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Tue, 16 Dec 2025 15:54:49 +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 u5knOsmAQWkSGgAAD6G6ig (envelope-from ); Tue, 16 Dec 2025 15:54:49 +0000 From: Vlastimil Babka Subject: [PATCH RFC 0/2] tweaks for costly order __GFP_NORETRY reclaim Date: Tue, 16 Dec 2025 16:54:20 +0100 Message-Id: <20251216-thp-thisnode-tweak-v1-0-0e499d13d2eb@suse.cz> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAKyAQWkC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1NDI0Mz3ZKMAiDOLM7LT0nVLSlPTczWTbZMNkpMTjJONDMyVwJqLChKTcu sABsarRTk5qwUW1sLAHFRPctpAAAA 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-Developer-Signature: v=1; a=openpgp-sha256; l=1092; i=vbabka@suse.cz; h=from:subject:message-id; bh=kL9+KpDIWvIBUolkDk+Pi8uorseX2uedd2CBZveMJx0=; b=owEBiQF2/pANAwAIAbvgsHXSRYiaAcsmYgBpQYC/76PJHdArRDmHbWkIgUHaSpp3qlMNzWsBl yHDGFWp1kCJAU8EAAEIADkWIQR7u8hBFZkjSJZITfG74LB10kWImgUCaUGAvxsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMSwyLDIACgkQu+CwddJFiJqzywgAh7vmhJIt1xMY2RDH7CmN/dJgmDTqR8M ufZTT1a3K9bhJprNJVF7v1nET+4OI7gxBN9iLz1AlEXA0aahbkTe1/8HqB9uiVwhGLJQJ5xLtyJ 9vrkaUqd3C85fMeVVKZCVf8/QvU68b0p9if+Cz/AaOM6kCvqOQzMh7v8DkLaAdR+atRaZVp2+1Y NfrwrculbI1ILmqA6LwNarXiEorxRrn3F0uiy8AAGKH+WJ6RnHXCPAAaa4O3Lkto41mF141V2qS cFQKg1MJvLL8Ii75Yzf9Ti8c7bCg4Zn804K9r3gXZW6f5w9sxvM4FPxZpdFeZ38lOAwbUT4s3aZ pOsMN+axjKA== X-Developer-Key: i=vbabka@suse.cz; a=openpgp; fpr=A940D434992C2E8E99103D50224FA7E7CC82A664 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.995]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FREEMAIL_TO(0.00)[linux-foundation.org,google.com,suse.com,cmpxchg.org,nvidia.com,kernel.org,oracle.com,gmail.com,suse.de]; FUZZY_RATELIMITED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[16]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TAGGED_RCPT(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.cz:mid,suse.cz:email] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -2.80 This is motivated by an excessive reclaim issue we saw in a customer workload and was associated with THP page faults and an unexpected zone_reclaim_mode-like behavior that can happen for those. The first patch is intended as a minimal targeted backportable fix for the observed issue. I hope I'll be able to confirm it has fixed the problem, but it might take some time. The second patch is a more "let's take a step back and rethink what we're doing here" so it's separate, as it changes a bit the semantics of __GFP_NORETRY. Signed-off-by: Vlastimil Babka --- Vlastimil Babka (2): mm, page_alloc, thp: prevent reclaim for __GFP_THISNODE THP allocations mm, page_alloc: fail costly __GFP_NORETRY allocations faster include/linux/gfp_types.h | 2 ++ mm/page_alloc.c | 33 +++------------------------------ 2 files changed, 5 insertions(+), 30 deletions(-) --- base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 change-id: 20251216-thp-thisnode-tweak-c9c2acb3a627 Best regards, -- Vlastimil Babka