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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45491ca2fd6sm25007169f8f.30.2026.05.11.02.02.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 02:02:51 -0700 (PDT) Date: Mon, 11 May 2026 05:02:45 -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 resend v6 11/30] mm: use __GFP_ZERO in alloc_anon_folio Message-ID: <99c79224ca94e63dfcbe8523cedb2a8d658bdce1.1778489843.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: B0waWvp-lCFlZMAmFatOc7ndvnOt9jMrC6jxJablMQ8_1778490173 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 21FF7A0004 X-Rspam-User: X-Stat-Signature: jin6pmpgeik3hcr9tyheh9ibdnae6bcz X-HE-Tag: 1778490178-425820 X-HE-Meta: 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 Euc/CR9u 1aAr+ZIECQMIV3U+76KuQFUIC3bnXit9NuGRp9dgPClcHPH6H5x0AxxGiF+gto+auaSay1k1pkQAwS+N9qoqj7SnrDsRgZ++rGX0+qy+UOonQ73pDFm6RTHDI6FwKWms+prB6GwKT/8Z+4/EGwWb/fe2/f/iDiC02AddFx9+hLU2vWxizRB1knf/IgdDExz0+6ynWNr/25buhjA8+WVqWUQqyAZd9slz6LV60kQFm2EggwTG8h7fOtkT4P0VoOzz8r+s30m158fMNrBxwo5XNITV6UHX1ZM5jpnS+/l0teQH82rA9j3KymSDEAjUTU9Dot+pItGgRFthi5UiNw0gUQA1ocrurbBlWLDZaL81CtVSlnl60Es14rPphcn6GTDLym/bcjI+QWAq9UpXkzpZ6N2NI+g== 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