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[67.231.153.30]) by mx.google.com with ESMTPS id x18si16014245ybs.101.2019.07.29.22.23.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 29 Jul 2019 22:23:35 -0700 (PDT) Received-SPF: pass (google.com: domain of prvs=31148e3214=songliubraving@fb.com designates 67.231.153.30 as permitted sender) client-ip=67.231.153.30; Authentication-Results: mx.google.com; dkim=pass header.i=@fb.com header.s=facebook header.b=UbU4pV0W; spf=pass (google.com: domain of prvs=31148e3214=songliubraving@fb.com designates 67.231.153.30 as permitted sender) smtp.mailfrom="prvs=31148e3214=songliubraving@fb.com"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=fb.com Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.16.0.27/8.16.0.27) with SMTP id x6U5NWPO009788 for ; Mon, 29 Jul 2019 22:23:35 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=+zWjU0C6LD6HpRrP4wreVSMF6ug2Y3cK0xwApLG5ZA4=; b=UbU4pV0W3DxRWEaix/W2co//eu5KlKLS2m1VkOsi0GL2xPlA2eBds9vqvxXaOnJl6ZK/ 5gjj6EaJwgtu1vn19XtMDjo4BlPzJde+muZDfGqKIXn9cqNJV8DNnPJGeCmtFsAyidHR YG4lkGx0ik2CAyHfxZYrzX4QAUtqekPyhR4= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by m0089730.ppops.net with ESMTP id 2u234ku0np-7 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Mon, 29 Jul 2019 22:23:35 -0700 Received: from mx-out.facebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::130) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Mon, 29 Jul 2019 22:23:27 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 4162862E2FF4; Mon, 29 Jul 2019 22:23:26 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Song Liu Smtp-Origin-Hostname: devbig006.ftw2.facebook.com To: , , CC: , , , , , , Song Liu Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH v10 4/4] uprobe: use FOLL_SPLIT_PMD instead of FOLL_SPLIT Date: Mon, 29 Jul 2019 22:23:05 -0700 Message-ID: <20190730052305.3672336-5-songliubraving@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190730052305.3672336-1-songliubraving@fb.com> References: <20190730052305.3672336-1-songliubraving@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-30_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=771 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1907300056 X-FB-Internal: deliver X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This patch uses newly added FOLL_SPLIT_PMD in uprobe. This preserves the huge page when the uprobe is enabled. When the uprobe is disabled, newer instances of the same application could still benefit from huge page. For the next step, we will enable khugepaged to regroup the pmd, so that existing instances of the application could also benefit from huge page after the uprobe is disabled. Acked-by: Kirill A. Shutemov Reviewed-by: Srikar Dronamraju Signed-off-by: Song Liu --- kernel/events/uprobes.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 648f47553bff..27b596f14463 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -155,7 +155,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, { struct mm_struct *mm = vma->vm_mm; struct page_vma_mapped_walk pvmw = { - .page = old_page, + .page = compound_head(old_page), .vma = vma, .address = addr, }; @@ -166,8 +166,6 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr, addr + PAGE_SIZE); - VM_BUG_ON_PAGE(PageTransHuge(old_page), old_page); - if (new_page) { err = mem_cgroup_try_charge(new_page, vma->vm_mm, GFP_KERNEL, &memcg, false); @@ -481,7 +479,7 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, retry: /* Read the page with vaddr into memory */ ret = get_user_pages_remote(NULL, mm, vaddr, 1, - FOLL_FORCE | FOLL_SPLIT, &old_page, &vma, NULL); + FOLL_FORCE | FOLL_SPLIT_PMD, &old_page, &vma, NULL); if (ret <= 0) return ret; -- 2.17.1