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Wed, 11 Sep 2024 08:35:19 +0000 Message-ID: <52ca4cea-8f65-434e-af17-e4bf664d9488@arm.com> Date: Wed, 11 Sep 2024 09:35:16 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue Content-Language: en-US To: 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, efault@gmx.de References: <629937b1-6f97-41d1-aa4f-7349c2ffa29d@arm.com> <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> From: Luis Machado In-Reply-To: <20240910140524.GH4723@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO4P123CA0018.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:150::23) To PR3PR08MB5852.eurprd08.prod.outlook.com (2603:10a6:102:8e::21) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: PR3PR08MB5852:EE_|PA4PR08MB7521:EE_|AM3PEPF00009B9F:EE_|GV1PR08MB8449:EE_ X-MS-Office365-Filtering-Correlation-Id: 150db77f-e73c-4155-7e30-08dcd23cb746 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|366016|376014|7416014|1800799024; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2024 08:35:39.4020 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 150db77f-e73c-4155-7e30-08dcd23cb746 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: AM3PEPF00009B9F.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR08MB8449 On 9/10/24 15:05, Peter Zijlstra wrote: > On Tue, Sep 10, 2024 at 12:04:11PM +0100, Luis Machado wrote: >> I gave the above patch a try on our Android workload running on the Pixel 6 with a 6.8-based kernel. >> >> First I'd like to confirm that Dietmar's fix that was pushed to tip:sched/core (Fix util_est >> accounting for DELAY_DEQUEUE) helps bring the frequencies and power use down to more sensible levels. >> >> As for the above changes, unfortunately I'm seeing high frequencies and high power usage again. The >> pattern looks similar to what we observed with the uclamp inc/dec imbalance. > > :-( > >> I haven't investigated this in depth yet, but I'll go stare at some traces and the code, and hopefully >> something will ring bells. > > So first thing to do is trace h_nr_delayed I suppose, in my own > (limited) testing that was mostly [0,1] correctly correlating to there > being a delayed task on the runqueue. > > 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.