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Thu, 22 Aug 2024 10:28:01 +0000 Message-ID: <83a20d85-de7a-4fe6-8cd8-5a96d822eb6b@arm.com> Date: Thu, 22 Aug 2024 11:28:01 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue Content-Language: en-US To: Vincent Guittot Cc: Hongyan Xia , Peter Zijlstra , mingo@redhat.com, juri.lelli@redhat.com, dietmar.eggemann@arm.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: <20240727102732.960974693@infradead.org> <20240727105029.315205425@infradead.org> <6f39e567-fd9a-4157-949d-7a9ccd9c3592@arm.com> <1debbea4-a0cf-4de9-9033-4f6135a156ed@arm.com> From: Luis Machado In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO4P123CA0693.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:37b::9) 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_|DBBPR08MB10795:EE_|AMS1EPF00000049:EE_|DB9PR08MB9947:EE_ X-MS-Office365-Filtering-Correlation-Id: 64d46fd5-7910-4f8a-696a-08dcc29521e4 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2024 10:28:15.3831 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 64d46fd5-7910-4f8a-696a-08dcc29521e4 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: AMS1EPF00000049.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB9947 On 8/22/24 10:53, Vincent Guittot wrote: > On Thu, 22 Aug 2024 at 11:22, Luis Machado wrote: >> >> On 8/22/24 09:19, Vincent Guittot wrote: >>> Hi, >>> >>> On Wed, 21 Aug 2024 at 15:34, Hongyan Xia wrote: >>>> >>>> Hi Peter, >>>> >>>> Sorry for bombarding this thread in the last couple of days. I'm seeing >>>> several issues in the latest tip/sched/core after these patches landed. >>>> >>>> What I'm now seeing seems to be an unbalanced call of util_est. First, I applied >>> >>> I also see a remaining util_est for idle rq because of an unbalance >>> call of util_est_enqueue|dequeue >>> >> >> I can confirm issues with the utilization values and frequencies being driven >> seemingly incorrectly, in particular for little cores. >> >> What I'm seeing with the stock series is high utilization values for some tasks >> and little cores having their frequencies maxed out for extended periods of >> time. Sometimes for 5+ or 10+ seconds, which is excessive as the cores are mostly >> idle. But whenever certain tasks get scheduled there, they have a very high util >> level and so the frequency is kept at max. >> >> As a consequence this drives up power usage. >> >> I gave Hongyan's draft fix a try and observed a much more reasonable behavior for >> the util numbers and frequencies being used for the little cores. With his fix, >> I can also see lower energy use for my specific benchmark. > > The main problem is that the util_est of a delayed dequeued task > remains on the rq and keeps the rq utilization high and as a result > the frequency higher than needed. > > The below seems to works for me and keep sync the enqueue/dequeue of > uti_test with the enqueue/dequeue of the task as if de dequeue was not > delayed > > Another interest is that we will not try to migrate a delayed dequeue > sleeping task that doesn't actually impact the current load of the cpu > and as a result will not help in the load balance. I haven't yet fully > checked what would happen with hotplug Thanks. Those are good points. Let me go and try your patch.