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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: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MAXP287CA0005.INDP287.PROD.OUTLOOK.COM (2603:1096:a00:49::16) To AM9PR08MB7120.eurprd08.prod.outlook.com (2603:10a6:20b:3dc::22) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: AM9PR08MB7120:EE_|PAWPR08MB8984:EE_|DU6PEPF0000B622:EE_|DU0PR08MB7996:EE_ X-MS-Office365-Filtering-Correlation-Id: 3c197324-1dfd-4ad7-d52b-08ddae72ec57 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2025 14:17:57.0167 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3c197324-1dfd-4ad7-d52b-08ddae72ec57 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: DU6PEPF0000B622.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB7996 X-Rspam-User: X-Rspamd-Queue-Id: 96FA84000D X-Rspamd-Server: rspam02 X-Stat-Signature: mh64p7sm4wixygj996z79h839o98ewdx X-HE-Tag: 1750256281-706769 X-HE-Meta: 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 CW9D0jYI 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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 7:37 pm, Lorenzo Stoakes wrote: > On Wed, Jun 18, 2025 at 07:28:16PM +0530, Dev Jain wrote: >> On 18/06/25 5:27 pm, Lorenzo Stoakes wrote: >>> On Wed, Jun 18, 2025 at 05:15:50PM +0530, Dev Jain wrote: >>> 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. > Umm, what? You mean overcommit all mode, and that has no bearing on the max > mapping count check. > > In do_mmap(): > > /* Too many mappings? */ > if (mm->map_count > sysctl_max_map_count) > return -ENOMEM; > > > As well as numerous other checks in mm/vma.c. Ah sorry, didn't look at the code properly just assumed that overcommit_always meant overriding this. > > I'm not sure why an overcommit toggle is even necessary when you could use > MAP_NORESERVE or simply map PROT_NONE to avoid the OVERCOMMIT_GUESS limits? > > I'm pretty confused as to what this test is really achieving honestly. This > isn't a useful way of asserting mmap() behaviour as far as I can tell. Well, seems like a useful way to me at least : ) Not sure if you are in the mood to discuss that but if you'd like me to explain from start to end what the test is doing, I can do that : )