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To: Lorenzo Stoakes Cc: Aboorva Devarajan , akpm@linux-foundation.org, Liam.Howlett@oracle.com, shuah@kernel.org, pfalcato@suse.de, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, baohua@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, donettom@linux.ibm.com, ritesh.list@gmail.com References: <20250616160632.35250-1-aboorvad@linux.ibm.com> <20250616160632.35250-2-aboorvad@linux.ibm.com> <0665a8d3-7094-4732-9518-01ac313959e1@arm.com> <159f6939-e7c8-492c-8195-b7e8787a08f1@lucifer.local> <79bdd993-0e9c-4d7d-b42c-4b5750eff140@lucifer.local> <8e23c5d3-6ce3-4fe8-b6fe-69658d5d0727@lucifer.local> Content-Language: en-US From: Dev Jain In-Reply-To: <8e23c5d3-6ce3-4fe8-b6fe-69658d5d0727@lucifer.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA1PR01CA0167.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:d::15) To AM9PR08MB7120.eurprd08.prod.outlook.com (2603:10a6:20b:3dc::22) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: AM9PR08MB7120:EE_|DU0PR08MB10360:EE_|AM3PEPF0000A79C:EE_|DB9PR08MB9489:EE_ X-MS-Office365-Filtering-Correlation-Id: 844d1206-f691-474b-a496-08ddae70451a x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|366016|1800799024|7416014|376014; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2025 13:58:57.4419 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 844d1206-f691-474b-a496-08ddae70451a 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: AM3PEPF0000A79C.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB9489 X-Rspamd-Queue-Id: 875501C0010 X-Stat-Signature: q1t78ch1hhyaks94mbrhxm79beh11xu4 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1750255143-175551 X-HE-Meta: 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 j7fcXukw 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 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: List-Subscribe: List-Unsubscribe: On 18/06/25 5:27 pm, Lorenzo Stoakes wrote: > On Wed, Jun 18, 2025 at 05:15:50PM +0530, Dev Jain wrote: >> On 18/06/25 5:07 pm, Lorenzo Stoakes wrote: >>> On Wed, Jun 18, 2025 at 04:58:56PM +0530, Dev Jain wrote: >>>> MAP_CHUNK_SIZE was chosen randomly. Good to see it translates into something logical : ) >>>> >>>> So I guess I am correct, if we can find two VMAs (except at the edge of the high addr boundary) >>>> with a gap of greater than MAP_CHUNK_SIZE then there is a bug in mmap(). >>> No haha, not at all!! Firstly fixed addressed override a lot of this, secondly >>> the 256 page gap (which is configurable btw) is only applicable for mappings >>> below a stack (in stack grow down arch). >> Sorry, I was making that assertion w.r.t this specific selftest. What the test >> is doing is exhausting VA space without passing a hint or MAP_FIXED. With this >> context, where does this assertion fail? One of them will be if the stack guard >> gap is more than 256 pages. > Are you accounting for sys.max_map_count? If not, then you'll be hitting that > first. run_vmtests.sh will run the test in overcommit mode so that won't be an issue. > >> Also, note that the test hasn't reported frequent failures post my change, so >> in general settings, w.r.t this test, the assertion experimentally seems to >> be true : ) > I don't really have time to dig into the test in detail sorry too much else on > at the moment. > > But it isn't a big problem even if it happened to turn out that this test isn't > really testing quite what you expected :)