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sched/cpuacct: Split usage accounting into user_usage and sys_usage 

Sometimes, cpuacct.usage is not detailed enough to see how much CPU
usage a group had. We want to know how much time it used in user mode
and how much in kernel mode.

This patch introduces more files to give this information:

 # ls /sys/fs/cgroup/cpuacct/cpuacct.usage*
 /sys/fs/cgroup/cpuacct/cpuacct.usage
 /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu
 /sys/fs/cgroup/cpuacct/cpuacct.usage_user
 /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu_user
 /sys/fs/cgroup/cpuacct/cpuacct.usage_sys
 /sys/fs/cgroup/cpuacct/cpuacct.usage_percpu_sys

... while keeping the ABI with the existing counter.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
[ Ported to newer kernels. ]
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/aa171da036b520b51c79549e9b3215d29473f19d.1458635566.git.zhaolei@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dongsheng Yang 2016-03-22 16:37:08 +08:00 committed by Ingo Molnar
parent 5ca3726af7
commit d740037fac
1 changed files with 113 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

140
kernel/sched/cpuacct.c
View File

@ -25,11 +25,22 @@ enum cpuacct_stat_index {
CPUACCT_STAT_NSTATS,
};
enum cpuacct_usage_index {
CPUACCT_USAGE_USER, /* ... user mode */
CPUACCT_USAGE_SYSTEM, /* ... kernel mode */
CPUACCT_USAGE_NRUSAGE,
};
struct cpuacct_usage {
u64 usages[CPUACCT_USAGE_NRUSAGE];
};
/* track cpu usage of a group of tasks and its child groups */
struct cpuacct {
struct cgroup_subsys_state css;
/* cpuusage holds pointer to a u64-type object on every cpu */
u64 __percpu *cpuusage;
struct cpuacct_usage __percpu *cpuusage;
struct kernel_cpustat __percpu *cpustat;
};
@ -49,7 +60,7 @@ static inline struct cpuacct *parent_ca(struct cpuacct *ca)
return css_ca(ca->css.parent);
}
static DEFINE_PER_CPU(u64, root_cpuacct_cpuusage);
static DEFINE_PER_CPU(struct cpuacct_usage, root_cpuacct_cpuusage);
static struct cpuacct root_cpuacct = {
.cpustat = &kernel_cpustat,
.cpuusage = &root_cpuacct_cpuusage,
@ -68,7 +79,7 @@ cpuacct_css_alloc(struct cgroup_subsys_state *parent_css)
if (!ca)
goto out;
ca->cpuusage = alloc_percpu(u64);
ca->cpuusage = alloc_percpu(struct cpuacct_usage);
if (!ca->cpuusage)
goto out_free_ca;
@ -96,20 +107,37 @@ static void cpuacct_css_free(struct cgroup_subsys_state *css)
kfree(ca);
}
static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu,
enum cpuacct_usage_index index)
{
u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
u64 data;
/*
* We allow index == CPUACCT_USAGE_NRUSAGE here to read
* the sum of suages.
*/
BUG_ON(index > CPUACCT_USAGE_NRUSAGE);
#ifndef CONFIG_64BIT
/*
* Take rq->lock to make 64-bit read safe on 32-bit platforms.
*/
raw_spin_lock_irq(&cpu_rq(cpu)->lock);
data = *cpuusage;
#endif
if (index == CPUACCT_USAGE_NRUSAGE) {
int i = 0;
data = 0;
for (i = 0; i < CPUACCT_USAGE_NRUSAGE; i++)
data += cpuusage->usages[i];
} else {
data = cpuusage->usages[index];
}
#ifndef CONFIG_64BIT
raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
#else
data = *cpuusage;
#endif
return data;
@ -117,69 +145,103 @@ static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
{
u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
int i;
#ifndef CONFIG_64BIT
/*
* Take rq->lock to make 64-bit write safe on 32-bit platforms.
*/
raw_spin_lock_irq(&cpu_rq(cpu)->lock);
*cpuusage = val;
#endif
for (i = 0; i < CPUACCT_USAGE_NRUSAGE; i++)
cpuusage->usages[i] = val;
#ifndef CONFIG_64BIT
raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
#else
*cpuusage = val;
#endif
}
/* return total cpu usage (in nanoseconds) of a group */
static u64 cpuusage_read(struct cgroup_subsys_state *css, struct cftype *cft)
static u64 __cpuusage_read(struct cgroup_subsys_state *css,
enum cpuacct_usage_index index)
{
struct cpuacct *ca = css_ca(css);
u64 totalcpuusage = 0;
int i;
for_each_possible_cpu(i)
totalcpuusage += cpuacct_cpuusage_read(ca, i);
totalcpuusage += cpuacct_cpuusage_read(ca, i, index);
return totalcpuusage;
}
static u64 cpuusage_user_read(struct cgroup_subsys_state *css,
struct cftype *cft)
{
return __cpuusage_read(css, CPUACCT_USAGE_USER);
}
static u64 cpuusage_sys_read(struct cgroup_subsys_state *css,
struct cftype *cft)
{
return __cpuusage_read(css, CPUACCT_USAGE_SYSTEM);
}
static u64 cpuusage_read(struct cgroup_subsys_state *css, struct cftype *cft)
{
return __cpuusage_read(css, CPUACCT_USAGE_NRUSAGE);
}
static int cpuusage_write(struct cgroup_subsys_state *css, struct cftype *cft,
u64 val)
{
struct cpuacct *ca = css_ca(css);
int err = 0;
int i;
int cpu;
/*
* Only allow '0' here to do a reset.
*/
if (val) {
err = -EINVAL;
goto out;
}
if (val)
return -EINVAL;
for_each_possible_cpu(i)
cpuacct_cpuusage_write(ca, i, 0);
for_each_possible_cpu(cpu)
cpuacct_cpuusage_write(ca, cpu, 0);
out:
return err;
return 0;
}
static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
static int __cpuacct_percpu_seq_show(struct seq_file *m,
enum cpuacct_usage_index index)
{
struct cpuacct *ca = css_ca(seq_css(m));
u64 percpu;
int i;
for_each_possible_cpu(i) {
percpu = cpuacct_cpuusage_read(ca, i);
percpu = cpuacct_cpuusage_read(ca, i, index);
seq_printf(m, "%llu ", (unsigned long long) percpu);
}
seq_printf(m, "\n");
return 0;
}
static int cpuacct_percpu_user_seq_show(struct seq_file *m, void *V)
{
return __cpuacct_percpu_seq_show(m, CPUACCT_USAGE_USER);
}
static int cpuacct_percpu_sys_seq_show(struct seq_file *m, void *V)
{
return __cpuacct_percpu_seq_show(m, CPUACCT_USAGE_SYSTEM);
}
static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
{
return __cpuacct_percpu_seq_show(m, CPUACCT_USAGE_NRUSAGE);
}
static const char * const cpuacct_stat_desc[] = {
[CPUACCT_STAT_USER] = "user",
[CPUACCT_STAT_SYSTEM] = "system",
@ -219,10 +281,26 @@ static struct cftype files[] = {
.read_u64 = cpuusage_read,
.write_u64 = cpuusage_write,
},
{
.name = "usage_user",
.read_u64 = cpuusage_user_read,
},
{
.name = "usage_sys",
.read_u64 = cpuusage_sys_read,
},
{
.name = "usage_percpu",
.seq_show = cpuacct_percpu_seq_show,
},
{
.name = "usage_percpu_user",
.seq_show = cpuacct_percpu_user_seq_show,
},
{
.name = "usage_percpu_sys",
.seq_show = cpuacct_percpu_sys_seq_show,
},
{
.name = "stat",
.seq_show = cpuacct_stats_show,
@ -238,10 +316,18 @@ static struct cftype files[] = {
void cpuacct_charge(struct task_struct *tsk, u64 cputime)
{
struct cpuacct *ca;
int index;
if (user_mode(task_pt_regs(tsk)))
index = CPUACCT_USAGE_USER;
else
index = CPUACCT_USAGE_SYSTEM;
rcu_read_lock();
for (ca = task_ca(tsk); ca; ca = parent_ca(ca))
*this_cpu_ptr(ca->cpuusage) += cputime;
this_cpu_ptr(ca->cpuusage)->usages[index] += cputime;
rcu_read_unlock();
}