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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: <20250616160632.35250-2-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> <815793f1-6800-4b9a-852e-f13d6308f50f@arm.com> <2756fa2b-e8bf-4c66-bf9b-c85dc63dfc33@lucifer.local> Content-Language: en-US From: Dev Jain In-Reply-To: <2756fa2b-e8bf-4c66-bf9b-c85dc63dfc33@lucifer.local> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA0PR01CA0059.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:ac::19) To AM9PR08MB7120.eurprd08.prod.outlook.com (2603:10a6:20b:3dc::22) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: AM9PR08MB7120:EE_|AS8PR08MB5943:EE_|AMS0EPF000001A2:EE_|AS8PR08MB8157:EE_ X-MS-Office365-Filtering-Correlation-Id: 173a3eb7-0801-4947-5dc0-08ddae76a37b x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|376014|7416014|1800799024|366016; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2025 14:44:32.7750 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 173a3eb7-0801-4947-5dc0-08ddae76a37b 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: AMS0EPF000001A2.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8157 X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: 3163D120014 X-Stat-Signature: ntarb5kgiayebg7pwynfzgjba7qwehck X-HE-Tag: 1750257878-589135 X-HE-Meta: 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 m7VxkwEZ 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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 8:05 pm, Lorenzo Stoakes wrote: > On Wed, Jun 18, 2025 at 07:47:18PM +0530, Dev Jain wrote: >> 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. > No problem! It's hard to be aware of everything in mm :) > >>> 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 : ) >> > I just don't have time right now, I guess I'll have to come back to it > later... it's not the end of the world for it to be iffy in my view as long as > it passes, but it might just not be of great value. > > Philosophically I'd rather we didn't assert internal implementation details like > where we place mappings in userland memory. At no point do we promise to not > leave larger gaps if we feel like it :) You have a fair point. Anyhow a debate for another day. > > I'm guessing, reading more, the _real_ test here is some mathematical assertion > about layout from HIGH_ADDR_SHIFT -> end of address space when using hints. > > But again I'm not sure that achieves much and again also is asserting internal > implementation details. > > Correct behaviour of this kind of thing probably better belongs to tests in the > userland VMA testing I'd say. > > Sorry I don't mean to do down work you've done before, just giving an honest > technical appraisal! Nah, it will be rather hilarious to see it all go down the drain xD > > Anyway don't let this block work to fix the test if it's failing. We can revisit > this later. Sure. @Aboorva and Donet, I still believe that the correct approach is to elide the gap check at the crossing boundary. What do you think?