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Thu, 30 May 2019 17:24:42 +0000 From: Song Liu To: William Kucharski CC: LKML , Linux-MM , "namit@vmware.com" , Peter Zijlstra , "oleg@redhat.com" , Steven Rostedt , "mhiramat@kernel.org" , Matthew Wilcox , "kirill.shutemov@linux.intel.com" , Kernel Team , "Chad Mynhier" , "mike.kravetz@oracle.com" Subject: Re: [PATCH uprobe, thp 3/4] uprobe: support huge page by only splitting the pmd Thread-Topic: [PATCH uprobe, thp 3/4] uprobe: support huge page by only splitting the pmd Thread-Index: AQHVFma7iu6PqkG6zkadRvREvp8axaaDg0iAgABpC4A= Date: Thu, 30 May 2019 17:24:42 +0000 Message-ID: <564E2603-C77C-408A-9E51-B20266407360@fb.com> References: <20190529212049.2413886-1-songliubraving@fb.com> <20190529212049.2413886-4-songliubraving@fb.com> <6D76CB61-CF13-4610-A883-0C25ECC5CFB7@oracle.com> In-Reply-To: <6D76CB61-CF13-4610-A883-0C25ECC5CFB7@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3445.104.11) x-originating-ip: [2620:10d:c090:200::3:bc80] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: bc89de3d-f609-49d5-3c25-08d6e523b3ce x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:BN6PR15MB1441; x-ms-traffictypediagnostic: BN6PR15MB1441: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; x-forefront-prvs: 00531FAC2C x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(136003)(346002)(376002)(39860400002)(366004)(396003)(189003)(199004)(6512007)(256004)(6436002)(76116006)(73956011)(186003)(229853002)(6246003)(8936002)(7416002)(6486002)(99286004)(66946007)(4326008)(91956017)(102836004)(53936002)(6116002)(66476007)(66556008)(64756008)(66446008)(57306001)(33656002)(25786009)(478600001)(14454004)(6916009)(2906002)(36756003)(76176011)(6506007)(486006)(8676002)(86362001)(46003)(7736002)(50226002)(54906003)(5660300002)(68736007)(4744005)(53546011)(71200400001)(81166006)(81156014)(476003)(2616005)(446003)(11346002)(316002)(83716004)(82746002)(305945005)(71190400001)(14583001);DIR:OUT;SFP:1102;SCL:1;SRVR:BN6PR15MB1441;H:BN6PR15MB1154.namprd15.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: fb.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: gP/dd2a2N4q5o2sBPjM+mn7HBWbn3a0fvTgh8Flq39DKJ75YxDdeEi8CGjKVZIr7N1OsnkDikyTHR9JHKHW1iOKF633EWcjZv9E0+nHF2NRn6+7uvPnYG+MIhrzQ2tDu8AHmeDEULspgHrvpsVPNyq60T4Myp7G8vZmI3oTyxq+cVQHHVJFHo0K0oShsz9k3c4yNSGHJgp9HyvxpyFvqnY5iJO+cuIaX7BiJH5MvoSLHHC23uT1EwKApTx41C0lIlRqCWtmicBz8IPXeGRg6+QNmxzfCYQL4vV/LheofT2yPq+ZVwwMWsSh2js1QxiuPkwCkb44tmAc93pmWk6hN6EIq/MdYryvH9fPL7zfRqQdRHfg/AnpuziCAxLcmCxRalHq33SF6ZPU5z8a2JUXK+42Dc5uFAs6hvucqg6Jgxj0= Content-Type: text/plain; charset="us-ascii" Content-ID: <2AC4C67832FD484DB240662BBA37899A@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: bc89de3d-f609-49d5-3c25-08d6e523b3ce X-MS-Exchange-CrossTenant-originalarrivaltime: 30 May 2019 17:24:42.0515 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: songliubraving@fb.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR15MB1441 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-30_10:,, 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905300122 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: > On May 30, 2019, at 4:08 AM, William Kucharski wrote: >=20 >=20 > Is there any reason to worry about supporting PUD-sized uprobe pages if > CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD is defined? I would prefer > not to bake in the assumption that "huge" means PMD-sized and more than > it already is. >=20 > For example, if CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD is configured, > mm_address_trans_huge() should either make the call to pud_trans_huge() > if appropriate, or a VM_BUG_ON_PAGE should be added in case the routine > is ever called with one. >=20 > Otherwise it looks pretty reasonable to me. >=20 > -- Bill >=20 I will try that in v2.=20 Thanks, Song=