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CAT:NONE; SFS:(4636009)(136003)(39860400002)(396003)(376002)(346002)(36840700001)(46966006)(31696002)(186003)(36906005)(316002)(34020700004)(54906003)(36756003)(26005)(4326008)(2906002)(82310400003)(7416002)(86362001)(110136005)(70586007)(70206006)(8676002)(36860700001)(16526019)(47076005)(8936002)(7636003)(53546011)(426003)(2616005)(356005)(478600001)(7696005)(83380400001)(31686004)(82740400003)(336012)(5660300002)(21314003)(43740500002); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Mar 2021 18:58:12.9807 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dfe69c7b-7971-444a-46ae-08d8e2641fc9 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT045.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR1201MB0074 Subject: Re: [Nouveau] [PATCH v4 4/8] mm/rmap: Split migration into its own function X-BeenThere: nouveau@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Nouveau development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, kvm-ppc@vger.kernel.org, Christoph Hellwig Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: nouveau-bounces@lists.freedesktop.org Sender: "Nouveau" On 3/3/21 10:16 PM, Alistair Popple wrote: > Migration is currently implemented as a mode of operation for > try_to_unmap_one() generally specified by passing the TTU_MIGRATION flag > or in the case of splitting a huge anonymous page TTU_SPLIT_FREEZE. > > However it does not have much in common with the rest of the unmap > functionality of try_to_unmap_one() and thus splitting it into a > separate function reduces the complexity of try_to_unmap_one() making it > more readable. > > Several simplifications can also be made in try_to_migrate_one() based > on the following observations: > > - All users of TTU_MIGRATION also set TTU_IGNORE_MLOCK. > - No users of TTU_MIGRATION ever set TTU_IGNORE_HWPOISON. > - No users of TTU_MIGRATION ever set TTU_BATCH_FLUSH. > > TTU_SPLIT_FREEZE is a special case of migration used when splitting an > anonymous page. This is most easily dealt with by calling the correct > function from unmap_page() in mm/huge_memory.c - either > try_to_migrate() for PageAnon or try_to_unmap(). > > Signed-off-by: Alistair Popple > Reviewed-by: Christoph Hellwig Looks reasonable to me. I do worry a bit about code duplication. At some point in the future, it might be discovered that other combinations of TTU_XXX flags are needed in which case a careful check of try_to_migrate() and try_to_unmap() will be needed. Reviewed-by: Ralph Campbell _______________________________________________ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau