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Date: Thu, 14 May 2015 17:12:50 -0700
From: Ruchi Kandoi <kandoiruchi@...gle.com>
To: kandoiruchi@...gle.com, "Rafael J. Wysocki" <rjw@...ysocki.net>,
Viresh Kumar <viresh.kumar@...aro.org>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Vladimir Davydov <vdavydov@...allels.com>,
Heinrich Schuchardt <xypron.glpk@....de>,
Thomas Gleixner <tglx@...utronix.de>,
Kees Cook <keescook@...omium.org>,
Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
Davidlohr Bueso <dave@...olabs.net>, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] sched: cpufreq: Adds a field cpu_power in the task_struct
cpu_power has been added to keep track of amount of power each task is
consuming. cpu_power is updated whenever stime and utime are updated for
a task. power is computed by taking into account the frequency at which
the current core was running and the current for cpu actively
running at hat frequency.
Signed-off-by: Ruchi Kandoi <kandoiruchi@...gle.com>
---
drivers/cpufreq/cpufreq_stats.c | 28 ++++++++++++++++++++++++++++
include/linux/cpufreq.h | 8 ++++++++
include/linux/sched.h | 2 ++
kernel/fork.c | 1 +
kernel/sched/cputime.c | 7 +++++++
5 files changed, 46 insertions(+)
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 6f0b562..682ed898 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/cputime.h>
+#include <linux/sched.h>
static spinlock_t cpufreq_stats_lock;
@@ -83,6 +84,33 @@ static void store_current_value(struct cpufreq_power_stats *powerstats,
}
}
+void acct_update_power(struct task_struct *task, cputime_t cputime)
+{
+ struct cpufreq_power_stats *powerstats;
+ struct cpufreq_stats *stats;
+ struct cpufreq_policy *policy;
+ unsigned int cpu_num, curr;
+
+ if (!task)
+ return;
+ cpu_num = task_cpu(task);
+ powerstats = per_cpu(cpufreq_power_stats, cpu_num);
+ policy = cpufreq_cpu_get(cpu_num);
+ if (!policy)
+ return;
+
+ if (!powerstats || !(policy->stats)) {
+ cpufreq_cpu_put(policy);
+ return;
+ }
+
+ stats = policy->stats;
+ curr = powerstats->curr[stats->last_index];
+ task->cpu_power += curr * cputime_to_usecs(cputime);
+ cpufreq_cpu_put(policy);
+}
+EXPORT_SYMBOL_GPL(acct_update_power);
+
static ssize_t store_current_in_state(struct cpufreq_policy *policy,
const char *buf, size_t len)
{
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 2ee4888..86826c8 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -18,6 +18,7 @@
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
+#include <asm/cputime.h>
/*********************************************************************
* CPUFREQ INTERFACE *
@@ -601,4 +602,11 @@ unsigned int cpufreq_generic_get(unsigned int cpu);
int cpufreq_generic_init(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table,
unsigned int transition_latency);
+
+/*********************************************************************
+ * CPUFREQ STATS *
+ *********************************************************************/
+
+void acct_update_power(struct task_struct *p, cputime_t cputime);
+
#endif /* _LINUX_CPUFREQ_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 26a2e61..1f2400a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1429,6 +1429,7 @@ struct task_struct {
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
cputime_t utime, stime, utimescaled, stimescaled;
+ unsigned long long cpu_power;
cputime_t gtime;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
struct cputime prev_cputime;
@@ -1441,6 +1442,7 @@ struct task_struct {
VTIME_USER,
VTIME_SYS,
} vtime_snap_whence;
+
#endif
unsigned long nvcsw, nivcsw; /* context switch counts */
u64 start_time; /* monotonic time in nsec */
diff --git a/kernel/fork.c b/kernel/fork.c
index 03c1eaa..2ca0e9e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1341,6 +1341,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->utime = p->stime = p->gtime = 0;
p->utimescaled = p->stimescaled = 0;
+ p->cpu_power = 0;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
p->prev_cputime.utime = p->prev_cputime.stime = 0;
#endif
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 8394b1e..53a79d5 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -4,6 +4,7 @@
#include <linux/kernel_stat.h>
#include <linux/static_key.h>
#include <linux/context_tracking.h>
+#include <linux/cpufreq.h>
#include "sched.h"
@@ -149,6 +150,9 @@ void account_user_time(struct task_struct *p, cputime_t cputime,
/* Account for user time used */
acct_account_cputime(p);
+
+ /* Account power usage for user time */
+ acct_update_power(p, cputime);
}
/*
@@ -199,6 +203,9 @@ void __account_system_time(struct task_struct *p, cputime_t cputime,
/* Account for system time used */
acct_account_cputime(p);
+
+ /* Account power usage for system time */
+ acct_update_power(p, cputime);
}
/*
--
2.2.0.rc0.207.ga3a616c
--
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