From nobody Wed Feb 11 06:31:24 2026 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) (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 88D6C482CA for ; Mon, 22 Apr 2024 07:03:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713769383; cv=none; b=CYftjywwC/1PmhtAnYDJX0BvMWxyOL48jbk1MKh+sp+k8zlA8Koj0UzUNGBRQvz8g9G/EyEMAfPnFPla9Fpxvl/45YJzIpxdB7W6FX0g1JWso2ZjlG39Ez7ibO73hKkitBDlnYNlRKDhxqTOXNbszvkrZ2n7qYxXk4q9zIiO8Zg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713769383; c=relaxed/simple; bh=TBzYTl2S89wFgHKU5IZMBLPsDVAVa/SBQeUl+du9Wzk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=PAtPjmD8Vv/ilVhhYQlfeX//vJO2Bt8x4XTbZMzMdVrcs9DkXx812aF6RC/3sIlNMvfnDqKKV/OqUrJ87gl3UM7IDjrHI9TDCTONRRCaNaSmTAp3u8QyC8bNnrGi70zaS5iFwhSG5K4FWTvh0x74uz5vVD4iIIvjh6bRb2t3ooI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=d9H7dXA3; arc=none smtp.client-ip=115.124.30.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="d9H7dXA3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1713769378; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=iA51Bkqzy9zcXZ9S3Nkg6q/BBso18kv2IFiMWpEhGCs=; b=d9H7dXA3OkN5DMCvZyHjmmKv7zMP+IdJ9zqkOuoZ0p+W8tBIIEhqlgSceJJq1t1yms1JHJ2VSlMYTqaz2Au6/rREcdgMlWllo4gONZI28TaeFugKCrksHHLgAiAl2M0XWaegw8q2PG7XtPQTDGlwjijQnre9x+n77yV/drgkE6s= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=13;SR=0;TI=SMTPD_---0W5.T-Y-_1713769375; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0W5.T-Y-_1713769375) by smtp.aliyun-inc.com; Mon, 22 Apr 2024 15:02:57 +0800 From: Baolin Wang To: akpm@linux-foundation.org, hughd@google.com Cc: willy@infradead.org, david@redhat.com, wangkefeng.wang@huawei.com, 21cnbao@gmail.com, ryan.roberts@arm.com, ying.huang@intel.com, shy828301@gmail.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/5] mm: memory: extend finish_fault() to support large folio Date: Mon, 22 Apr 2024 15:02:39 +0800 Message-Id: <358aefb1858b63164894d7d8504f3dae0b495366.1713755580.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add large folio mapping establishment support for finish_fault() as a prepa= ration, to support multi-size THP allocation of anonymous shared pages in the follo= wing patches. Signed-off-by: Baolin Wang --- mm/memory.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index b6fa5146b260..094a76730776 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4766,7 +4766,10 @@ vm_fault_t finish_fault(struct vm_fault *vmf) { struct vm_area_struct *vma =3D vmf->vma; struct page *page; + struct folio *folio; vm_fault_t ret; + int nr_pages, i; + unsigned long addr; =20 /* Did we COW the page? */ if ((vmf->flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) @@ -4797,22 +4800,30 @@ vm_fault_t finish_fault(struct vm_fault *vmf) return VM_FAULT_OOM; } =20 + folio =3D page_folio(page); + nr_pages =3D folio_nr_pages(folio); + addr =3D ALIGN_DOWN(vmf->address, nr_pages * PAGE_SIZE); vmf->pte =3D pte_offset_map_lock(vma->vm_mm, vmf->pmd, - vmf->address, &vmf->ptl); + addr, &vmf->ptl); if (!vmf->pte) return VM_FAULT_NOPAGE; =20 /* Re-check under ptl */ - if (likely(!vmf_pte_changed(vmf))) { - struct folio *folio =3D page_folio(page); - - set_pte_range(vmf, folio, page, 1, vmf->address); - ret =3D 0; - } else { + if (nr_pages =3D=3D 1 && vmf_pte_changed(vmf)) { update_mmu_tlb(vma, vmf->address, vmf->pte); ret =3D VM_FAULT_NOPAGE; + goto unlock; + } else if (nr_pages > 1 && !pte_range_none(vmf->pte, nr_pages)) { + for (i =3D 0; i < nr_pages; i++) + update_mmu_tlb(vma, addr + PAGE_SIZE * i, vmf->pte + i); + ret =3D VM_FAULT_NOPAGE; + goto unlock; } =20 + set_pte_range(vmf, folio, &folio->page, nr_pages, addr); + ret =3D 0; + +unlock: pte_unmap_unlock(vmf->pte, vmf->ptl); return ret; } --=20 2.39.3