gMADhX8R0Yy26Xgpq+Tne9SwGOvlQOHfCNSjs0sVG7P7YNIhv9Scy/97hwnKpwLb1Vm9AxRIA1m+uVhS6CCwcK/INvNtQ8zSqMixdozeUDNq+vxh+wnu2i4X5zygVO1ycZNjdVVw68FfzYdUtDPCaj3FJv5KANHR2ZLsJByHfmECsxdmwNNuHFMN5yRJGpkk07P5+8usbC2CQoCvX3hTqBOWQ/53aN565Qr8jDSCEQ7jtAUSZfspKldj57U9wY9X13Z41PqOzby343ByVsr1WjaDcOOg3QhvMOqDida2ziYLfLEKoPPjx27Y0dw0EDWjrfv74HrOJcFrAOqPX/dxjptu8QVcjkyD+Y25/cENlpulVKXWeEP3kivi6exzsWgIkKlFgvIB0P9xX+qOHn/qsiif0PMfu1sD6GcyfE1pFGwZhUiiy28aVLqHp5zRSsSH1tutKUMzo+Abw2aeaTL9Uguk7ZqwJuHhTLWDvr8cg/nV0RNhwzPiySYMp2nEqyaKrGrClpAE8ahn7MtSFe3Y31xMjMQO94YvnK0Bgt2d567og82vXVWscWir35oZj2C1rY864QQRgwu6e38+k20T9bsJh43FIAeGKJ9mn82aoot54BAGPmU8VINYbn4y8dcqTN+erM5uDnzsZhAMejhXBCo2bx2KuDYs5wN/ikPsnXTSFkm0kBtXz7KgAc7inSVn26RdATC5q6Pv+LvK/F6U9Aoo6WqR+Oufn5dhD2ZbU6ued6DbqewWcB3O0nPRMU1vKrudrm1hTeLI7eDgWDwkgg3ThMLqJsav12OBliFjpnZ28/9HntUhfmiG1ovPdQTplg7M6mJyWDDEL6syeOGptyDX5ktFxk4JZvikmRmnTdSHU9x+mlQ8IY1tlTkOmtV0aO7APqZgvRFCvJ4fmSZ/kfsC3JHsquNdNYWN0h7Kk9Tq Pfozg49U 8V3PqiZPRU8L/R5SNgCFriaZs5kqpdHN3Z4E1D6xWmSD7RENdKpbwxC9GiDC/SuGAPgspwkNsCAHr0yuBSBRa4ogkNhoOdamXknMQfCBlvxxbjn8Y2zPSWec8265WWj+yTRJjLQTeuWBHHfB3hP9VBuHPEHIf9Ll1gI4+X8OmC+HZu4lFOJNWntfcnx/1wG8uenlvz7mH3Bef6FMwOWE5XQzaHobsHCcupVQT6UPpfx+WNrAicbAXtcYDdLnboAWLERl1U9TO9YwEMioD/v2BZABVgvjjn0kEviIDG8oxkVWomZrGLlgljBvL6mYdjZLS/Tf1e17F4nglQndrEb/r5+8qStB8WD8seCGofJSURxIvHOVhPf27STwDvW0KpAv9mwLwFsoN1s/gicSc14v4/wrJdI5rGjS3oGrY//K8SKMOvQRujxtfezBw3vZ6KyW3/bD7r/pZbVx0pOTY9pi+NaMDXCqP0W5Vbrud 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: RFC, feel free to ignore until next year... Sending just in case some feedback will materialize. Since v1 the main motivating fix (patch 1 of v1) was sent separately: https://lore.kernel.org/all/20251219-costly-noretry-thisnode-fix-v1-1-e1085a4a0c34@suse.cz/ In patch 2 of v1 I have proposed not to attempt reclaim for costly __GFP_NORETRY allocations at all. Johannes suggested that we should not change the semantics that much, so now instead we allow them all (except with __GFP_THISNODE). The main idea that remains is that we don't decide based on the exact compaction result anymore. Patch 3 is a cleanup also based on a suggestion from Johannes, and Patch 4 became the obvious next step in that direction. These should be making no functional changes. Signed-off-by: Vlastimil Babka --- Changes in v2: - actual THP reclaim fix sent separately - allow one reclaim attempt for __GFP_NORETRY allocations - further __alloc_pages_slowpath() cleanups - Link to v1: https://patch.msgid.link/20251216-thp-thisnode-tweak-v1-0-0e499d13d2eb@suse.cz --- Vlastimil Babka (3): mm/page_alloc: ignore the exact initial compaction result mm/page_alloc: refactor the initial compaction handling mm/page_alloc: simplify __alloc_pages_slowpath() flow mm/page_alloc.c | 169 ++++++++++++++++++++++++++------------------------------ 1 file changed, 77 insertions(+), 92 deletions(-) --- base-commit: 81a5997c0d5ac4cb3ce65f1128197cb751ccd15b change-id: 20251216-thp-thisnode-tweak-c9c2acb3a627 Best regards, -- Vlastimil Babka