From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM list <linux-pm@vger.kernel.org>
Cc: Juri Lelli <juri.lelli@arm.com>,
Steve Muckle <steve.muckle@linaro.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Michael Turquette <mturquette@baylibre.com>,
Ingo Molnar <mingo@kernel.org>
Subject: [PATCH v3 2/7][Resend] cpufreq: Move scheduler-related code to the sched directory
Date: Tue, 08 Mar 2016 03:26:16 +0100 [thread overview]
Message-ID: <1558261.iWFRT0Bv7l@vostro.rjw.lan> (raw)
In-Reply-To: <4088601.C2vItRYpQn@vostro.rjw.lan>
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Create cpufreq.c under kernel/sched/ and move the cpufreq code
related to the scheduler to that file. Also move the headers
related to that code from cpufreq.h to sched.h.
No functional changes.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
No changes from v2.
---
drivers/cpufreq/cpufreq.c | 61 ------------------------------
drivers/cpufreq/cpufreq_governor.c | 1
drivers/cpufreq/intel_pstate.c | 1
include/linux/cpufreq.h | 10 -----
include/linux/sched.h | 12 ++++++
kernel/sched/Makefile | 1
kernel/sched/cpufreq.c | 73 +++++++++++++++++++++++++++++++++++++
7 files changed, 88 insertions(+), 71 deletions(-)
Index: linux-pm/drivers/cpufreq/cpufreq.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/cpufreq.c
+++ linux-pm/drivers/cpufreq/cpufreq.c
@@ -65,67 +65,6 @@ static struct cpufreq_driver *cpufreq_dr
static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
static DEFINE_RWLOCK(cpufreq_driver_lock);
-static DEFINE_PER_CPU(struct freq_update_hook *, cpufreq_freq_update_hook);
-
-/**
- * cpufreq_set_freq_update_hook - Populate the CPU's freq_update_hook pointer.
- * @cpu: The CPU to set the pointer for.
- * @hook: New pointer value.
- *
- * Set and publish the freq_update_hook pointer for the given CPU. That pointer
- * points to a struct freq_update_hook object containing a callback function
- * to call from cpufreq_trigger_update(). That function will be called from
- * an RCU read-side critical section, so it must not sleep.
- *
- * Callers must use RCU-sched callbacks to free any memory that might be
- * accessed via the old update_util_data pointer or invoke synchronize_sched()
- * right after this function to avoid use-after-free.
- */
-void cpufreq_set_freq_update_hook(int cpu, struct freq_update_hook *hook)
-{
- if (WARN_ON(hook && !hook->func))
- return;
-
- rcu_assign_pointer(per_cpu(cpufreq_freq_update_hook, cpu), hook);
-}
-EXPORT_SYMBOL_GPL(cpufreq_set_freq_update_hook);
-
-/**
- * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed.
- * @time: Current time.
- *
- * The way cpufreq is currently arranged requires it to evaluate the CPU
- * performance state (frequency/voltage) on a regular basis. To facilitate
- * that, this function is called by update_load_avg() in CFS when executed for
- * the current CPU's runqueue.
- *
- * However, this isn't sufficient to prevent the CPU from being stuck in a
- * completely inadequate performance level for too long, because the calls
- * from CFS will not be made if RT or deadline tasks are active all the time
- * (or there are RT and DL tasks only).
- *
- * As a workaround for that issue, this function is called by the RT and DL
- * sched classes to trigger extra cpufreq updates to prevent it from stalling,
- * but that really is a band-aid. Going forward it should be replaced with
- * solutions targeted more specifically at RT and DL tasks.
- */
-void cpufreq_trigger_update(u64 time)
-{
- struct freq_update_hook *hook;
-
-#ifdef CONFIG_LOCKDEP
- WARN_ON(debug_locks && !rcu_read_lock_sched_held());
-#endif
-
- hook = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_freq_update_hook));
- /*
- * If this isn't inside of an RCU-sched read-side critical section, data
- * may become NULL after the check below.
- */
- if (hook)
- hook->func(hook, time);
-}
-
/* Flag to suspend/resume CPUFreq governors */
static bool cpufreq_suspended;
Index: linux-pm/drivers/cpufreq/cpufreq_governor.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/cpufreq_governor.c
+++ linux-pm/drivers/cpufreq/cpufreq_governor.c
@@ -18,6 +18,7 @@
#include <linux/export.h>
#include <linux/kernel_stat.h>
+#include <linux/sched.h>
#include <linux/slab.h>
#include "cpufreq_governor.h"
Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -21,6 +21,7 @@
#include <linux/list.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
+#include <linux/sched.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/fs.h>
Index: linux-pm/include/linux/cpufreq.h
===================================================================
--- linux-pm.orig/include/linux/cpufreq.h
+++ linux-pm/include/linux/cpufreq.h
@@ -146,14 +146,6 @@ static inline bool policy_is_shared(stru
extern struct kobject *cpufreq_global_kobject;
#ifdef CONFIG_CPU_FREQ
-void cpufreq_trigger_update(u64 time);
-
-struct freq_update_hook {
- void (*func)(struct freq_update_hook *hook, u64 time);
-};
-
-void cpufreq_set_freq_update_hook(int cpu, struct freq_update_hook *hook);
-
unsigned int cpufreq_get(unsigned int cpu);
unsigned int cpufreq_quick_get(unsigned int cpu);
unsigned int cpufreq_quick_get_max(unsigned int cpu);
@@ -165,8 +157,6 @@ int cpufreq_update_policy(unsigned int c
bool have_governor_per_policy(void);
struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
#else
-static inline void cpufreq_trigger_update(u64 time) {}
-
static inline unsigned int cpufreq_get(unsigned int cpu)
{
return 0;
Index: linux-pm/include/linux/sched.h
===================================================================
--- linux-pm.orig/include/linux/sched.h
+++ linux-pm/include/linux/sched.h
@@ -2362,6 +2362,18 @@ extern u64 scheduler_tick_max_deferment(
static inline bool sched_can_stop_tick(void) { return false; }
#endif
+#ifdef CONFIG_CPU_FREQ
+void cpufreq_trigger_update(u64 time);
+
+struct freq_update_hook {
+ void (*func)(struct freq_update_hook *hook, u64 time);
+};
+
+void cpufreq_set_freq_update_hook(int cpu, struct freq_update_hook *hook);
+#else
+static inline void cpufreq_trigger_update(u64 time) {}
+#endif
+
#ifdef CONFIG_SCHED_AUTOGROUP
extern void sched_autogroup_create_attach(struct task_struct *p);
extern void sched_autogroup_detach(struct task_struct *p);
Index: linux-pm/kernel/sched/Makefile
===================================================================
--- linux-pm.orig/kernel/sched/Makefile
+++ linux-pm/kernel/sched/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_SCHED_AUTOGROUP) += auto_gr
obj-$(CONFIG_SCHEDSTATS) += stats.o
obj-$(CONFIG_SCHED_DEBUG) += debug.o
obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
+obj-$(CONFIG_CPU_FREQ) += cpufreq.o
Index: linux-pm/kernel/sched/cpufreq.c
===================================================================
--- /dev/null
+++ linux-pm/kernel/sched/cpufreq.c
@@ -0,0 +1,73 @@
+/*
+ * Scheduler code and data structures related to cpufreq.
+ *
+ * Copyright (C) 2016, Intel Corporation
+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/sched.h>
+
+static DEFINE_PER_CPU(struct freq_update_hook *, cpufreq_freq_update_hook);
+
+/**
+ * cpufreq_set_freq_update_hook - Populate the CPU's freq_update_hook pointer.
+ * @cpu: The CPU to set the pointer for.
+ * @hook: New pointer value.
+ *
+ * Set and publish the freq_update_hook pointer for the given CPU. That pointer
+ * points to a struct freq_update_hook object containing a callback function
+ * to call from cpufreq_trigger_update(). That function will be called from
+ * an RCU read-side critical section, so it must not sleep.
+ *
+ * Callers must use RCU-sched callbacks to free any memory that might be
+ * accessed via the old update_util_data pointer or invoke synchronize_sched()
+ * right after this function to avoid use-after-free.
+ */
+void cpufreq_set_freq_update_hook(int cpu, struct freq_update_hook *hook)
+{
+ if (WARN_ON(hook && !hook->func))
+ return;
+
+ rcu_assign_pointer(per_cpu(cpufreq_freq_update_hook, cpu), hook);
+}
+EXPORT_SYMBOL_GPL(cpufreq_set_freq_update_hook);
+
+/**
+ * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed.
+ * @time: Current time.
+ *
+ * The way cpufreq is currently arranged requires it to evaluate the CPU
+ * performance state (frequency/voltage) on a regular basis. To facilitate
+ * that, this function is called by update_load_avg() in CFS when executed for
+ * the current CPU's runqueue.
+ *
+ * However, this isn't sufficient to prevent the CPU from being stuck in a
+ * completely inadequate performance level for too long, because the calls
+ * from CFS will not be made if RT or deadline tasks are active all the time
+ * (or there are RT and DL tasks only).
+ *
+ * As a workaround for that issue, this function is called by the RT and DL
+ * sched classes to trigger extra cpufreq updates to prevent it from stalling,
+ * but that really is a band-aid. Going forward it should be replaced with
+ * solutions targeted more specifically at RT and DL tasks.
+ */
+void cpufreq_trigger_update(u64 time)
+{
+ struct freq_update_hook *hook;
+
+#ifdef CONFIG_LOCKDEP
+ WARN_ON(debug_locks && !rcu_read_lock_sched_held());
+#endif
+
+ hook = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_freq_update_hook));
+ /*
+ * If this isn't inside of an RCU-sched read-side critical section, hook
+ * may become NULL after the check below.
+ */
+ if (hook)
+ hook->func(hook, time);
+}
next prev parent reply other threads:[~2016-03-08 2:53 UTC|newest]
Thread overview: 158+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-02 1:56 [PATCH 0/6] cpufreq: schedutil governor Rafael J. Wysocki
2016-03-02 2:04 ` [PATCH 1/6] cpufreq: Reduce cpufreq_update_util() overhead a bit Rafael J. Wysocki
2016-03-03 5:48 ` Viresh Kumar
2016-03-03 11:47 ` Juri Lelli
2016-03-03 13:04 ` Peter Zijlstra
2016-03-02 2:05 ` [PATCH 2/6][Resend] cpufreq: acpi-cpufreq: Make read and write operations more efficient Rafael J. Wysocki
2016-03-02 2:08 ` [PATCH 3/6] cpufreq: governor: New data type for management part of dbs_data Rafael J. Wysocki
2016-03-03 5:53 ` Viresh Kumar
2016-03-03 19:26 ` Rafael J. Wysocki
2016-03-04 5:49 ` Viresh Kumar
2016-03-02 2:10 ` [PATCH 4/6] cpufreq: governor: Move abstract gov_tunables code to a seperate file Rafael J. Wysocki
2016-03-03 6:03 ` Viresh Kumar
2016-03-02 2:12 ` [PATCH 5/6] cpufreq: Support for fast frequency switching Rafael J. Wysocki
2016-03-03 6:00 ` Viresh Kumar
2016-03-04 2:15 ` Rafael J. Wysocki
2016-03-03 11:16 ` Peter Zijlstra
2016-03-03 20:56 ` Rafael J. Wysocki
2016-03-03 21:12 ` Peter Zijlstra
2016-03-03 11:18 ` Peter Zijlstra
2016-03-03 19:39 ` Rafael J. Wysocki
2016-03-02 2:27 ` [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler utilization data Rafael J. Wysocki
2016-03-02 17:10 ` Vincent Guittot
2016-03-02 17:58 ` Rafael J. Wysocki
2016-03-02 22:49 ` Rafael J. Wysocki
2016-03-03 12:20 ` Peter Zijlstra
2016-03-03 12:32 ` Juri Lelli
2016-03-03 16:24 ` Rafael J. Wysocki
2016-03-03 16:37 ` Peter Zijlstra
2016-03-03 16:47 ` Peter Zijlstra
2016-03-04 1:14 ` Rafael J. Wysocki
2016-03-03 16:55 ` Juri Lelli
2016-03-03 16:56 ` Peter Zijlstra
2016-03-03 17:14 ` Juri Lelli
2016-03-03 14:01 ` Vincent Guittot
2016-03-03 15:38 ` Peter Zijlstra
2016-03-03 16:28 ` Peter Zijlstra
2016-03-03 16:42 ` Peter Zijlstra
2016-03-03 17:28 ` Dietmar Eggemann
2016-03-03 18:26 ` Peter Zijlstra
2016-03-03 19:14 ` Dietmar Eggemann
2016-03-08 13:09 ` Peter Zijlstra
2016-03-03 18:58 ` Rafael J. Wysocki
2016-03-03 13:07 ` Vincent Guittot
2016-03-03 20:06 ` Steve Muckle
2016-03-03 20:20 ` Rafael J. Wysocki
2016-03-03 21:37 ` Steve Muckle
2016-03-07 2:41 ` Rafael J. Wysocki
2016-03-08 11:27 ` Peter Zijlstra
2016-03-08 18:00 ` Rafael J. Wysocki
2016-03-08 19:26 ` Peter Zijlstra
2016-03-08 20:05 ` Rafael J. Wysocki
2016-03-09 10:15 ` Juri Lelli
2016-03-09 23:41 ` Rafael J. Wysocki
2016-03-10 4:30 ` Juri Lelli
2016-03-10 21:01 ` Rafael J. Wysocki
2016-03-10 23:19 ` Michael Turquette
2016-03-09 16:39 ` Peter Zijlstra
2016-03-09 23:28 ` Rafael J. Wysocki
2016-03-10 3:44 ` Vincent Guittot
2016-03-10 10:07 ` Peter Zijlstra
2016-03-10 10:26 ` Vincent Guittot
[not found] ` <CAKfTPtCbjgbJn+68NJPCnmPFtcHD0wGmZRYaw37zSqPXNpo_Uw@mail.gmail.com>
2016-03-10 10:30 ` Peter Zijlstra
2016-03-10 10:56 ` Peter Zijlstra
2016-03-10 22:28 ` Rafael J. Wysocki
2016-03-10 8:43 ` Peter Zijlstra
2016-03-04 2:56 ` [PATCH v2 0/10] cpufreq: schedutil governor Rafael J. Wysocki
2016-03-04 2:58 ` [PATCH v2 1/10] cpufreq: Reduce cpufreq_update_util() overhead a bit Rafael J. Wysocki
2016-03-09 12:39 ` Peter Zijlstra
2016-03-09 14:17 ` Rafael J. Wysocki
2016-03-09 15:29 ` Peter Zijlstra
2016-03-09 21:35 ` Rafael J. Wysocki
2016-03-10 9:19 ` Peter Zijlstra
2016-03-04 2:59 ` [PATCH v2 2/10][Resend] cpufreq: acpi-cpufreq: Make read and write operations more efficient Rafael J. Wysocki
2016-03-04 3:01 ` [PATCH v2 3/10] cpufreq: governor: New data type for management part of dbs_data Rafael J. Wysocki
2016-03-04 5:52 ` Viresh Kumar
2016-03-04 3:03 ` [PATCH v2 4/10] cpufreq: governor: Move abstract gov_attr_set code to seperate file Rafael J. Wysocki
2016-03-04 5:52 ` Viresh Kumar
2016-03-04 3:05 ` [PATCH v2 5/10] cpufreq: Move governor attribute set headers to cpufreq.h Rafael J. Wysocki
2016-03-04 5:53 ` Viresh Kumar
2016-03-04 3:07 ` [PATCH v2 6/10] cpufreq: Support for fast frequency switching Rafael J. Wysocki
2016-03-04 22:18 ` Steve Muckle
2016-03-04 22:32 ` Rafael J. Wysocki
2016-03-04 22:40 ` Rafael J. Wysocki
2016-03-04 23:18 ` Rafael J. Wysocki
2016-03-04 23:56 ` Steve Muckle
2016-03-05 0:18 ` Rafael J. Wysocki
2016-03-05 11:58 ` Ingo Molnar
2016-03-05 16:49 ` Peter Zijlstra
2016-03-06 2:17 ` Rafael J. Wysocki
2016-03-07 8:00 ` Peter Zijlstra
2016-03-07 13:15 ` Rafael J. Wysocki
2016-03-07 13:32 ` Peter Zijlstra
2016-03-07 13:42 ` Rafael J. Wysocki
2016-03-04 22:58 ` Rafael J. Wysocki
2016-03-04 23:59 ` Steve Muckle
2016-03-04 3:12 ` [PATCH v2 7/10] cpufreq: Rework the scheduler hooks for triggering updates Rafael J. Wysocki
2016-03-04 3:14 ` [PATCH v2 8/10] cpufreq: Move scheduler-related code to the sched directory Rafael J. Wysocki
2016-03-04 3:18 ` [PATCH v2 9/10] cpufreq: sched: Re-introduce cpufreq_update_util() Rafael J. Wysocki
2016-03-04 10:50 ` Juri Lelli
2016-03-04 12:58 ` Rafael J. Wysocki
2016-03-04 13:30 ` [PATCH v3 " Rafael J. Wysocki
2016-03-04 21:21 ` Steve Muckle
2016-03-04 21:27 ` Rafael J. Wysocki
2016-03-04 21:36 ` Rafael J. Wysocki
2016-03-04 3:35 ` [PATCH v2 10/10] cpufreq: schedutil: New governor based on scheduler utilization data Rafael J. Wysocki
2016-03-04 11:26 ` Juri Lelli
2016-03-04 13:19 ` Rafael J. Wysocki
2016-03-04 15:56 ` Srinivas Pandruvada
2016-03-08 2:23 ` [PATCH v3 0/7] cpufreq: schedutil governor Rafael J. Wysocki
2016-03-08 2:25 ` [PATCH v3 1/7][Resend] cpufreq: Rework the scheduler hooks for triggering updates Rafael J. Wysocki
2016-03-09 13:41 ` Peter Zijlstra
2016-03-09 14:02 ` Rafael J. Wysocki
2016-03-08 2:26 ` Rafael J. Wysocki [this message]
2016-03-08 2:28 ` [PATCH v3 3/7][Resend] cpufreq: governor: New data type for management part of dbs_data Rafael J. Wysocki
2016-03-08 2:29 ` [PATCH v3 4/7][Resend] cpufreq: governor: Move abstract gov_attr_set code to seperate file Rafael J. Wysocki
2016-03-08 2:38 ` [PATCH v3 5/7] cpufreq: Support for fast frequency switching Rafael J. Wysocki
2016-03-08 2:41 ` [PATCH v3 6/7] cpufreq: sched: Re-introduce cpufreq_update_util() Rafael J. Wysocki
2016-03-08 2:50 ` [PATCH v3 7/7] cpufreq: schedutil: New governor based on scheduler utilization data Rafael J. Wysocki
2016-03-16 14:41 ` [PATCH v4 0/7] cpufreq: schedutil governor Rafael J. Wysocki
2016-03-16 14:43 ` [PATCH v4 1/7] cpufreq: sched: Helpers to add and remove update_util hooks Rafael J. Wysocki
2016-03-16 14:44 ` [PATCH v4 2/7] cpufreq: governor: New data type for management part of dbs_data Rafael J. Wysocki
2016-03-16 14:45 ` [PATCH v4 3/7] cpufreq: governor: Move abstract gov_attr_set code to seperate file Rafael J. Wysocki
2016-03-16 14:46 ` [PATCH v4 4/7] cpufreq: Move governor attribute set headers to cpufreq.h Rafael J. Wysocki
2016-03-16 14:47 ` [PATCH v4 5/7] cpufreq: Move governor symbols " Rafael J. Wysocki
2016-03-16 14:52 ` [PATCH v4 6/7] cpufreq: Support for fast frequency switching Rafael J. Wysocki
2016-03-16 15:35 ` Peter Zijlstra
2016-03-16 16:58 ` Rafael J. Wysocki
2016-03-16 15:43 ` Peter Zijlstra
2016-03-16 16:58 ` Rafael J. Wysocki
2016-03-16 14:59 ` [PATCH v4 7/7] cpufreq: schedutil: New governor based on scheduler utilization data Rafael J. Wysocki
2016-03-16 17:35 ` Peter Zijlstra
2016-03-16 21:42 ` Rafael J. Wysocki
2016-03-16 17:36 ` Peter Zijlstra
2016-03-16 21:34 ` Rafael J. Wysocki
2016-03-16 17:52 ` Peter Zijlstra
2016-03-16 21:38 ` Rafael J. Wysocki
2016-03-16 22:39 ` Peter Zijlstra
2016-03-16 17:53 ` Peter Zijlstra
2016-03-16 21:48 ` Rafael J. Wysocki
2016-03-16 18:14 ` Peter Zijlstra
2016-03-16 21:38 ` Rafael J. Wysocki
2016-03-16 22:40 ` Peter Zijlstra
2016-03-16 22:53 ` Rafael J. Wysocki
2016-03-16 15:27 ` [PATCH v4 0/7] cpufreq: schedutil governor Peter Zijlstra
2016-03-16 16:20 ` Rafael J. Wysocki
2016-03-16 23:51 ` [PATCH v5 6/7][Update] cpufreq: Support for fast frequency switching Rafael J. Wysocki
2016-03-17 11:35 ` Juri Lelli
2016-03-17 11:40 ` Peter Zijlstra
2016-03-17 11:48 ` Juri Lelli
2016-03-17 12:53 ` Rafael J. Wysocki
2016-03-17 0:01 ` [PATCH v5 7/7][Update] cpufreq: schedutil: New governor based on scheduler utilization data Rafael J. Wysocki
2016-03-17 11:30 ` Juri Lelli
2016-03-17 12:54 ` Rafael J. Wysocki
2016-03-17 11:36 ` Peter Zijlstra
2016-03-17 12:54 ` Rafael J. Wysocki
2016-03-17 15:54 ` [PATCH v6 6/7][Update] cpufreq: Support for fast frequency switching Rafael J. Wysocki
2016-03-17 16:01 ` [PATCH v6 7/7][Update] cpufreq: schedutil: New governor based on scheduler utilization data Rafael J. Wysocki
2016-03-18 12:34 ` Patrick Bellasi
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