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Thu, 29 Sep 2022 22:38:15 +0000 Date: Thu, 29 Sep 2022 15:38:12 -0700 From: Dan Williams To: Alistair Popple , Dan Williams CC: , Matthew Wilcox , "Jan Kara" , "Darrick J. Wong" , Jason Gunthorpe , Christoph Hellwig , John Hubbard , , , , , Subject: Re: [PATCH v2 12/18] devdax: Move address_space helpers to the DAX core Message-ID: <63361e5471f48_795a6294be@dwillia2-xfh.jf.intel.com.notmuch> References: <166329930818.2786261.6086109734008025807.stgit@dwillia2-xfh.jf.intel.com> <166329937873.2786261.10966526479509910698.stgit@dwillia2-xfh.jf.intel.com> <87y1u5jpus.fsf@nvdebian.thelocal> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <87y1u5jpus.fsf@nvdebian.thelocal> X-ClientProxiedBy: BYAPR06CA0034.namprd06.prod.outlook.com (2603:10b6:a03:d4::47) To MWHPR1101MB2126.namprd11.prod.outlook.com (2603:10b6:301:50::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWHPR1101MB2126:EE_|SN7PR11MB7091:EE_ X-MS-Office365-Filtering-Correlation-Id: 8cefcad1-bc00-42d3-2974-08daa26b4c25 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR1101MB2126.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(136003)(346002)(39860400002)(396003)(366004)(376002)(451199015)(83380400001)(38100700002)(82960400001)(66476007)(86362001)(66556008)(316002)(186003)(66946007)(110136005)(478600001)(41300700001)(6666004)(54906003)(8936002)(6512007)(9686003)(6486002)(7416002)(2906002)(4326008)(26005)(8676002)(5660300002)(6506007);DIR:OUT;SFP:1102; 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t=1664491100; a=rsa-sha256; cv=fail; b=IDWPlgaQ2QjeSjYT4lxzqisHuCgzQ30T2PBcE4+YKv0Ns34wtbipbAZrqxbKtZ0bYyw2+W mmqoLZEDXQpR7z+wXmLUY3F/3Z9gP72nE9gR/HYP5krkRZucZnKHvqUUR4hScxPSv4FipO J8SVQZmXtvZmqVo9VVHJaoMRkwGVzU8= Authentication-Results: imf16.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b="UKit/fs7"; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (imf16.hostedemail.com: domain of dan.j.williams@intel.com designates 134.134.136.100 as permitted sender) smtp.mailfrom=dan.j.williams@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Rspam-User: X-Stat-Signature: 6zn47uwz3dz9nn85kns78roory14wyaz X-Rspamd-Queue-Id: A9FEB18000F X-Rspamd-Server: rspam08 X-HE-Tag: 1664491100-685107 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: Alistair Popple wrote: > > Dan Williams writes: > > [...] > > > +/** > > + * dax_zap_mappings_range - find first pinned page in @mapping > > + * @mapping: address space to scan for a page with ref count > 1 > > + * @start: Starting offset. Page containing 'start' is included. > > + * @end: End offset. Page containing 'end' is included. If 'end' is LLONG_MAX, > > + * pages from 'start' till the end of file are included. > > + * > > + * DAX requires ZONE_DEVICE mapped pages. These pages are never > > + * 'onlined' to the page allocator so they are considered idle when > > + * page->count == 1. A filesystem uses this interface to determine if > > Minor nit-pick I noticed while reading this but shouldn't that be > "page->count == 0" now? I put this patch set down for a couple days to attend a conference and now I am warming up my cache again. I believe the patch to make this zero based comes later in this series, but I definitely did not come back and fix this up in that patch, so good catch!