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Harding" CC: Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Matthew Wilcox , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 0/4] mm: Use slab_list list_head instead of lru Thread-Topic: [PATCH 0/4] mm: Use slab_list list_head instead of lru Thread-Index: AQHU16bt6o0Uju0YQ0mKx1ZofK0W1KYG6H2A Date: Mon, 11 Mar 2019 20:49:23 +0000 Message-ID: <20190311204919.GA20002@tower.DHCP.thefacebook.com> References: <20190311010744.5862-1-tobin@kernel.org> In-Reply-To: <20190311010744.5862-1-tobin@kernel.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MW2PR16CA0010.namprd16.prod.outlook.com (2603:10b6:907::23) To BYAPR15MB2631.namprd15.prod.outlook.com (2603:10b6:a03:152::24) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [2620:10d:c090:200::1:b487] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1513610c-37d5-48a2-42b0-08d6a6630b07 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600127)(711020)(4605104)(2017052603328)(7153060)(7193020);SRVR:BYAPR15MB3238; x-ms-traffictypediagnostic: BYAPR15MB3238: x-microsoft-exchange-diagnostics: 1;BYAPR15MB3238;20:w3xRwUjIi+NTnsrogAPt1myxQYxymgia9zadw3C+I2fZSq8tZc2qo5SyNFKZmZkfzwmJY5adfHowZCMtSXgHG29ixcXmaXVM1GdN6UvblxJP66WJagBL6WD0pRFdofpSN0hw/7ppKYyG+MCGQTTsRpLY9QWM4vZw1M8CdoBEKY0= x-microsoft-antispam-prvs: x-forefront-prvs: 09730BD177 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(366004)(136003)(39860400002)(376002)(346002)(396003)(199004)(189003)(33656002)(6116002)(9686003)(86362001)(4326008)(7736002)(25786009)(305945005)(68736007)(2906002)(6512007)(476003)(71200400001)(71190400001)(486006)(446003)(53936002)(97736004)(6246003)(14454004)(11346002)(478600001)(256004)(316002)(81166006)(46003)(1076003)(6916009)(8676002)(54906003)(81156014)(5660300002)(105586002)(106356001)(6436002)(8936002)(6486002)(99286004)(76176011)(52116002)(229853002)(6506007)(386003)(102836004)(186003);DIR:OUT;SFP:1102;SCL:1;SRVR:BYAPR15MB3238;H:BYAPR15MB2631.namprd15.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX: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: 0mlUCiGzU42LsFyAb0lZMkFztYdHCnQvroCw4B7saadbY7/94FEsNTsnJSTJ1yoMQq3pI1g3mG6BIuzR2E9AQoF2KReMqBb4fmsH33xytcHJY9bpHalU1MNyvlV7dPW2ylVWHjuxQwLiKi2OrA39wlt46x4Mj7Mpx/6hHOdn+B751lVxeMBDQldNjmJl2zoyo5tC0rAggRE+ea3PDUvheHTxXCItEXgMdKvccRJoc76g0eLAvZb6ozC0cWa0Tdlec0qh6D/QCwXn8aUjUI+0CS995W47VYUlAXrHsCNErSbhnZc+sUWAw3EtZy9MtpPDuXdggzCFvqyUdCE3U5QuuTSmKMDMLxMWxAailOPTIpbDqRR4lM6kOj/gKNXIr7OTlXvGXszcM0+Zpt3wVmC6x6e9/QNAnlxMPfGS1uxOFVw= Content-Type: text/plain; charset="us-ascii" Content-ID: <0067C8991FF0D646978183C4E83070A5@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 1513610c-37d5-48a2-42b0-08d6a6630b07 X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Mar 2019 20:49:23.9654 (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-Transport-CrossTenantHeadersStamped: BYAPR15MB3238 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-03-11_16:,, signatures=0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe 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 Mon, Mar 11, 2019 at 12:07:40PM +1100, Tobin C. Harding wrote: > Currently the slab allocators (ab)use the struct page 'lru' list_head. > We have a list head for slab allocators to use, 'slab_list'. >=20 > Clean up all three allocators by using the 'slab_list' list_head instead > of overloading the 'lru' list_head. >=20 > Initial patch makes no code changes, adds comments to #endif statements. >=20 > Final 3 patches do changes as a patch per allocator, tested by building > and booting (in Qemu) after configuring kernel to use appropriate > allocator. Also build and boot with debug options enabled (for slab > and slub). Hi Tobin! The patchset looks good to me, however I'd add some clarifications why switching from lru to slab_list is safe. My understanding is that the slab_list fields isn't currently in use, but it's not that obvious that putting slab_list and next/pages/pobjects fields into a union is safe (for the slub case). Please, add a clarification/comment. For patches 1, 3 and 4: Reviewed-by: Roman Gushchin Thanks!