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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jun 2025 11:23:21.8541 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d1b63d34-e17c-40e1-637e-08ddb7c8859d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B9D.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB7885 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250630_042327_141976_A622F682 X-CRM114-Status: GOOD ( 10.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 30/06/25 4:15 pm, Ryan Roberts wrote: > On 30/06/2025 04:33, Dev Jain wrote: >> On 30/06/25 4:35 am, Andrew Morton wrote: >>> On Sat, 28 Jun 2025 17:04:31 +0530 Dev Jain wrote: >>> >>>> This patchset optimizes the mprotect() system call for large folios >>>> by PTE-batching. No issues were observed with mm-selftests, build >>>> tested on x86_64. >>> um what.  Seems to claim that "selftests still compiles after I messed >>> with stuff", which isn't very impressive ;)  Please clarify? >> Sorry I mean to say that the mm-selftests pass. > I think you're saying you both compiled and ran the mm selftests for arm64. And > additionally you compiled for x86_64? (Just trying to help clarify). Yes, ran mm-selftests on arm64, and build-tested the patches for x86. > >>>> We use the following test cases to measure performance, mprotect()'ing >>>> the mapped memory to read-only then read-write 40 times: >>>> >>>> Test case 1: Mapping 1G of memory, touching it to get PMD-THPs, then >>>> pte-mapping those THPs >>>> Test case 2: Mapping 1G of memory with 64K mTHPs >>>> Test case 3: Mapping 1G of memory with 4K pages >>>> >>>> Average execution time on arm64, Apple M3: >>>> Before the patchset: >>>> T1: 7.9 seconds   T2: 7.9 seconds   T3: 4.2 seconds >>>> >>>> After the patchset: >>>> T1: 2.1 seconds   T2: 2.2 seconds   T3: 4.3 seconds >>> Well that's tasty. >>> >>>> Observing T1/T2 and T3 before the patchset, we also remove the regression >>>> introduced by ptep_get() on a contpte block. And, for large folios we get >>>> an almost 74% performance improvement, albeit the trade-off being a slight >>>> degradation in the small folio case. >>>> >