Messages in this thread | | | Date | Thu, 30 Nov 2017 14:22:34 +0100 | From | Juri Lelli <> | Subject | Re: [PATCH v3 3/6] cpufreq: schedutil: update CFS util only if used |
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Hi,
On 30/11/17 11:47, Patrick Bellasi wrote: > Currently the utilization of the FAIR class is collected before locking > the policy. Although that should not be a big issue for most cases, we > also don't really know how much latency there can be between the > utilization reading and its usage. > > Let's get the FAIR utilization right before its usage to be better in > sync with the current status of a CPU. > > Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com> > Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > Cc: Viresh Kumar <viresh.kumar@linaro.org> > Cc: linux-kernel@vger.kernel.org > Cc: linux-pm@vger.kernel.org > > --- > Changes from v2: > - rebased on v4.15-rc1 > > Change-Id: I9291a560bcad7db76894e3f0fcdb917511d0479e > --- > kernel/sched/cpufreq_schedutil.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c > index 448f49de5335..40521d59630b 100644 > --- a/kernel/sched/cpufreq_schedutil.c > +++ b/kernel/sched/cpufreq_schedutil.c > @@ -351,10 +351,9 @@ static void sugov_update_shared(struct update_util_data *hook, u64 time, > unsigned int next_f; > bool rt_mode; > > - sugov_get_util(&util, &max, sg_cpu->cpu); > - > raw_spin_lock(&sg_policy->update_lock); > > + sugov_get_util(&util, &max, sg_cpu->cpu); > sg_cpu->util = util; > sg_cpu->max = max;
Patch looks good.
Reviewed-by: Juri Lelli <juri.lelli@redhat.com>
However, not sure $SUBJECT is really in sync with what the patch does? CFS gets "used" before and after the patch... last paragraph of the changelog looks more like it. :)
Best,
Juri
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