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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e702f407asm172879455e9.13.2026.05.11.01.53.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 01:54:01 -0700 (PDT) Date: Mon, 11 May 2026 04:53:56 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: "David Hildenbrand (Arm)" , Jason Wang , Xuan Zhuo , Eugenio =?utf-8?B?UMOpcmV6?= , Muchun Song , Oscar Salvador , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Hugh Dickins , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , virtualization@lists.linux.dev, linux-mm@kvack.org, Andrea Arcangeli , "Liam R. Howlett" Subject: [PATCH v6 11/30] mm: use __GFP_ZERO in alloc_anon_folio Message-ID: <99c79224ca94e63dfcbe8523cedb2a8d658bdce1.1778488966.git.mst@redhat.com> References: MIME-Version: 1.0 In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 46kJ4FmFtfSbYJ887yuaRA35m1NmtTfiaDB25vE_PiM_1778489643 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: A318F1A0007 X-Stat-Signature: yn3ayrasc91imrd758jq1iiqs7sje6zn X-Rspam-User: X-HE-Tag: 1778489646-634236 X-HE-Meta: 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 ZHQAcDV8 eV2ODXytVP6GmQFrfDOgIHEHy/FPsWjQ3GQjRuF0ui9HDo8kY629YMvb6Mo7TUJxLHkMmNiOX2zss0IxUPHjQpoomlBiKZxB6I4zYs779lVADKRCX3chQpKLaCaoLxEq1WAgkr/3+Gx5jVAslrby9IcEuB/guGP/KmKcF8LW4FDi7PRJUNQp4kQ3D8zw2JgD46ct6qaD0dl7ea8j33zk1arxIBgZ//Unvkhi26t2x/GgRumym3CG1eQdSaQ5TNyC9U1dfYpU9RhIeu3ChvT+9+297o9+xe9DNiBI1GNGsiYo0ZOqjKZ/Un+uUtkwue01kqWm05LuvvHxh2KGg124LFCO4dOfBxh05VTd3kL2ZnjrhmZ6M3qklCxvBHXYl2qReDSSVyZ5jMHi2juKVfrt1GZccbA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Convert alloc_anon_folio() to pass __GFP_ZERO instead of zeroing at the callsite. post_alloc_hook uses the fault address passed through vma_alloc_folio for cache-friendly zeroing. Signed-off-by: Michael S. Tsirkin Assisted-by: Claude:claude-opus-4-6 --- mm/memory.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 74523bc00d8a..f3f1bc66366d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5249,7 +5249,7 @@ static struct folio *alloc_anon_folio(struct vm_fault *vmf) goto fallback; /* Try allocating the highest of the remaining orders. */ - gfp = vma_thp_gfp_mask(vma); + gfp = vma_thp_gfp_mask(vma) | __GFP_ZERO; while (orders) { folio = vma_alloc_folio(gfp, order, vma, vmf->address); if (folio) { @@ -5259,15 +5259,6 @@ static struct folio *alloc_anon_folio(struct vm_fault *vmf) goto next; } folio_throttle_swaprate(folio, gfp); - /* - * When a folio is not zeroed during allocation - * (__GFP_ZERO not used) or user folios require special - * handling, folio_zero_user() is used to make sure - * that the page corresponding to the faulting address - * will be hot in the cache after zeroing. - */ - if (user_alloc_needs_zeroing()) - folio_zero_user(folio, vmf->address); return folio; } next: -- MST