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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Dec 2024 09:23:50.3448 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81d5f34b-6bc6-4d3f-dc06-08dd12b30848 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF000001B1.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS4PR08MB7685 On 12/2/24 09:17, Vincent Guittot wrote: > On Sun, 1 Dec 2024 at 14:30, Mike Galbraith wrote: >> >> Greetings, >> >> On Fri, 2024-11-29 at 17:17 +0100, Vincent Guittot wrote: >>> Delayed dequeued feature keeps a sleeping sched_entitiy enqueued until its >>> lag has elapsed. As a result, it stays also visible in the statistics that >>> are used to balance the system and in particular the field h_nr_running. >>> >>> This serie fixes those metrics by creating a new h_nr_queued that tracks >>> all queued tasks. It renames h_nr_running into h_nr_runnable and restores >>> the behavior of h_nr_running i.e. tracking the number of fair tasks that >>> want to run. >>> >>> h_nr_runnable is used in several places to make decision on load balance: >>> - PELT runnable_avg >>> - deciding if a group is overloaded or has spare capacity >>> - numa stats >>> - reduced capacity management >>> - load balance between groups >> >> I took the series for a spin in tip v6.12-10334-gb1b238fba309, but >> runnable seems to have an off-by-one issue, causing it to wander ever >> further south. >> >> patches 1-3 applied. >> .h_nr_runnable : -3046 >> .runnable_avg : 450189777126 > > Yeah, I messed up something around finish_delayed_dequeue_entity(). > I'm' going to prepare a v3> Maybe something similar to what I ran into here? https://lore.kernel.org/lkml/6df12fde-1e0d-445f-8f8a-736d11f9ee41@arm.com/ >> >> full set applied. >> .h_nr_runnable : -5707 >> .runnable_avg : 4391793519526 >> >> -Mike