From: Peter Zijlstra <peterz@infradead.org>
To: Giovanni Gherdovich <ggherdovich@suse.cz>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@suse.de>,
Len Brown <lenb@kernel.org>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
x86@kernel.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org,
Mel Gorman <mgorman@techsingularity.net>,
Matt Fleming <matt@codeblueprint.co.uk>,
Viresh Kumar <viresh.kumar@linaro.org>,
Juri Lelli <juri.lelli@redhat.com>, Paul Turner <pjt@google.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Quentin Perret <qperret@qperret.net>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Doug Smythies <dsmythies@telus.net>
Subject: Re: [PATCH v2 1/2] x86,sched: Add support for frequency invariance
Date: Wed, 2 Oct 2019 20:27:55 +0200 [thread overview]
Message-ID: <20191002182754.GD4643@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20191002122926.385-2-ggherdovich@suse.cz>
On Wed, Oct 02, 2019 at 02:29:25PM +0200, Giovanni Gherdovich wrote:
> +void x86_arch_scale_freq_tick_enable(void)
> +{
> + tick_disable = false;
> +}
> +
> +static void reset_scale_freq(void *arg)
> +{
> + this_cpu_write(arch_cpu_freq, SCHED_CAPACITY_SCALE);
> +}
> +
> +void x86_arch_scale_freq_tick_disable(void)
> +{
> + on_each_cpu(reset_scale_freq, NULL, 1);
> + tick_disable = true;
I'm thikning this ought to be the other way around, otherwise we can get
a tick loosing the 1024 we just wrote in arch_cpu_freq.
> +}
You've lost the prev_{a,m}perf update, so the first tick after enable
will see 'funny' values.
next prev parent reply other threads:[~2019-10-02 18:28 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-02 12:29 [PATCH v2 0/2] Add support for frequency invariance for (some) x86 Giovanni Gherdovich
2019-10-02 12:29 ` [PATCH v2 1/2] x86,sched: Add support for frequency invariance Giovanni Gherdovich
2019-10-02 15:23 ` kbuild test robot
2019-10-02 15:49 ` Giovanni Gherdovich
2019-10-02 16:43 ` kbuild test robot
2019-10-02 18:27 ` Peter Zijlstra [this message]
2019-10-03 10:27 ` Rafael J. Wysocki
2019-10-03 12:15 ` Peter Zijlstra
2019-10-03 17:36 ` Srinivas Pandruvada
2019-10-03 17:53 ` Rafael J. Wysocki
2019-10-04 11:48 ` Peter Zijlstra
2019-10-08 7:48 ` Giovanni Gherdovich
2019-10-08 9:32 ` Rafael J. Wysocki
2019-10-02 12:29 ` [PATCH v2 2/2] cpufreq: intel_pstate: Conditional frequency invariant accounting Giovanni Gherdovich
2019-10-03 18:05 ` Rafael J. Wysocki
2019-10-04 3:31 ` Srinivas Pandruvada
2019-10-04 8:08 ` Rafael J. Wysocki
2019-10-04 8:29 ` Giovanni Gherdovich
2019-10-04 8:28 ` Vincent Guittot
2019-10-04 8:33 ` Rafael J. Wysocki
2019-10-04 8:29 ` Rafael J. Wysocki
2019-10-04 8:57 ` Giovanni Gherdovich
2019-10-04 9:17 ` Rafael J. Wysocki
2019-10-04 15:17 ` Srinivas Pandruvada
2019-10-07 8:33 ` Giovanni Gherdovich
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