From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26225C433FF for ; Wed, 7 Aug 2019 23:37:47 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D10BA20880 for ; Wed, 7 Aug 2019 23:37:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="fBsqb63h" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D10BA20880 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=fb.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2F1E16B000C; Wed, 7 Aug 2019 19:37:45 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 253D06B000D; Wed, 7 Aug 2019 19:37:45 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F6CC6B000E; Wed, 7 Aug 2019 19:37:45 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f199.google.com (mail-pf1-f199.google.com [209.85.210.199]) by kanga.kvack.org (Postfix) with ESMTP id CD6A36B000C for ; Wed, 7 Aug 2019 19:37:44 -0400 (EDT) Received: by mail-pf1-f199.google.com with SMTP id e20so57808631pfd.3 for ; Wed, 07 Aug 2019 16:37:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:dkim-signature:smtp-origin-hostprefix:from :smtp-origin-hostname:to:cc:smtp-origin-cluster:subject:date :message-id:in-reply-to:references:mime-version; bh=+zWjU0C6LD6HpRrP4wreVSMF6ug2Y3cK0xwApLG5ZA4=; b=OklF3yXLacnk4QIX+75J2C4uAXtxYcEwrYM/KukEC7POu6Nf7K0R/+GVSH2s7BRDGG U3ZLgzfVU5SLAEypqNZfVDUzYFGCPtyvlSevpvub8tO8m4YU5KDKfIK4DjiTCk1UBpMI 09BvNsfA7w9qnb7X1tBYay5eWF82rws8BMhfyG2/zPog7ALaO9NArOoEyRRni+OJRanR XXbjgFdKHwRMbeXho8pFLYZ4JTYdmqmm7oYLAYBj80CuCMKIyuREIJZAPv8fvwQyiH77 0N43U5MYesmMSqPpqt5o2UZwEevOU2AcOBdFOh/SGOzkzA+H5z/x/pRBd9L2vODckXLz jtgg== X-Gm-Message-State: APjAAAUeKO6k20Dyj7lN05lj8W03AvWzM78W0xg8f/4EkLnpk2KMW9Ma cyzqqLEdFFcbZoVZrGtWSAQUegI7nE6IipHoexcPAny6jBxUIjMDKL9dK0KlmliZyPQdMl6bHFT TVjkSyHF7FtqcBrDWbZxUcMd7EH7AsOw4KCd/iddml69D12USc1Q24p5FzQVm4SCLfg== X-Received: by 2002:a17:902:8ec7:: with SMTP id x7mr10475884plo.224.1565221064516; Wed, 07 Aug 2019 16:37:44 -0700 (PDT) X-Google-Smtp-Source: APXvYqxj4ZcOPNzlMWG3DPWPA9MZpquDyNLAYxG8UcvaNMoVDWRRBRHgwPcH420K6cPSizxrDpLO X-Received: by 2002:a17:902:8ec7:: with SMTP id x7mr10475857plo.224.1565221063880; Wed, 07 Aug 2019 16:37:43 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1565221063; cv=none; d=google.com; s=arc-20160816; b=rN0Z9DjDUIAktIxDK76n9VrbB72dHUA3pV0ODkGky4z7oDW7MfRqbt8vjBaJgSh/2C H/0Dodzaxn7bGcBKnD4duPQYf1fA71PJqvENMSa8JKtGEjpguM3FcFdB/XUcUNZCXxM6 v0Wzv1SpSbGRKHwW03C3ClU2xYVtnyYPo9X7f3nHLLsHqvn+RDtEM0xz7kDhe6ANq4TV QCkS7uJcRWmH3rfi6QS3EKL2PDtQZ71+/MkqoJzPHQ3lqwpcXG720h6QaDoARLm2PC6w /8szDtWYOccA9h/dKm9VJ6tAbx0E3pR4vJjZaZKwDhwVuTr3I14GwPXichsUurKYoiu6 bTOQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:references:in-reply-to:message-id:date:subject :smtp-origin-cluster:cc:to:smtp-origin-hostname:from :smtp-origin-hostprefix:dkim-signature; bh=+zWjU0C6LD6HpRrP4wreVSMF6ug2Y3cK0xwApLG5ZA4=; b=iWpZaJA2VY2FUdCjRZ9ZW1yp/yoypshkBnVd7BnvNzU5K/hweeSmyiee3QiLG0KgDP qe1YQXl4rcSVwKslBytinUN6uhpLGEtQAH89rpZUou6iEXlPCvE48BMdRgzgMmZ2n3zh QPPfb+Y7cMjKn2k1NK4q0FgOSQHBtXrbdqueq1d8vqHMcgBTbrlqOdmFPHwn0UmgxsgN HyTIITJZitDr04cggTxQVRY9knW8IHi1FcunfB88kZCFXFNE0DqBynRpqtdjmSTJXVco scSpau69O0NjlDtt3K2Fhv/29ZVAZYp1SPRpuxqItH1IWE0k2ySb6RyUD1fNO9lwqHPU mTPQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@fb.com header.s=facebook header.b=fBsqb63h; spf=pass (google.com: domain of prvs=31225916b7=songliubraving@fb.com designates 67.231.145.42 as permitted sender) smtp.mailfrom="prvs=31225916b7=songliubraving@fb.com"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=fb.com Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com. [67.231.145.42]) by mx.google.com with ESMTPS id f59si51365781plf.220.2019.08.07.16.37.43 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 07 Aug 2019 16:37:43 -0700 (PDT) Received-SPF: pass (google.com: domain of prvs=31225916b7=songliubraving@fb.com designates 67.231.145.42 as permitted sender) client-ip=67.231.145.42; Authentication-Results: mx.google.com; dkim=pass header.i=@fb.com header.s=facebook header.b=fBsqb63h; spf=pass (google.com: domain of prvs=31225916b7=songliubraving@fb.com designates 67.231.145.42 as permitted sender) smtp.mailfrom="prvs=31225916b7=songliubraving@fb.com"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=fb.com Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x77NbOgh012893 for ; Wed, 7 Aug 2019 16:37:43 -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=fBsqb63hUdkjfm3MVSkoshMICce62OK0B0pWD24A0iTxFYJJFooPgx4TMwhbAYMZuikx KPOvmn3+GSl0HOhokd8YHWYB0F5QFPR0VDY6WjjBR2cuANN0w484i9z+8tpXEE9Wyq9X OeDCnBjge64sKhBPNskFtf+TpJ59YZMzWz4= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 2u87ueg4jw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 07 Aug 2019 16:37:43 -0700 Received: from mx-out.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::f) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Wed, 7 Aug 2019 16:37:42 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 42B5562E2D9E; Wed, 7 Aug 2019 16:37:41 -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 v12 4/6] uprobe: use FOLL_SPLIT_PMD instead of FOLL_SPLIT Date: Wed, 7 Aug 2019 16:37:27 -0700 Message-ID: <20190807233729.3899352-5-songliubraving@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190807233729.3899352-1-songliubraving@fb.com> References: <20190807233729.3899352-1-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=2019-08-07_07:,, 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=809 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908070209 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