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sched: cpufreq: Adds a field cpu_power in the task_struct

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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.

Bug: 21498425
Change-Id: Ic535941e7b339aab5cae9081a34049daeb44b248
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
Git-commit: 94877641f6b6ea17aa335729f548eb5647db3e3e
Git-repo: https://android.googlesource.com/kernel/msm/
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>
[clingutla@codeaurora.org:This fixes the undefined reference
 to acct_update_power() when building for ARCH=um in
 include/linux/cpufreq.h]
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>
This commit is contained in:
Ruchi Kandoi 2015-04-17 16:33:29 -07:00 committed by Avaneesh Kumar Dwivedi
parent ae586dc9cb
commit 9d329d4cf1
5 changed files with 39 additions and 0 deletions
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20
drivers/cpufreq/cpufreq_stats.c
View file

@ -16,6 +16,7 @@
#include <linux/sort.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/sched.h>
#include <asm/cputime.h>
static spinlock_t cpufreq_stats_lock;
@ -126,6 +127,25 @@ static int get_index_all_cpufreq_stat(struct all_cpufreq_stats *all_stat,
return -1;
}
void acct_update_power(struct task_struct *task, cputime_t cputime)
{
struct cpufreq_power_stats *powerstats;
struct cpufreq_stats *stats;
unsigned int cpu_num, curr;
if (!task)
return;
cpu_num = task_cpu(task);
powerstats = per_cpu(cpufreq_power_stats, cpu_num);
stats = per_cpu(cpufreq_stats_table, cpu_num);
if (!powerstats || !stats)
return;
curr = powerstats->curr[stats->last_index];
task->cpu_power += curr * cputime_to_usecs(cputime);
}
EXPORT_SYMBOL_GPL(acct_update_power);
static ssize_t show_current_in_state(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{

10
include/linux/cpufreq.h
View file

@ -16,6 +16,7 @@
#include <linux/kobject.h>
#include <linux/notifier.h>
#include <linux/sysfs.h>
#include <asm/cputime.h>
/*********************************************************************
* CPUFREQ INTERFACE *
@ -483,4 +484,13 @@ static inline int cpufreq_generic_exit(struct cpufreq_policy *policy)
return 0;
}
/*********************************************************************
* CPUFREQ STATS *
*********************************************************************/
#ifdef CONFIG_CPU_FREQ_STAT
void acct_update_power(struct task_struct *p, cputime_t cputime);
#else
static inline void acct_update_power(struct task_struct *p, cputime_t cputime) {}
#endif
#endif /* _LINUX_CPUFREQ_H */

1
include/linux/sched.h
View file

@ -1343,6 +1343,7 @@ struct task_struct {
cputime_t utime, stime, utimescaled, stimescaled;
cputime_t gtime;
unsigned long long cpu_power;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
struct cputime prev_cputime;
#endif

1
kernel/fork.c
View file

@ -1300,6 +1300,7 @@ 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

7
kernel/sched/cputime.c
View file

@ -1,3 +1,4 @@
#include <linux/cpufreq.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/tsacct_kern.h>
@ -158,6 +159,9 @@ 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);
}
/*
@ -208,6 +212,9 @@ 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);
}
/*