From nobody Sat Feb 7 21:14:57 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D57E33F0763; Fri, 6 Feb 2026 14:23:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770387833; cv=none; b=QxagZzRDte+WT3A2AX+Jmi4e9pvGemoCnGOzQOCWuCQEEKOSg4lvPOZA2VRISzeDXXyZU/zxdcItO4rJOGNPmi5qMPOudoSaZ811yr1PGc124c4+8xGz0Q4UypB89uvHV7hjL3iaq82tzn0LEQg8YtbU6PwoMWEhHNr6HJRsmfI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770387833; c=relaxed/simple; bh=E9zTeO5x+KjyNgewXK9Mi3ZXHv+NiD0HDMZoN+zshlE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uFV+moBnlBrwy60AFYGuyuNJ7irhfnjYso1cPH9GWQCibsxTEqJbQDKERgljWikPA9nGq0ru/mqOG6DrV1BY0OgqCjTtIvac9RJoBaH1tLdoj0B15TCkLUriu37X9WxKPnhxMXkf84MtCtm1KzEyZ72eizcvxI2Kbw8R7bb45QE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kFmGLTxE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kFmGLTxE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0AE5C116C6; Fri, 6 Feb 2026 14:23:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770387833; bh=E9zTeO5x+KjyNgewXK9Mi3ZXHv+NiD0HDMZoN+zshlE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kFmGLTxEaIrIJJzRiPyrmfO9obNPSzQIgdiRScbMZu6qmx1Q6FtQ3R9Aw+6E8sRP1 3HtC8F8wo9w5y4hyRZiXDWe6Yoq2bgTp2n8jPUF3eJ6HQBvK+/pJ9k1rbP08KaVmzm ZlV4GHCqJz3b4bCL4bpJyQm/uQ7FP1PYUfH4bOW6rvOZ1dWtTlSgNXYl+BX1RnSr67 yzI4+xZbT6c/vJnJYNf9zWE2vAXmLgUjA2AWtc/XVqEC4McNjBgteT+FxFDp9kUWts KcmTfBVhmkCrD0QQgxfkHNsLefiRvPn55fMJFTNwmnJgP5m43MOuO0Hw8OxB1AGwKO cytjZ4krynFmA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , "Christophe Leroy (CS GROUP)" , "Rafael J. Wysocki" , Alexander Gordeev , Anna-Maria Behnsen , Ben Segall , Boqun Feng , Christian Borntraeger , Dietmar Eggemann , Heiko Carstens , Ingo Molnar , Jan Kiszka , Joel Fernandes , Juri Lelli , Kieran Bingham , Madhavan Srinivasan , Mel Gorman , Michael Ellerman , Neeraj Upadhyay , Nicholas Piggin , "Paul E . McKenney" , Peter Zijlstra , Steven Rostedt , Sven Schnelle , Thomas Gleixner , Uladzislau Rezki , Valentin Schneider , Vasily Gorbik , Vincent Guittot , Viresh Kumar , Xin Zhao , linux-pm@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Shrikanth Hegde Subject: [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test Date: Fri, 6 Feb 2026 15:22:37 +0100 Message-ID: <20260206142245.58987-8-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260206142245.58987-1-frederic@kernel.org> References: <20260206142245.58987-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- drivers/cpufreq/cpufreq_ondemand.c | 7 +------ include/linux/tick.h | 2 ++ kernel/time/hrtimer.c | 2 +- kernel/time/tick-internal.h | 2 -- kernel/time/tick-sched.c | 8 +++++++- kernel/time/timer.c | 2 +- 6 files changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_o= ndemand.c index a6ecc203f7b7..bb7db82930e4 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_db= s) static int od_init(struct dbs_data *dbs_data) { struct od_dbs_tuners *tuners; - u64 idle_time; - int cpu; =20 tuners =3D kzalloc(sizeof(*tuners), GFP_KERNEL); if (!tuners) return -ENOMEM; =20 - cpu =3D get_cpu(); - idle_time =3D get_cpu_idle_time_us(cpu, NULL); - put_cpu(); - if (idle_time !=3D -1ULL) { + if (tick_nohz_is_active()) { /* Idle micro accounting is supported. Use finer thresholds */ dbs_data->up_threshold =3D MICRO_FREQUENCY_UP_THRESHOLD; } else { diff --git a/include/linux/tick.h b/include/linux/tick.h index ac76ae9fa36d..738007d6f577 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -126,6 +126,7 @@ enum tick_dep_bits { =20 #ifdef CONFIG_NO_HZ_COMMON extern bool tick_nohz_enabled; +extern bool tick_nohz_is_active(void); extern bool tick_nohz_tick_stopped(void); extern bool tick_nohz_tick_stopped_cpu(int cpu); extern void tick_nohz_idle_stop_tick(void); @@ -142,6 +143,7 @@ extern u64 get_cpu_idle_time_us(int cpu, u64 *last_upda= te_time); extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); #else /* !CONFIG_NO_HZ_COMMON */ #define tick_nohz_enabled (0) +static inline bool tick_nohz_is_active(void) { return false; } static inline int tick_nohz_tick_stopped(void) { return 0; } static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; } static inline void tick_nohz_idle_stop_tick(void) { } diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index f8ea8c8fc895..e1bbf883dfa8 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -943,7 +943,7 @@ void clock_was_set(unsigned int bases) cpumask_var_t mask; int cpu; =20 - if (!hrtimer_hres_active(cpu_base) && !tick_nohz_active) + if (!hrtimer_hres_active(cpu_base) && !tick_nohz_is_active()) goto out_timerfd; =20 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index 4e4f7bbe2a64..597d816d22e8 100644 --- a/kernel/time/tick-internal.h +++ b/kernel/time/tick-internal.h @@ -156,7 +156,6 @@ static inline void tick_nohz_init(void) { } #endif =20 #ifdef CONFIG_NO_HZ_COMMON -extern unsigned long tick_nohz_active; extern void timers_update_nohz(void); extern u64 get_jiffies_update(unsigned long *basej); # ifdef CONFIG_SMP @@ -171,7 +170,6 @@ extern void timer_expire_remote(unsigned int cpu); # endif #else /* CONFIG_NO_HZ_COMMON */ static inline void timers_update_nohz(void) { } -#define tick_nohz_active (0) #endif =20 DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 21ac561a8545..81c619bf662c 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -691,7 +691,7 @@ void __init tick_nohz_init(void) * NO HZ enabled ? */ bool tick_nohz_enabled __read_mostly =3D true; -unsigned long tick_nohz_active __read_mostly; +static unsigned long tick_nohz_active __read_mostly; /* * Enable / Disable tickless mode */ @@ -702,6 +702,12 @@ static int __init setup_tick_nohz(char *str) =20 __setup("nohz=3D", setup_tick_nohz); =20 +bool tick_nohz_is_active(void) +{ + return tick_nohz_active; +} +EXPORT_SYMBOL_GPL(tick_nohz_is_active); + bool tick_nohz_tick_stopped(void) { struct tick_sched *ts =3D this_cpu_ptr(&tick_cpu_sched); diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 1f2364126894..7e1e3bde6b8b 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -281,7 +281,7 @@ DEFINE_STATIC_KEY_FALSE(timers_migration_enabled); =20 static void timers_update_migration(void) { - if (sysctl_timer_migration && tick_nohz_active) + if (sysctl_timer_migration && tick_nohz_is_active()) static_branch_enable(&timers_migration_enabled); else static_branch_disable(&timers_migration_enabled); --=20 2.51.1