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Petersen" , "hch@infradead.org" CC: Naohiro Aota , "linux-btrfs@vger.kernel.org" , "dsterba@suse.com" , "hare@suse.com" , "linux-fsdevel@vger.kernel.org" , Johannes Thumshirn Subject: Re: [PATCH v8 01/41] block: add bio_add_zone_append_page Thread-Topic: [PATCH v8 01/41] block: add bio_add_zone_append_page Thread-Index: AQHWmCICMDDhRg8S9EGeqVQ0V4cAqg== Date: Tue, 6 Oct 2020 05:12:08 +0000 Message-ID: References: <20201005134319.GA11537@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: oracle.com; dkim=none (message not signed) header.d=none;oracle.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [2400:2411:43c0:6000:1d8:5f02:9c5c:7c1f] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 639d718a-9838-4af7-6da1-08d869b6600f x-ms-traffictypediagnostic: CY4PR04MB0968: x-ld-processed: b61c8803-16f3-4c35-9b17-6f65f441df86,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 6vEJTUwi89xQsRnaqRZEi1ghmTtXwWuYu62VqBbFZv9l1f0ANQIqpQOWaHHk5bO822vNeEeTtvz/sMMtdTSCC1mxTZWup9EnUX11EX9YoMrU8Io0/s19iL5hmHdnIMz6wa0c5MFpHrpjYkvKpJist0KJoSQyzK5Zp3jRedPIRzEovqJlcNgc1h1rZERD5kwQ5rqr3CXYBA5SagIKyJqnM7qWVVuvO+ZEXWJzS8eomeRJ1vX68zjdm9YJfMIyqiB8liaVj2FaApo07CsLWSva8A+kBZqXUY4Z2T01pWJMxo/DVHbfl+ed4RERPjvSQiBl x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CY4PR04MB3751.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(396003)(39860400002)(376002)(346002)(366004)(136003)(2906002)(8676002)(86362001)(9686003)(316002)(83380400001)(54906003)(64756008)(76116006)(66476007)(66556008)(91956017)(66446008)(186003)(66946007)(110136005)(55016002)(7696005)(4326008)(53546011)(6506007)(8936002)(71200400001)(478600001)(5660300002)(33656002)(52536014);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR04MB3751.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 639d718a-9838-4af7-6da1-08d869b6600f X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Oct 2020 05:12:08.8183 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ODzbCreHGbeVvUAUm54MuNKvvwgdhHG4WQhn8R7omprBCu+f129eRKVfYLNLh6Q5qyrK2oxbQFZ7afJE/wfmXw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR04MB0968 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 2020/10/06 10:27, Martin K. Petersen wrote:=0A= > =0A= > Christoph,=0A= > =0A= >>> max_zone_append_sectors also appears to be gated exclusively by hardwar= e=0A= >>> constraints. Is there user-controllable limit in place for append=0A= >>> operations?=0A= >>=0A= >> Zone Append operations can't be split, as they return the first written= =0A= >> LBA to the caller. If you'd split it you'd now need to return multiple= =0A= >> start LBA values.=0A= > =0A= > Yep, this limit would have to be enforced at the top.=0A= > =0A= > Anyway, not sure how important this is given modern drives. I just know= =0A= > that for our workloads the soft limit is something we almost always end= =0A= > up tweaking.=0A= =0A= We can fix the max_zone_append_sectors limit independently of this btrfs se= ries.=0A= Right now, this attribute represents the hardware limit but we can easily r= ename=0A= it to max_hw_zone_append_sectors and define a soft max_zone_append_sectors = which=0A= would be min(max_sectors, max_hw_zone_append_sectors). That will result in= =0A= similar soft limit control as for regular writes & max_sectors/max_hw_secto= rs.=0A= =0A= -- =0A= Damien Le Moal=0A= Western Digital Research=0A=