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Wed, 11 Sep 2024 10:46:17 +0000 Message-ID: <5d1d55e1-3d2c-4487-b91c-639187e1546c@arm.com> Date: Wed, 11 Sep 2024 11:46:08 +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: <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> From: Luis Machado In-Reply-To: <20240911084528.GJ4723@noisy.programming.kicks-ass.net> Content-Type: text/plain; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Sep 2024 10:46:33.7040 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d53f4926-e57a-493a-df95-08dcd24f00cd 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: AMS1EPF00000042.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB8483 On 9/11/24 09:45, Peter Zijlstra wrote: > On Wed, Sep 11, 2024 at 09:35:16AM +0100, Luis Machado wrote: >> 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. > > Yeah, that's buggered. Ok, I'll go rebase sched/core and take this patch > out. I'll see if I can reproduce that. Before reverting it, let me run a few more checks first. Dietmar tells me he sees sane values for h_nr_delayed on a juno system. I just want to make sure I'm not hitting some oddness with the 6.8 kernel on the pixel 6.