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Wed, 11 Sep 2024 09:38:45 +0000 Message-ID: <156cfeac-bc29-47ef-a296-b523a619234e@arm.com> Date: Wed, 11 Sep 2024 10:38:42 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue Content-Language: en-US To: Mike Galbraith , Peter Zijlstra Cc: Dietmar Eggemann , Vincent Guittot , Hongyan Xia , mingo@redhat.com, juri.lelli@redhat.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org, kprateek.nayak@amd.com, wuyun.abel@bytedance.com, youssefesmat@chromium.org, tglx@linutronix.de References: <20240905145354.GP4723@noisy.programming.kicks-ass.net> <20240906104525.GG4928@noisy.programming.kicks-ass.net> <8d0d01b9-a430-49cc-93a5-67b4d68aa35c@arm.com> <20240910140524.GH4723@noisy.programming.kicks-ass.net> <52ca4cea-8f65-434e-af17-e4bf664d9488@arm.com> <20240911084528.GJ4723@noisy.programming.kicks-ass.net> <4fde8f26a9aeaeafda15b81bbb17b0ffc96941f0.camel@gmx.de> From: Luis Machado In-Reply-To: <4fde8f26a9aeaeafda15b81bbb17b0ffc96941f0.camel@gmx.de> Content-Type: text/plain; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2024 09:38:55.1057 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c75ecbf2-a957-47fd-eb92-08dcd2458db0 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: AM4PEPF00027A5D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB10170 On 9/11/24 10:10, Mike Galbraith wrote: > On Wed, 2024-09-11 at 10:45 +0200, Peter Zijlstra wrote: >> On Wed, Sep 11, 2024 at 09:35:16AM +0100, Luis Machado wrote: >>>> >>>> I'm assuming that removing the usage sites restores function? >>> >>> It does restore function if we remove the usage. >>> >>> From an initial look: >>> >>> cat /sys/kernel/debug/sched/debug | grep -i delay                                                                                                                                                                                                                             >>>   .h_nr_delayed                  : -4 >>>   .h_nr_delayed                  : -6 >>>   .h_nr_delayed                  : -1 >>>   .h_nr_delayed                  : -6 >>>   .h_nr_delayed                  : -1 >>>   .h_nr_delayed                  : -1 >>>   .h_nr_delayed                  : -5 >>>   .h_nr_delayed                  : -6 >>> >>> So probably an unexpected decrement or lack of an increment somewhere. >> >> Yeah, that's buggered. Ok, I'll go rebase sched/core and take this patch >> out. I'll see if I can reproduce that. > > Hm, would be interesting to know how the heck he's triggering that. > > My x86_64 box refuses to produce any such artifacts with anything I've > tossed at it, including full LTP with enterprise RT and !RT configs, > both in master and my local SLE15-SP7 branch. Hohum. > > -Mike >From what I can tell, the decrement that makes h_nr_delayed go negative is in the dequeue_entities path. First: if (!task_sleep && !task_delayed) h_nr_delayed = !!se->sched_delayed; h_nr_delayed is 1 here. Then we decrement cfs_rq->h_nr_delayed below: cfs_rq->h_nr_running -= h_nr_running; cfs_rq->idle_h_nr_running -= idle_h_nr_running; cfs_rq->h_nr_delayed -= h_nr_delayed;