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Subject[PATCH v2 05/14] Display /proc/stat information per cgroup
Date
Each cgroup has its own file, cpu.proc.stat that will
display the exact same format as /proc/stat. Users
that want to have access to a per-cgroup version of
this information, can query it for that purpose.

This is only meaningful when the top level file
sched_stats is set to 1. This newly introduced file
controls whether or not the statistics are collected
globally, or per-cgroup.

Signed-off-by: Glauber Costa <glommer@parallels.com>
---
arch/s390/appldata/appldata_os.c | 2 +
drivers/cpufreq/cpufreq_conservative.c | 16 ++-
drivers/cpufreq/cpufreq_ondemand.c | 16 ++-
drivers/macintosh/rack-meter.c | 2 +
fs/proc/stat.c | 2 +-
fs/proc/uptime.c | 8 +-
include/linux/kernel_stat.h | 20 ++-
include/linux/sched.h | 5 +-
kernel/sched.c | 254 ++++++++++++++++++++++++--------
9 files changed, 254 insertions(+), 71 deletions(-)
diff --git a/arch/s390/appldata/appldata_os.c b/arch/s390/appldata/appldata_os.c
index 695388a..0612a7c 100644
--- a/arch/s390/appldata/appldata_os.c
+++ b/arch/s390/appldata/appldata_os.c
@@ -114,6 +114,7 @@ static void appldata_get_os_data(void *data)

j = 0;
for_each_online_cpu(i) {
+ kstat_lock();
os_data->os_cpu[j].per_cpu_user =
cputime_to_jiffies(kcpustat_cpu(i).cpustat[USER]);
os_data->os_cpu[j].per_cpu_nice =
@@ -131,6 +132,7 @@ static void appldata_get_os_data(void *data)
os_data->os_cpu[j].per_cpu_steal =
cputime_to_jiffies(kcpustat_cpu(i).cpustat[STEAL]);
os_data->os_cpu[j].cpu_id = i;
+ kstat_unlock();
j++;
}

diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index a3a739f..ca98530 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -102,6 +102,7 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
cputime64_t cur_wall_time;
cputime64_t busy_time;

+ kstat_lock();
cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
busy_time = cputime64_add(kcpustat_cpu(cpu).cpustat[USER],
kcpustat_cpu(cpu).cpustat[SYSTEM]);
@@ -110,6 +111,7 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[SOFTIRQ]);
busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[STEAL]);
busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[NICE]);
+ kstat_unlock();

idle_time = cputime64_sub(cur_wall_time, busy_time);
if (wall)
@@ -271,8 +273,11 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
dbs_info = &per_cpu(cs_cpu_dbs_info, j);
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
+ if (dbs_tuners_ins.ignore_nice) {
+ kstat_lock();
dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
+ kstat_unlock();
+ }
}
return count;
}
@@ -365,8 +370,10 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
cputime64_t cur_nice;
unsigned long cur_nice_jiffies;

+ kstat_lock();
cur_nice = cputime64_sub(kcpustat_cpu(j).cpustat[NICE],
j_dbs_info->prev_cpu_nice);
+ kstat_unlock();
/*
* Assumption: nice time between sampling periods will
* be less than 2^32 jiffies for 32 bit sys
@@ -374,7 +381,9 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
cur_nice_jiffies = (unsigned long)
cputime64_to_jiffies64(cur_nice);

+ kstat_lock();
j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
+ kstat_unlock();
idle_time += jiffies_to_usecs(cur_nice_jiffies);
}

@@ -501,9 +510,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,

j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&j_dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
+ if (dbs_tuners_ins.ignore_nice) {
+ kstat_lock();
j_dbs_info->prev_cpu_nice =
kcpustat_cpu(j).cpustat[NICE];
+ kstat_unlock();
+ }
}
this_dbs_info->down_skip = 0;
this_dbs_info->requested_freq = policy->cur;
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 46e89663..4076453 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -126,6 +126,7 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
cputime64_t cur_wall_time;
cputime64_t busy_time;

+ kstat_lock();
cur_wall_time = jiffies64_to_cputime64(get_jiffies_64());
busy_time = cputime64_add(kcpustat_cpu(cpu).cpustat[USER],
kcpustat_cpu(cpu).cpustat[SYSTEM]);
@@ -134,6 +135,7 @@ static inline cputime64_t get_cpu_idle_time_jiffy(unsigned int cpu,
busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[SOFTIRQ]);
busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[STEAL]);
busy_time = cputime64_add(busy_time, kcpustat_cpu(cpu).cpustat[NICE]);
+ kstat_unlock();

idle_time = cputime64_sub(cur_wall_time, busy_time);
if (wall)
@@ -344,8 +346,11 @@ static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
dbs_info = &per_cpu(od_cpu_dbs_info, j);
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
+ if (dbs_tuners_ins.ignore_nice) {
+ kstat_lock();
dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
+ kstat_unlock();
+ }

}
return count;
@@ -458,8 +463,10 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
cputime64_t cur_nice;
unsigned long cur_nice_jiffies;

+ kstat_lock();
cur_nice = cputime64_sub(kcpustat_cpu(j).cpustat[NICE],
j_dbs_info->prev_cpu_nice);
+ kstat_unlock();
/*
* Assumption: nice time between sampling periods will
* be less than 2^32 jiffies for 32 bit sys
@@ -467,7 +474,9 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
cur_nice_jiffies = (unsigned long)
cputime64_to_jiffies64(cur_nice);

+ kstat_lock();
j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[NICE];
+ kstat_unlock();
idle_time += jiffies_to_usecs(cur_nice_jiffies);
}

@@ -646,9 +655,12 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,

j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&j_dbs_info->prev_cpu_wall);
- if (dbs_tuners_ins.ignore_nice)
+ if (dbs_tuners_ins.ignore_nice) {
+ kstat_lock();
j_dbs_info->prev_cpu_nice =
kcpustat_cpu(j).cpustat[NICE];
+ kstat_unlock();
+ }
}
this_dbs_info->cpu = cpu;
this_dbs_info->rate_mult = 1;
diff --git a/drivers/macintosh/rack-meter.c b/drivers/macintosh/rack-meter.c
index c8e67b0..196244f 100644
--- a/drivers/macintosh/rack-meter.c
+++ b/drivers/macintosh/rack-meter.c
@@ -83,11 +83,13 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
{
cputime64_t retval;

+ kstat_lock();
retval = cputime64_add(kcpustat_cpu(cpu).cpustat[IDLE],
kcpustat_cpu(cpu).cpustat[IOWAIT]);

if (rackmeter_ignore_nice)
retval = cputime64_add(retval, kcpustat_cpu(cpu).cpustat[NICE]);
+ kstat_unlock();

return retval;
}
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 6b10387..c9b2ae9 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -13,7 +13,7 @@

static int show_stat(struct seq_file *p, void *v)
{
- return cpu_cgroup_proc_stat(p);
+ return cpu_cgroup_proc_stat(NULL, NULL, p);
}

static int stat_open(struct inode *inode, struct file *file)
diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index b0e053d..edd62c1 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -14,8 +14,12 @@ static int uptime_proc_show(struct seq_file *m, void *v)
int i;
cputime_t idletime = cputime_zero;

- for_each_possible_cpu(i)
- idletime = cputime64_add(idletime, kstat_cpu(i).cpustat[IDLE]);
+ for_each_possible_cpu(i) {
+ kstat_lock();
+ idletime = cputime64_add(idletime, kcpustat_cpu(i).cpustat[IDLE] -
+ kcpustat_cpu(i).cpustat[IDLE_BASE]);
+ kstat_unlock();
+ }

do_posix_clock_monotonic_gettime(&uptime);
monotonic_to_bootbased(&uptime);
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index f0e31a9..9b7463f 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -27,6 +27,8 @@ enum cpu_usage_stat {
STEAL,
GUEST,
GUEST_NICE,
+ STEAL_BASE,
+ IDLE_BASE,
NR_STATS,
};

@@ -43,13 +45,25 @@ struct kernel_stat {
};

DECLARE_PER_CPU(struct kernel_stat, kstat);
-DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);

-/* Must have preemption disabled for this to be meaningful. */
#define kstat_this_cpu (&__get_cpu_var(kstat))
-#define kcpustat_this_cpu (&__get_cpu_var(kernel_cpustat))
#define kstat_cpu(cpu) per_cpu(kstat, cpu)
+
+#ifdef CONFIG_CGROUP_SCHED
+struct kernel_cpustat *task_group_kstat(struct task_struct *p);
+
+#define kcpustat_this_cpu this_cpu_ptr(task_group_kstat(current))
+#define kcpustat_cpu(cpu) (*per_cpu_ptr(task_group_kstat(current), cpu))
+#define kstat_lock() rcu_read_lock()
+#define kstat_unlock() rcu_read_unlock()
+#else
+DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
+#define kcpustat_this_cpu (&__get_cpu_var(kernel_cpustat))
#define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu)
+#define kstat_lock()
+#define kstat_unlock()
+#endif
+

extern unsigned long long nr_context_switches(void);

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8311551..16713ea 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2713,7 +2713,10 @@ static inline unsigned long rlimit_max(unsigned int limit)
return task_rlimit_max(current, limit);
}

-int cpu_cgroup_proc_stat(struct seq_file *p);
+struct cgroup;
+struct cftype;
+int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *p);
#endif /* __KERNEL__ */

#endif
diff --git a/kernel/sched.c b/kernel/sched.c
index c225e41..7ffafc0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -302,6 +302,7 @@ struct task_group {
#endif

struct cfs_bandwidth cfs_bandwidth;
+ struct kernel_cpustat __percpu *cpustat;
};

/* task_group_lock serializes the addition/removal of task groups */
@@ -741,6 +742,12 @@ static inline int cpu_of(struct rq *rq)
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
#define raw_rq() (&__raw_get_cpu_var(runqueues))

+DEFINE_PER_CPU(struct kernel_stat, kstat);
+DEFINE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
+
+EXPORT_PER_CPU_SYMBOL(kstat);
+EXPORT_PER_CPU_SYMBOL(kernel_cpustat);
+
#ifdef CONFIG_CGROUP_SCHED

/*
@@ -764,6 +771,21 @@ static inline struct task_group *task_group(struct task_struct *p)
return autogroup_task_group(p, tg);
}

+static struct jump_label_key sched_cgroup_enabled;
+static int sched_has_sched_stats = 0;
+
+struct kernel_cpustat *task_group_kstat(struct task_struct *p)
+{
+ if (static_branch(&sched_cgroup_enabled)) {
+ struct task_group *tg;
+ tg = task_group(p);
+ return tg->cpustat;
+ }
+
+ return &kernel_cpustat;
+}
+EXPORT_SYMBOL(task_group_kstat);
+
/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
{
@@ -777,7 +799,6 @@ static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
p->rt.parent = task_group(p)->rt_se[cpu];
#endif
}
-
#else /* CONFIG_CGROUP_SCHED */

static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
@@ -785,9 +806,36 @@ static inline struct task_group *task_group(struct task_struct *p)
{
return NULL;
}
-
#endif /* CONFIG_CGROUP_SCHED */

+static inline void task_group_account_field(struct task_struct *p,
+ u64 tmp, int index)
+{
+ /*
+ * Since all updates are sure to touch the root cgroup, we
+ * get ourselves ahead and touch it first. If the root cgroup
+ * is the only cgroup, then nothing else should be necessary.
+ *
+ */
+ __get_cpu_var(kernel_cpustat).cpustat[index] += tmp;
+
+#ifdef CONFIG_CGROUP_SCHED
+ if (static_branch(&sched_cgroup_enabled)) {
+ struct kernel_cpustat *kcpustat;
+ struct task_group *tg;
+
+ rcu_read_lock();
+ tg = task_group(p);
+ while (tg && (tg != &root_task_group)) {
+ kcpustat = this_cpu_ptr(tg->cpustat);
+ kcpustat->cpustat[index] += tmp;
+ tg = tg->parent;
+ }
+ rcu_read_unlock();
+ }
+#endif
+}
+
static void update_rq_clock_task(struct rq *rq, s64 delta);

static void update_rq_clock(struct rq *rq)
@@ -2159,30 +2207,36 @@ static void update_rq_clock_task(struct rq *rq, s64 delta)
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
static int irqtime_account_hi_update(void)
{
- u64 *cpustat = kcpustat_this_cpu->cpustat;
unsigned long flags;
u64 latest_ns;
+ u64 *cpustat;
int ret = 0;

local_irq_save(flags);
latest_ns = this_cpu_read(cpu_hardirq_time);
+ kstat_lock();
+ cpustat = kcpustat_this_cpu->cpustat;
if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat[IRQ]))
ret = 1;
+ kstat_unlock();
local_irq_restore(flags);
return ret;
}

static int irqtime_account_si_update(void)
{
- u64 *cpustat = kcpustat_this_cpu->cpustat;
+ u64 *cpustat;
unsigned long flags;
u64 latest_ns;
int ret = 0;

local_irq_save(flags);
latest_ns = this_cpu_read(cpu_softirq_time);
+ kstat_lock();
+ cpustat = kcpustat_this_cpu->cpustat;
if (cputime64_gt(nsecs_to_cputime64(latest_ns), cpustat[SOFTIRQ]))
ret = 1;
+ kstat_unlock();
local_irq_restore(flags);
return ret;
}
@@ -3803,12 +3857,6 @@ unlock:

#endif

-DEFINE_PER_CPU(struct kernel_stat, kstat);
-DEFINE_PER_CPU(struct kernel_cpustat, kernel_cpustat);
-
-EXPORT_PER_CPU_SYMBOL(kstat);
-EXPORT_PER_CPU_SYMBOL(kernel_cpustat);
-
/*
* Return any ns on the sched_clock that have not yet been accounted in
* @p in case that task is currently running.
@@ -3869,7 +3917,6 @@ unsigned long long task_sched_runtime(struct task_struct *p)
void account_user_time(struct task_struct *p, cputime_t cputime,
cputime_t cputime_scaled)
{
- u64 *cpustat = kcpustat_this_cpu->cpustat;
u64 tmp;

/* Add user time to process. */
@@ -3881,9 +3928,9 @@ void account_user_time(struct task_struct *p, cputime_t cputime,
tmp = cputime_to_cputime64(cputime);

if (TASK_NICE(p) > 0)
- cpustat[NICE] += tmp;
+ task_group_account_field(p, tmp, NICE);
else
- cpustat[USER] += tmp;
+ task_group_account_field(p, tmp, USER);

cpuacct_update_stats(p, CPUACCT_STAT_USER, cputime);
/* Account for user time used */
@@ -3900,7 +3947,6 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime,
cputime_t cputime_scaled)
{
u64 tmp;
- u64 *cpustat = kcpustat_this_cpu->cpustat;

tmp = cputime_to_cputime64(cputime);

@@ -3912,11 +3958,11 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime,

/* Add guest time to cpustat. */
if (TASK_NICE(p) > 0) {
- cpustat[NICE] += tmp;
- cpustat[GUEST_NICE] += tmp;
+ task_group_account_field(p, tmp, NICE);
+ task_group_account_field(p, tmp, GUEST_NICE);
} else {
- cpustat[USER] += tmp;
- cpustat[GUEST] += tmp;
+ task_group_account_field(p, tmp, USER);
+ task_group_account_field(p, tmp, GUEST);
}
}

@@ -3929,7 +3975,7 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime,
*/
static inline
void __account_system_time(struct task_struct *p, cputime_t cputime,
- cputime_t cputime_scaled, u64 *target_cputime64)
+ cputime_t cputime_scaled, int index)
{
u64 tmp = cputime_to_cputime64(cputime);

@@ -3939,7 +3985,7 @@ void __account_system_time(struct task_struct *p, cputime_t cputime,
account_group_system_time(p, cputime);

/* Add system time to cpustat. */
- *target_cputime64 += tmp;
+ task_group_account_field(p, tmp, index);
cpuacct_update_stats(p, CPUACCT_STAT_SYSTEM, cputime);

/* Account for system time used */
@@ -3956,8 +4002,7 @@ void __account_system_time(struct task_struct *p, cputime_t cputime,
void account_system_time(struct task_struct *p, int hardirq_offset,
cputime_t cputime, cputime_t cputime_scaled)
{
- u64 *cpustat = kcpustat_this_cpu->cpustat;
- u64 *target_cputime64;
+ int index;

if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
account_guest_time(p, cputime, cputime_scaled);
@@ -3965,13 +4010,13 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
}

if (hardirq_count() - hardirq_offset)
- target_cputime64 = &cpustat[IRQ];
+ index = IRQ;
else if (in_serving_softirq())
- target_cputime64 = &cpustat[SOFTIRQ];
+ index = SOFTIRQ;
else
- target_cputime64 = &cpustat[SYSTEM];
+ index = SYSTEM;

- __account_system_time(p, cputime, cputime_scaled, target_cputime64);
+ __account_system_time(p, cputime, cputime_scaled, index);
}

/*
@@ -3980,10 +4025,8 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
*/
void account_steal_time(cputime_t cputime)
{
- u64 *cpustat = kcpustat_this_cpu->cpustat;
u64 cputime64 = cputime_to_cputime64(cputime);
-
- cpustat[STEAL] += cputime64;
+ __get_cpu_var(kernel_cpustat).cpustat[STEAL] += cputime64;
}

/*
@@ -3992,14 +4035,19 @@ void account_steal_time(cputime_t cputime)
*/
void account_idle_time(cputime_t cputime)
{
- u64 *cpustat = kcpustat_this_cpu->cpustat;
+ struct kernel_cpustat *kcpustat;
u64 cputime64 = cputime_to_cputime64(cputime);
struct rq *rq = this_rq();

+ kstat_lock();
+ kcpustat = kcpustat_this_cpu;
+
if (atomic_read(&rq->nr_iowait) > 0)
- cpustat[IOWAIT] += cputime64;
+ kcpustat->cpustat[IOWAIT] += cputime64;
else
- cpustat[IDLE] += cputime64;
+ /* idle is always accounted to the root cgroup */
+ __get_cpu_var(kernel_cpustat).cpustat[IDLE] += cputime64;
+ kstat_unlock();
}

static __always_inline bool steal_account_process_tick(void)
@@ -4046,27 +4094,26 @@ static __always_inline bool steal_account_process_tick(void)
* softirq as those do not count in task exec_runtime any more.
*/
static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
- struct rq *rq)
+ struct rq *rq)
{
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
u64 tmp = cputime_to_cputime64(cputime_one_jiffy);
- u64 *cpustat = kcpustat_this_cpu->cpustat;

if (steal_account_process_tick())
return;

if (irqtime_account_hi_update()) {
- cpustat[IRQ] += tmp;
+ task_group_account_field(p, tmp, IRQ);
} else if (irqtime_account_si_update()) {
- cpustat[SOFTIRQ] += tmp;
+ task_group_account_field(p, tmp, SOFTIRQ);
} else if (this_cpu_ksoftirqd() == p) {
/*
* ksoftirqd time do not get accounted in cpu_softirq_time.
* So, we have to handle it separately here.
* Also, p->stime needs to be updated for ksoftirqd.
*/
- __account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
- &cpustat[SOFTIRQ]);
+ __account_system_time(p, cputime_one_jiffy,
+ one_jiffy_scaled, SOFTIRQ);
} else if (user_tick) {
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
} else if (p == rq->idle) {
@@ -4074,8 +4121,8 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
} else if (p->flags & PF_VCPU) { /* System time or guest time */
account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
} else {
- __account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
- &cpustat[SYSTEM]);
+ __account_system_time(p, cputime_one_jiffy,
+ one_jiffy_scaled, SYSTEM);
}
}

@@ -8240,6 +8287,8 @@ void __init sched_init(void)
INIT_LIST_HEAD(&root_task_group.children);
INIT_LIST_HEAD(&root_task_group.siblings);
autogroup_init(&init_task);
+
+ root_task_group.cpustat = &kernel_cpustat;
#endif /* CONFIG_CGROUP_SCHED */

for_each_possible_cpu(i) {
@@ -8677,6 +8726,7 @@ static void free_sched_group(struct task_group *tg)
free_fair_sched_group(tg);
free_rt_sched_group(tg);
autogroup_free(tg);
+ free_percpu(tg->cpustat);
kfree(tg);
}

@@ -8685,6 +8735,7 @@ struct task_group *sched_create_group(struct task_group *parent)
{
struct task_group *tg;
unsigned long flags;
+ int i;

tg = kzalloc(sizeof(*tg), GFP_KERNEL);
if (!tg)
@@ -8696,6 +8747,21 @@ struct task_group *sched_create_group(struct task_group *parent)
if (!alloc_rt_sched_group(tg, parent))
goto err;

+ tg->cpustat = alloc_percpu(struct kernel_cpustat);
+ if (!tg->cpustat)
+ goto err;
+
+ for_each_possible_cpu(i) {
+ struct kernel_cpustat *kcpustat, *root_kstat;
+
+ kstat_lock();
+ kcpustat = per_cpu_ptr(tg->cpustat, i);
+ root_kstat = per_cpu_ptr(root_task_group.cpustat, i);
+ kcpustat->cpustat[IDLE_BASE] = root_kstat->cpustat[IDLE];
+ kcpustat->cpustat[STEAL_BASE] = root_kstat->cpustat[STEAL];
+ kstat_unlock();
+ }
+
spin_lock_irqsave(&task_group_lock, flags);
list_add_rcu(&tg->list, &task_groups);

@@ -9440,6 +9506,23 @@ static u64 cpu_rt_period_read_uint(struct cgroup *cgrp, struct cftype *cft)
}
#endif /* CONFIG_RT_GROUP_SCHED */

+static u64 cpu_has_sched_stats(struct cgroup *cgrp, struct cftype *cft)
+{
+ return sched_has_sched_stats;
+}
+
+static int cpu_set_sched_stats(struct cgroup *cgrp, struct cftype *cft, u64 val)
+{
+ if (!val && sched_has_sched_stats)
+ jump_label_dec(&sched_cgroup_enabled);
+
+ if (val && !sched_has_sched_stats)
+ jump_label_inc(&sched_cgroup_enabled);
+
+ sched_has_sched_stats = !!val;
+ return 0;
+}
+
static struct cftype cpu_files[] = {
#ifdef CONFIG_FAIR_GROUP_SCHED
{
@@ -9476,11 +9559,33 @@ static struct cftype cpu_files[] = {
.write_u64 = cpu_rt_period_write_uint,
},
#endif
+ {
+ .name = "proc.stat",
+ .read_seq_string = cpu_cgroup_proc_stat,
+ },
+};
+
+/*
+ * Files appearing here will be shown at the top level only. Although we could
+ * show them unconditionally, and then return an error when read/writen from
+ * non-root cgroups, this is less confusing for users
+ */
+static struct cftype cpu_root_files[] = {
+ {
+ .name = "sched_stats",
+ .read_u64 = cpu_has_sched_stats,
+ .write_u64 = cpu_set_sched_stats,
+ },
};

static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
{
- return cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
+ int ret;
+ ret = cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
+ if (!ret)
+ ret = cgroup_add_files(cont, ss, cpu_root_files,
+ ARRAY_SIZE(cpu_root_files));
+ return ret;
}

struct cgroup_subsys cpu_cgroup_subsys = {
@@ -9513,7 +9618,7 @@ static u64 get_idle_time(int cpu)

if (idle_time == -1ULL) {
/* !NO_HZ so we can rely on cpustat.idle */
- idle = kcpustat_cpu(cpu).cpustat[IDLE];
+ idle = per_cpu(kernel_cpustat, cpu).cpustat[IDLE];
idle += arch_idle_time(cpu);
} else
idle = usecs_to_cputime(idle_time);
@@ -9527,14 +9632,15 @@ static u64 get_iowait_time(int cpu)

if (iowait_time == -1ULL)
/* !NO_HZ so we can rely on cpustat.iowait */
- iowait = kcpustat_cpu(cpu).cpustat[IOWAIT];
+ iowait = per_cpu(kernel_cpustat, cpu).cpustat[IOWAIT];
else
iowait = usecs_to_cputime(iowait_time);

return iowait;
}

-int cpu_cgroup_proc_stat(struct seq_file *p)
+int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *p)
{
int i, j;
unsigned long jif;
@@ -9544,6 +9650,14 @@ int cpu_cgroup_proc_stat(struct seq_file *p)
u64 sum_softirq = 0;
unsigned int per_softirq_sums[NR_SOFTIRQS] = {0};
struct timespec boottime;
+#ifdef CONFIG_CGROUP_SCHED
+ struct task_group *tg;
+
+ if (cgrp)
+ tg = cgroup_tg(cgrp);
+ else
+ tg = &root_task_group;
+#endif

user = nice = system = idle = iowait =
irq = softirq = steal = 0;
@@ -9552,16 +9666,26 @@ int cpu_cgroup_proc_stat(struct seq_file *p)
jif = boottime.tv_sec;

for_each_possible_cpu(i) {
- user += kcpustat_cpu(i).cpustat[USER];
- nice += kcpustat_cpu(i).cpustat[NICE];
- system += kcpustat_cpu(i).cpustat[SYSTEM];
+ struct kernel_cpustat *kcpustat;
+ kstat_lock();
+#ifdef CONFIG_CGROUP_SCHED
+ kcpustat = per_cpu_ptr(tg->cpustat, i);
+#else
+ kcpustat = &per_cpu(kernel_cpustat, i);
+#endif
+ user += kcpustat->cpustat[USER];
+ nice += kcpustat->cpustat[NICE];
+ system += kcpustat->cpustat[SYSTEM];
idle += get_idle_time(i);
+ idle -= kcpustat->cpustat[IDLE_BASE];
iowait += get_iowait_time(i);
- irq += kcpustat_cpu(i).cpustat[IRQ];
- softirq += kcpustat_cpu(i).cpustat[SOFTIRQ];
- steal += kcpustat_cpu(i).cpustat[STEAL];
- guest += kcpustat_cpu(i).cpustat[GUEST];
- guest_nice += kcpustat_cpu(i).cpustat[GUEST_NICE];
+ irq += kcpustat->cpustat[IRQ];
+ softirq += kcpustat->cpustat[SOFTIRQ];
+ steal += kcpustat->cpustat[STEAL];
+ steal -= kcpustat->cpustat[STEAL_BASE];
+ guest += kcpustat->cpustat[GUEST];
+ guest_nice += kcpustat->cpustat[GUEST_NICE];
+ kstat_unlock();

for (j = 0; j < NR_SOFTIRQS; j++) {
unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
@@ -9585,17 +9709,27 @@ int cpu_cgroup_proc_stat(struct seq_file *p)
(unsigned long long)cputime64_to_clock_t(guest),
(unsigned long long)cputime64_to_clock_t(guest_nice));
for_each_online_cpu(i) {
+ struct kernel_cpustat *kcpustat;
+ kstat_lock();
+#ifdef CONFIG_CGROUP_SCHED
+ kcpustat = per_cpu_ptr(tg->cpustat, i);
+#else
+ kcpustat = &per_cpu(kernel_cpustat, i);
+#endif
/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
- user = kcpustat_cpu(i).cpustat[USER];
- nice = kcpustat_cpu(i).cpustat[NICE];
- system = kcpustat_cpu(i).cpustat[SYSTEM];
+ user = kcpustat->cpustat[USER];
+ nice = kcpustat->cpustat[NICE];
+ system = kcpustat->cpustat[SYSTEM];
idle = get_idle_time(i);
+ idle -= kcpustat->cpustat[IDLE_BASE];
iowait = get_iowait_time(i);
- irq = kcpustat_cpu(i).cpustat[IRQ];
- softirq = kcpustat_cpu(i).cpustat[SOFTIRQ];
- steal = kcpustat_cpu(i).cpustat[STEAL];
- guest = kcpustat_cpu(i).cpustat[GUEST];
- guest_nice = kcpustat_cpu(i).cpustat[GUEST_NICE];
+ irq = kcpustat->cpustat[IRQ];
+ softirq = kcpustat->cpustat[SOFTIRQ];
+ steal = kcpustat->cpustat[STEAL];
+ steal -= kcpustat->cpustat[STEAL_BASE];
+ guest = kcpustat->cpustat[GUEST];
+ guest_nice = kcpustat->cpustat[GUEST_NICE];
+ kstat_unlock();
seq_printf(p,
"cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu "
"%llu\n",
--
1.7.6.4


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