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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Nov 2024 12:07:03.0191 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9ac1f15c-4455-4b94-44b2-08dcfe5b8671 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: DU2PEPF0001E9C0.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB6329 Hi, On 11/6/24 11:09, Peter Zijlstra wrote: > On Wed, Nov 06, 2024 at 11:49:00AM +0530, K Prateek Nayak wrote: > >> Since delayed entities are still on the runqueue, they can affect PELT >> calculation. Vincent and Dietmar have both noted this and Peter posted >> https://lore.kernel.org/lkml/172595576232.2215.18027704125134691219.tip-bot2@tip-bot2/ >> in response but it was pulled out since Luis reported observing -ve >> values for h_nr_delayed on his setup. A lot has been fixed around >> delayed dequeue since and I wonder if now would be the right time to >> re-attempt h_nr_delayed tracking. > > Yeah, it's something I meant to get back to. I think the patch as posted > was actually right and it didn't work for Luis because of some other, > since fixed issue. > > But I might be misremembering things. I'll get to it eventually :/ Sorry for the late reply, I got sidetracked on something else. There have been a few power regressions (based on our Pixel6-based testing) due to the delayed-dequeue series. The main one drove the frequencies up due to an imbalance in the uclamp inc/dec handling. That has since been fixed by "[PATCH 10/24] sched/uclamg: Handle delayed dequeue". [1] The bug also made it so disabling DELAY_DEQUEUE at runtime didn't fix things, because the imbalance/stale state would be perpetuated. Disabling DELAY_DEQUEUE before boot did fix things. So power use was brought down by the above fix, but some issues still remained, like the accounting issues with h_nr_running and not taking sched_delayed tasks into account. Dietmar addressed some of it with "kernel/sched: Fix util_est accounting for DELAY_DEQUEUE". [2] Peter sent another patch to add accounting for sched_delayed tasks [3]. Though the patch was mostly correct, under some circumstances [4] we spotted imbalances in the sched_delayed accounting that slowly drove frequencies up again. If I recall correctly, Peter has pulled that particular patch from the tree, but we should definitely revisit it with a proper fix for the imbalance. Suggestion in [5]. [1] https://lore.kernel.org/lkml/20240727105029.315205425@infradead.org/ [2] https://lore.kernel.org/lkml/c49ef5fe-a909-43f1-b02f-a765ab9cedbf@arm.com/ [3] https://lore.kernel.org/lkml/172595576232.2215.18027704125134691219.tip-bot2@tip-bot2/ [4] https://lore.kernel.org/lkml/6df12fde-1e0d-445f-8f8a-736d11f9ee41@arm.com/ [5] https://lore.kernel.org/lkml/6df12fde-1e0d-445f-8f8a-736d11f9ee41@arm.com/