From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3375E3BA225 for ; Mon, 11 May 2026 08:54:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778489658; cv=none; b=TIFnP/gcIBZmH1APHvjcLawVZ4hp0/XlH+PKOO9HFBaEc4658zuK779bON1wbaJUr89hd41Mgy2wO/+WJwkFKLfUAZBKRubjqjic9pKXsEVi23ZYI/hKmkHza7pzWziUBZy/ZjM7LALhlf03/jnRvZ3CcbLmWkl75U14fNUcYi8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778489658; c=relaxed/simple; bh=tkchtNB3GzzFWMQ1E0X1DKUjhQK/O579SYT7H3vP5sk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Dd5edIaVM9W8u97c0OnZ8FQz1iYoRAMuJWh9yQ4AGGNByab/PN4jz1QRANMTLZrLiLntT7CEWHshcQWpKJ+L5QLcmBGkLdwHWoedUN5CJCFc3LA5hPn5iF05Av7pGl0x2my6/IeIEyoo3xUTF1wwFHdknJlnZ2g6FMvb3bwPYHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=UNIq+VLs; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=p8iYxsJf; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="UNIq+VLs"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="p8iYxsJf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1778489656; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=43zcPeyEBahcbXzXBePbjbHiq0vh8NFM/GDJyyFYelY=; b=UNIq+VLsDaCnINzaFIaKm9PhDY0K4TuEVh2w7LyTffmMO8egRA0F25KGyAVKFHg6xrb/Kg 1NTi5ukHP4YCcwNOv5+4HEpS6rtVM/0NtRJ7lz5vTFXGCyBDdQFhpwAMfM77fO9ImrUXsG BkClLQXZgRNtjxfYVf+y9TPveotvt54= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-644-aYts7iZwMt-fvknJqHalwg-1; Mon, 11 May 2026 04:54:15 -0400 X-MC-Unique: aYts7iZwMt-fvknJqHalwg-1 X-Mimecast-MFC-AGG-ID: aYts7iZwMt-fvknJqHalwg_1778489654 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-48d1bc85bb3so20600725e9.0 for ; Mon, 11 May 2026 01:54:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1778489653; x=1779094453; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=43zcPeyEBahcbXzXBePbjbHiq0vh8NFM/GDJyyFYelY=; b=p8iYxsJftvyLiCdYbrSFAXhUdbfX7JvBQplm2vMzFuq3n95WvpkRIuHycSKw/+jucs /KXNS3wQOl3vDiHpshfjlUI2LV6DlEeO7+n3kGDxjzVrTzbOhv2qkOiRON+Nof9NRX73 ojkApwCKaT4/xoNwjhwA0ELRqeP/+Tq2C2c3sMttJl+IddcP6hGPHvZGb+yKe9/zhMYQ kkw/Ea3QRXgFf3fXXJSlvHn10rPvO4SfOyR4Omwq/eOjr0omo4ReR1xV+Q+iCGjYmaRp +q5qjJR1sQXghTuBb3wh6gLgcRpYaYgUkQfy1Sod4AqZmIsR0tcGO017WLvWlmsTU9Q6 zohQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778489653; x=1779094453; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=43zcPeyEBahcbXzXBePbjbHiq0vh8NFM/GDJyyFYelY=; b=bFcw3DspRIP990MVNqV+auG6Fc8AA2aCGFsqNXeQIrlg9pYMSrw/av1ADvOMbbASZC Tvr3KFqn5dbeIqS+5ATQ09QuK4XInlpeE/B7Vxcsl7q5yAJ1SOfZblgOC6CyODBNIcKl ANtC7w33lw/KFt0E855X7PuNAMT956mv/pLp/xw+1oSbJVPUeLXoMmeW+3iNZls00lQv 0j+mdzRhxM2xqRQjzUt0YiprQqZE98SdSP2rMDy3iuTHomS977YnJKPLAXXJdjoRsbiC lcda9fmHjiLlWRS0ZCwYrlW4PfEQCM74wi42U7rCisBeIrO/pl5+XOw5jE+QC9tB7U3C qjIA== X-Gm-Message-State: AOJu0Yxlmg9vK24ZkBqcQVlsZvXToxWKHH7SkVQ+SZdnnGbp0lTC9v2M 9YxXkZQw786E2SCRVitmp0FmXczljZB30s5vn1qQJdICnUl7eYRbOGtqZbeMj6xt37qQTubknsE tqpWlzimEpVrFVv/H24vH+DbMbJcJn5dPOtFgJ20IiBGQjCySambsO7WELHC/4Mbqo7wlsIGzwT OtoR/9mn3ldUzIaQK45S3oMrT1pxRV2LAtvILXYEoTyMDbMQ== X-Gm-Gg: Acq92OEunMHl7+ZCWYZ3z0umQN4dJQMhxOTAQTEUdAZRdjmOKWu+9n71YHWWwf8gfdl Xxb5aAgNgbzqJNeeki7E5iPrLAIlAtKf4qTc7Ue0Km2OcBURU5ikjoUB+pE47vfTMpmgZqd85SI qXdNRkZLYQpKdVKUJxMZZVKRJGnh1LkKYhnCP2nF24pi1hCW5ADgFIKZjd39bmLmQ5Av7j6Kl9s jP3R4TWoAj5mYN/aFDt5qKg/H7+9k2MUiL4xLk3+SurK/pfYBO+/D6qSyFoVbkYj1iB2+DD8c5o Qq0M10pnL8NX7iNfD5NF8Iq4R/pWswT3LGqsMpbV7GcJQFO/7ZjOl9ltw5J8sPyz5dWIhAp74Q8 k5CQDrF25HC8f/h8yqYDyB+W0q8ewvIT+Gm1n51mU X-Received: by 2002:a05:600c:8710:b0:48a:761:5816 with SMTP id 5b1f17b1804b1-48e6d79b006mr166664295e9.8.1778489653444; Mon, 11 May 2026 01:54:13 -0700 (PDT) X-Received: by 2002:a05:600c:8710:b0:48a:761:5816 with SMTP id 5b1f17b1804b1-48e6d79b006mr166663275e9.8.1778489652743; Mon, 11 May 2026 01:54:12 -0700 (PDT) Received: from redhat.com (IGLD-80-230-48-7.inter.net.il. [80.230.48.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e702e5614sm174868625e9.9.2026.05.11.01.54.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 01:54:12 -0700 (PDT) Date: Mon, 11 May 2026 04:54:07 -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 12/30] mm: use __GFP_ZERO in vma_alloc_anon_folio_pmd Message-ID: <709da61903c6e395ea51caa48eb5e5733d2f3d49.1778487000.git.mst@redhat.com> References: 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=us-ascii Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Convert vma_alloc_anon_folio_pmd() 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/huge_memory.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d689e6491ddb..9845c920c29c 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1333,7 +1333,7 @@ EXPORT_SYMBOL_GPL(thp_get_unmapped_area); static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma, unsigned long addr) { - gfp_t gfp = vma_thp_gfp_mask(vma); + gfp_t gfp = vma_thp_gfp_mask(vma) | __GFP_ZERO; const int order = HPAGE_PMD_ORDER; struct folio *folio; @@ -1356,14 +1356,6 @@ static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma, } 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, addr); /* * The memory barrier inside __folio_mark_uptodate makes sure that * folio_zero_user writes become visible before the set_pmd_at() -- MST