From: Linus Torvalds <torvalds@linux-foundation.org>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Juri Lelli <juri.lelli@redhat.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Valentin Schneider <vschneid@redhat.com>
Subject: Re: [GIT PULL] Scheduler changes for v6.8
Date: Thu, 11 Jan 2024 09:45:15 -0800 [thread overview]
Message-ID: <CAHk-=wj75Er8k4QY-KF34NBCWkDpr3D26XptOpkfDcTyGEA7iA@mail.gmail.com> (raw)
In-Reply-To: <ZZ+ixagkxRPYyTCE@vingu-book>
On Thu, 11 Jan 2024 at 00:11, Vincent Guittot
<vincent.guittot@linaro.org> wrote:
>
> Could you confirm that cpufreq governor is schedutil and the driver is
> amd-pstate on your system ?
schedutil yes, amd-pstate no. I actually just use acpi_cpufreq
>
> Also I'm interested by the output of the amd_pstate to confirm that it uses the
> adjust_perf callback
>
> I suppose that you don't use uclamp feature and amd doesn't use EAS so that let
> the change of the min parameter of adjust_perf which was probably always 0
> unless you use deadline scheduler and which now takes into account irq pressure.
>
> Could you try the patch below which restores the previous min value ?
>
> ---
> kernel/sched/cpufreq_schedutil.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
> index 95c3c097083e..3fe8ac6ce9cc 100644
> --- a/kernel/sched/cpufreq_schedutil.c
> +++ b/kernel/sched/cpufreq_schedutil.c
> @@ -194,10 +194,11 @@ unsigned long sugov_effective_cpu_perf(int cpu, unsigned long actual,
> static void sugov_get_util(struct sugov_cpu *sg_cpu, unsigned long boost)
> {
> unsigned long min, max, util = cpu_util_cfs_boost(sg_cpu->cpu);
> + struct rq *rq = cpu_rq(sg_cpu->cpu);
>
> util = effective_cpu_util(sg_cpu->cpu, util, &min, &max);
> util = max(util, boost);
> - sg_cpu->bw_min = min;
> + sg_cpu->bw_min = cpu_bw_dl(rq);
> sg_cpu->util = sugov_effective_cpu_perf(sg_cpu->cpu, util, min, max);
> }
>
> @@ -442,7 +443,7 @@ static void sugov_update_single_perf(struct update_util_data *hook, u64 time,
> sugov_cpu_is_busy(sg_cpu) && sg_cpu->util < prev_util)
> sg_cpu->util = prev_util;
>
> - cpufreq_driver_adjust_perf(sg_cpu->cpu, sg_cpu->bw_min,
> + cpufreq_driver_adjust_perf(sg_cpu->cpu, map_util_perf(sg_cpu->bw_min),
> sg_cpu->util, max_cap);
>
> sg_cpu->sg_policy->last_freq_update_time = time;
> --
> 2.34.1
>
>
> >
> > I'll keep that revert in my private test-tree for now (so that I have
> > a working machine again), but I'll move it to my main branch soon
> > unless somebody has a quick fix for this problem.
> >
> > Linus
next prev parent reply other threads:[~2024-01-11 17:45 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-28 12:23 [GIT PULL] Scheduler changes for v6.7 Ingo Molnar
2023-10-30 23:50 ` pr-tracker-bot
2024-01-08 14:07 ` [GIT PULL] Scheduler changes for v6.8 Ingo Molnar
2024-01-09 4:04 ` pr-tracker-bot
2024-01-10 22:19 ` Linus Torvalds
2024-01-10 22:41 ` Linus Torvalds
2024-01-10 22:57 ` Linus Torvalds
2024-01-11 8:11 ` Vincent Guittot
2024-01-11 17:45 ` Linus Torvalds [this message]
2024-01-11 17:53 ` Linus Torvalds
2024-01-11 18:16 ` Vincent Guittot
2024-01-12 14:23 ` Dietmar Eggemann
2024-01-12 16:58 ` Vincent Guittot
2024-01-12 18:18 ` Qais Yousef
2024-01-12 19:03 ` Vincent Guittot
2024-01-12 20:30 ` Linus Torvalds
2024-01-12 20:49 ` Linus Torvalds
2024-01-12 21:04 ` Linus Torvalds
2024-01-13 1:04 ` Qais Yousef
2024-01-13 1:24 ` Linus Torvalds
2024-01-13 1:31 ` Linus Torvalds
2024-01-13 10:47 ` Vincent Guittot
2024-01-13 18:33 ` Qais Yousef
2024-01-13 18:37 ` Qais Yousef
2024-01-11 11:09 ` [GIT PULL] scheduler fixes Ingo Molnar
2024-01-11 13:04 ` Vincent Guittot
2024-01-11 20:48 ` [PATCH] Revert "sched/cpufreq: Rework schedutil governor performance estimation" and dependent commit Ingo Molnar
2024-01-11 22:22 ` Vincent Guittot
2024-01-12 18:24 ` Ingo Molnar
2024-01-12 18:26 ` [GIT PULL] Scheduler changes for v6.8 Ingo Molnar
2024-01-14 9:12 ` Wyes Karny
2024-01-14 11:18 ` Vincent Guittot
2024-01-14 12:37 ` Wyes Karny
2024-01-14 13:02 ` Dietmar Eggemann
2024-01-14 13:05 ` Vincent Guittot
2024-01-14 13:03 ` Vincent Guittot
2024-01-14 15:12 ` Qais Yousef
2024-01-14 15:20 ` Vincent Guittot
2024-01-14 19:58 ` Qais Yousef
2024-01-14 23:37 ` Qais Yousef
2024-01-15 6:25 ` Wyes Karny
2024-01-15 11:59 ` Qais Yousef
2024-01-15 8:21 ` Vincent Guittot
2024-01-15 12:09 ` Qais Yousef
2024-01-15 13:26 ` Vincent Guittot
2024-01-15 14:03 ` Dietmar Eggemann
2024-01-15 15:26 ` Vincent Guittot
2024-01-15 20:05 ` Dietmar Eggemann
2024-01-15 8:42 ` David Laight
2024-01-14 18:11 ` Wyes Karny
2024-01-14 18:18 ` Vincent Guittot
2024-01-11 9:33 ` Ingo Molnar
2024-01-11 11:14 ` [tip: sched/urgent] Revert "sched/cpufreq: Rework schedutil governor performance estimation" and dependent commits tip-bot2 for Ingo Molnar
2024-01-11 20:55 ` [tip: sched/urgent] Revert "sched/cpufreq: Rework schedutil governor performance estimation" and dependent commit tip-bot2 for Ingo Molnar
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