From: Valentin Schneider <valentin.schneider@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>,
linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
tip-bot2 for Giovanni Gherdovich <tip-bot2@linutronix.de>,
Giovanni Gherdovich <ggherdovich@suse.cz>,
Ingo Molnar <mingo@kernel.org>,
Doug Smythies <dsmythies@telus.net>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
x86 <x86@kernel.org>
Subject: Re: [tip: sched/core] x86, sched: Add support for frequency invariance
Date: Mon, 30 Mar 2020 17:03:04 +0100 [thread overview]
Message-ID: <jhjimil25l3.mognet@arm.com> (raw)
In-Reply-To: <20200330125219.GM20696@hirez.programming.kicks-ass.net>
On Mon, Mar 30 2020, Peter Zijlstra wrote:
> +static void init_freq_invariance(bool secondary)
> {
> bool ret = false;
>
> - if (smp_processor_id() != 0 || !boot_cpu_has(X86_FEATURE_APERFMPERF))
> + if (!boot_cpu_has(X86_FEATURE_APERFMPERF))
> return;
>
> + if (secondary) {
> + if (static_branch_likely(&arch_scale_freq_key)) {
> + init_counter_refs(NULL);
> + }
> + return;
> + }
> +
Oh doh, that's an "enable once and for all" thing. That makes much more
sense; sorry for the noise.
next prev parent reply other threads:[~2020-03-30 16:03 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 15:16 [PATCH v5 0/6] Add support for frequency invariance for (some) x86 Giovanni Gherdovich
2020-01-22 15:16 ` [PATCH v5 1/6] x86,sched: Add support for frequency invariance Giovanni Gherdovich
2020-01-29 11:32 ` [tip: sched/core] x86, sched: " tip-bot2 for Giovanni Gherdovich
2020-03-30 11:05 ` Chris Wilson
2020-03-30 11:30 ` Valentin Schneider
2020-03-30 12:52 ` Peter Zijlstra
2020-03-30 16:03 ` Valentin Schneider [this message]
2020-03-31 18:11 ` Giovanni Gherdovich
2020-03-31 18:33 ` Chris Wilson
2020-01-22 15:16 ` [PATCH v5 2/6] x86,sched: Add support for frequency invariance on SKYLAKE_X Giovanni Gherdovich
2020-01-29 11:32 ` [tip: sched/core] x86, sched: " tip-bot2 for Giovanni Gherdovich
2020-01-22 15:16 ` [PATCH v5 3/6] x86,sched: Add support for frequency invariance on XEON_PHI_KNL/KNM Giovanni Gherdovich
2020-01-29 11:32 ` [tip: sched/core] x86, sched: " tip-bot2 for Giovanni Gherdovich
2020-01-22 15:16 ` [PATCH v5 4/6] x86,sched: Add support for frequency invariance on ATOM_GOLDMONT* Giovanni Gherdovich
2020-01-29 11:32 ` [tip: sched/core] x86, sched: " tip-bot2 for Giovanni Gherdovich
2020-01-22 15:16 ` [PATCH v5 5/6] x86,sched: Add support for frequency invariance on ATOM Giovanni Gherdovich
2020-01-29 11:32 ` [tip: sched/core] x86, sched: " tip-bot2 for Giovanni Gherdovich
2020-01-22 15:16 ` [PATCH v5 6/6] x86: intel_pstate: handle runtime turbo disablement/enablement in freq. invariance Giovanni Gherdovich
2020-01-29 11:32 ` [tip: sched/core] x86/intel_pstate: Handle runtime turbo disablement/enablement in frequency invariance tip-bot2 for Giovanni Gherdovich
2020-01-23 15:30 ` [PATCH v5 0/6] Add support for frequency invariance for (some) x86 Rafael J. Wysocki
2020-01-23 15:44 ` Peter Zijlstra
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