From: Frederic Weisbecker <frederic@kernel•org>
To: LKML <linux-kernel@vger•kernel.org>
Cc: Frederic Weisbecker <frederic@kernel•org>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel•org>,
"Rafael J. Wysocki" <rafael@kernel•org>,
Alexander Gordeev <agordeev@linux•ibm.com>,
Anna-Maria Behnsen <anna-maria@linutronix•de>,
Ben Segall <bsegall@google•com>,
Boqun Feng <boqun.feng@gmail•com>,
Christian Borntraeger <borntraeger@linux•ibm.com>,
Dietmar Eggemann <dietmar.eggemann@arm•com>,
Heiko Carstens <hca@linux•ibm.com>,
Ingo Molnar <mingo@redhat•com>,
Jan Kiszka <jan.kiszka@siemens•com>,
Joel Fernandes <joelagnelf@nvidia•com>,
Juri Lelli <juri.lelli@redhat•com>,
Kieran Bingham <kbingham@kernel•org>,
Madhavan Srinivasan <maddy@linux•ibm.com>,
Mel Gorman <mgorman@suse•de>,
Michael Ellerman <mpe@ellerman•id.au>,
Neeraj Upadhyay <neeraj.upadhyay@kernel•org>,
Nicholas Piggin <npiggin@gmail•com>,
"Paul E . McKenney" <paulmck@kernel•org>,
Peter Zijlstra <peterz@infradead•org>,
Steven Rostedt <rostedt@goodmis•org>,
Sven Schnelle <svens@linux•ibm.com>,
Thomas Gleixner <tglx@linutronix•de>,
Uladzislau Rezki <urezki@gmail•com>,
Valentin Schneider <vschneid@redhat•com>,
Vasily Gorbik <gor@linux•ibm.com>,
Vincent Guittot <vincent.guittot@linaro•org>,
Viresh Kumar <viresh.kumar@linaro•org>,
Xin Zhao <jackzxcui1989@163•com>,
linux-pm@vger•kernel.org, linux-s390@vger•kernel.org,
linuxppc-dev@lists•ozlabs.org
Subject: [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test
Date: Fri, 16 Jan 2026 15:52:00 +0100 [thread overview]
Message-ID: <20260116145208.87445-8-frederic@kernel.org> (raw)
In-Reply-To: <20260116145208.87445-1-frederic@kernel.org>
cpufreq calls get_cpu_idle_time_us() just to know if idle cputime
accounting has a nanoseconds granularity.
Use the appropriate indicator instead to make that deduction.
Signed-off-by: Frederic Weisbecker <frederic@kernel•org>
---
drivers/cpufreq/cpufreq_ondemand.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index a6ecc203f7b7..2d52ee035702 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -334,17 +334,12 @@ static void od_free(struct policy_dbs_info *policy_dbs)
static int od_init(struct dbs_data *dbs_data)
{
struct od_dbs_tuners *tuners;
- u64 idle_time;
- int cpu;
tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
if (!tuners)
return -ENOMEM;
- cpu = get_cpu();
- idle_time = get_cpu_idle_time_us(cpu, NULL);
- put_cpu();
- if (idle_time != -1ULL) {
+ if (tick_nohz_enabled) {
/* Idle micro accounting is supported. Use finer thresholds */
dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
} else {
--
2.51.1
next prev parent reply other threads:[~2026-01-16 14:53 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-16 14:51 [PATCH 00/15] tick/sched: Refactor idle cputime accounting Frederic Weisbecker
2026-01-16 14:51 ` [PATCH 01/15] sched/idle: Handle offlining first in idle loop Frederic Weisbecker
2026-01-19 12:53 ` Peter Zijlstra
2026-01-19 21:04 ` Frederic Weisbecker
2026-01-20 4:26 ` K Prateek Nayak
2026-01-20 14:52 ` Frederic Weisbecker
2026-01-16 14:51 ` [PATCH 02/15] sched/cputime: Remove superfluous and error prone kcpustat_field() parameter Frederic Weisbecker
2026-01-16 14:51 ` [PATCH 03/15] sched/cputime: Correctly support generic vtime idle time Frederic Weisbecker
2026-01-19 13:02 ` Peter Zijlstra
2026-01-19 21:35 ` Frederic Weisbecker
2026-01-16 14:51 ` [PATCH 04/15] powerpc/time: Prepare to stop elapsing in dynticks-idle Frederic Weisbecker
2026-02-25 17:53 ` Christophe Leroy (CS GROUP)
2026-01-16 14:51 ` [PATCH 05/15] s390/time: " Frederic Weisbecker
2026-01-21 12:17 ` Heiko Carstens
2026-01-21 18:04 ` Frederic Weisbecker
2026-01-22 14:40 ` Heiko Carstens
2026-01-27 14:45 ` Frederic Weisbecker
2026-01-16 14:51 ` [PATCH 06/15] tick/sched: Unify idle cputime accounting Frederic Weisbecker
2026-01-19 14:26 ` Peter Zijlstra
2026-01-19 22:00 ` Frederic Weisbecker
2026-01-16 14:52 ` Frederic Weisbecker [this message]
2026-01-19 5:37 ` [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test Viresh Kumar
2026-01-19 12:30 ` Rafael J. Wysocki
2026-01-19 22:06 ` Frederic Weisbecker
2026-01-20 12:32 ` Rafael J. Wysocki
2026-01-20 14:28 ` Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 08/15] tick/sched: Remove nohz disabled special case in cputime fetch Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 09/15] tick/sched: Move dyntick-idle cputime accounting to cputime code Frederic Weisbecker
2026-01-19 14:35 ` Peter Zijlstra
2026-01-19 22:08 ` Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 10/15] tick/sched: Remove unused fields Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 11/15] tick/sched: Account tickless idle cputime only when tick is stopped Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 12/15] tick/sched: Consolidate idle time fetching APIs Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 13/15] sched/cputime: Consolidate get_cpu_[idle|iowait]_time_us() Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 14/15] sched/cputime: Handle idle irqtime gracefully Frederic Weisbecker
2026-01-16 14:52 ` [PATCH 15/15] sched/cputime: Handle dyntick-idle steal time correctly Frederic Weisbecker
2026-01-16 14:57 ` [PATCH 00/15] tick/sched: Refactor idle cputime accounting Frederic Weisbecker
2026-01-20 12:42 ` Shrikanth Hegde
2026-01-21 16:55 ` Frederic Weisbecker
2026-01-19 14:53 ` Peter Zijlstra
2026-01-19 22:12 ` Frederic Weisbecker
-- strict thread matches above, loose matches on Subject: below --
2026-02-06 14:22 [PATCH 00/15 v2] " Frederic Weisbecker
2026-02-06 14:22 ` [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test Frederic Weisbecker
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