From: Quentin Perret <qperret@qperret.net>
To: Giovanni Gherdovich <ggherdovich@suse.cz>
Cc: srinivas.pandruvada@linux.intel.com, tglx@linutronix.de,
mingo@redhat.com, peterz@infradead.org, bp@suse.de,
lenb@kernel.org, rjw@rjwysocki.net, x86@kernel.org,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
mgorman@techsingularity.net, matt@codeblueprint.co.uk,
viresh.kumar@linaro.org, juri.lelli@redhat.com, pjt@google.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com
Subject: Re: [PATCH 1/2] x86,sched: Add support for frequency invariance
Date: Tue, 17 Sep 2019 16:39:37 +0200 [thread overview]
Message-ID: <20190917143937.GA334@qperret.net> (raw)
In-Reply-To: <1568730466.3329.4.camel@suse.cz>
On Tuesday 17 Sep 2019 at 16:27:46 (+0200), Giovanni Gherdovich wrote:
> I'll check what's the cost of static_cpu_has() and if it's non-negligible I'll
> do what you suggest (x86-specific version of arch_scale_freq_invariant().
In case this is indeed expensive to check, you could always add a static
key, set at boot time, to optimize things a bit ... That might be worth
it since this is called in latency-sensitive paths of the scheduler.
Thanks,
Quentin
next prev parent reply other threads:[~2019-09-17 14:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 2:42 [PATCH 0/2] Add support for frequency invariance for (some) x86 Giovanni Gherdovich
2019-09-09 2:42 ` [PATCH 1/2] x86,sched: Add support for frequency invariance Giovanni Gherdovich
2019-09-11 15:28 ` Doug Smythies
2019-09-13 20:58 ` Doug Smythies
2019-09-17 14:25 ` Giovanni Gherdovich
2019-09-19 14:42 ` Doug Smythies
2019-09-24 8:06 ` Mel Gorman
2019-09-24 17:52 ` Doug Smythies
2019-09-13 22:52 ` Srinivas Pandruvada
2019-09-17 14:27 ` Giovanni Gherdovich
2019-09-17 15:55 ` Vincent Guittot
2019-09-19 23:55 ` Srinivas Pandruvada
2019-09-14 10:57 ` Quentin Perret
2019-09-17 14:27 ` Giovanni Gherdovich
2019-09-17 14:39 ` Quentin Perret [this message]
2019-09-24 14:03 ` Peter Zijlstra
2019-09-24 16:00 ` Peter Zijlstra
2019-10-02 12:27 ` Giovanni Gherdovich
2019-10-02 18:45 ` Peter Zijlstra
2019-09-24 16:04 ` Peter Zijlstra
2019-10-02 12:26 ` Giovanni Gherdovich
2019-10-02 18:35 ` Peter Zijlstra
2019-09-24 16:30 ` Peter Zijlstra
2019-10-02 12:25 ` Giovanni Gherdovich
2019-10-02 18:47 ` Peter Zijlstra
2019-09-09 2:42 ` [PATCH 2/2] cpufreq: intel_pstate: Conditional frequency invariant accounting Giovanni Gherdovich
2019-09-24 16:01 ` [PATCH 0/2] Add support for frequency invariance for (some) x86 Peter Zijlstra
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