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-rw-r--r--Documentation/cgroup-v2.txt15
-rw-r--r--include/linux/cgroup-defs.h2
-rw-r--r--include/linux/cgroup.h2
-rw-r--r--kernel/cgroup/cgroup-internal.h1
-rw-r--r--kernel/cgroup/cgroup.c60
-rw-r--r--kernel/cgroup/stat.c10
-rw-r--r--kernel/sched/core.c13
7 files changed, 75 insertions, 28 deletions
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index 0bbdc720dd7c..779211fbb69f 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -886,15 +886,6 @@ All cgroup core files are prefixed with "cgroup."
A dying cgroup can consume system resources not exceeding
limits, which were active at the moment of cgroup deletion.
- cpu.usage_usec
- CPU time consumed in the subtree.
-
- cpu.user_usec
- User CPU time consumed in the subtree.
-
- cpu.system_usec
- System CPU time consumed in the subtree.
-
Controllers
===========
@@ -915,12 +906,16 @@ All time durations are in microseconds.
cpu.stat
A read-only flat-keyed file which exists on non-root cgroups.
+ This file exists whether the controller is enabled or not.
- It reports the following six stats:
+ It always reports the following three stats:
- usage_usec
- user_usec
- system_usec
+
+ and the following three when the controller is enabled:
+
- nr_periods
- nr_throttled
- throttled_usec
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 3e55bbd31ad1..ada6df7b1f55 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -569,6 +569,8 @@ struct cgroup_subsys {
void (*css_released)(struct cgroup_subsys_state *css);
void (*css_free)(struct cgroup_subsys_state *css);
void (*css_reset)(struct cgroup_subsys_state *css);
+ int (*css_extra_stat_show)(struct seq_file *seq,
+ struct cgroup_subsys_state *css);
int (*can_attach)(struct cgroup_taskset *tset);
void (*cancel_attach)(struct cgroup_taskset *tset);
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 328a70ce0e23..03cad08b09d1 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -703,8 +703,6 @@ static inline void cpuacct_account_field(struct task_struct *tsk, int index,
u64 val) {}
#endif
-void cgroup_stat_show_cputime(struct seq_file *seq, const char *prefix);
-
void __cgroup_account_cputime(struct cgroup *cgrp, u64 delta_exec);
void __cgroup_account_cputime_field(struct cgroup *cgrp,
enum cpu_usage_stat index, u64 delta_exec);
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index fa642c99586a..4dc317090920 100644
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -205,6 +205,7 @@ int cgroup_task_count(const struct cgroup *cgrp);
void cgroup_stat_flush(struct cgroup *cgrp);
int cgroup_stat_init(struct cgroup *cgrp);
void cgroup_stat_exit(struct cgroup *cgrp);
+void cgroup_stat_show_cputime(struct seq_file *seq);
void cgroup_stat_boot(void);
/*
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 7975b20f1fd1..d9773e49a1b4 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -464,6 +464,28 @@ static struct cgroup_subsys_state *cgroup_css(struct cgroup *cgrp,
}
/**
+ * cgroup_tryget_css - try to get a cgroup's css for the specified subsystem
+ * @cgrp: the cgroup of interest
+ * @ss: the subsystem of interest
+ *
+ * Find and get @cgrp's css assocaited with @ss. If the css doesn't exist
+ * or is offline, %NULL is returned.
+ */
+static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp,
+ struct cgroup_subsys *ss)
+{
+ struct cgroup_subsys_state *css;
+
+ rcu_read_lock();
+ css = cgroup_css(cgrp, ss);
+ if (!css || !css_tryget_online(css))
+ css = NULL;
+ rcu_read_unlock();
+
+ return css;
+}
+
+/**
* cgroup_e_css - obtain a cgroup's effective css for the specified subsystem
* @cgrp: the cgroup of interest
* @ss: the subsystem of interest (%NULL returns @cgrp->self)
@@ -3311,11 +3333,40 @@ static int cgroup_stat_show(struct seq_file *seq, void *v)
seq_printf(seq, "nr_dying_descendants %d\n",
cgroup->nr_dying_descendants);
- cgroup_stat_show_cputime(seq, "cpu.");
-
return 0;
}
+static int __maybe_unused cgroup_extra_stat_show(struct seq_file *seq,
+ struct cgroup *cgrp, int ssid)
+{
+ struct cgroup_subsys *ss = cgroup_subsys[ssid];
+ struct cgroup_subsys_state *css;
+ int ret;
+
+ if (!ss->css_extra_stat_show)
+ return 0;
+
+ css = cgroup_tryget_css(cgrp, ss);
+ if (!css)
+ return 0;
+
+ ret = ss->css_extra_stat_show(seq, css);
+ css_put(css);
+ return ret;
+}
+
+static int cpu_stat_show(struct seq_file *seq, void *v)
+{
+ struct cgroup *cgrp = seq_css(seq)->cgroup;
+ int ret = 0;
+
+ cgroup_stat_show_cputime(seq);
+#ifdef CONFIG_CGROUP_SCHED
+ ret = cgroup_extra_stat_show(seq, cgrp, cpu_cgrp_id);
+#endif
+ return ret;
+}
+
static int cgroup_file_open(struct kernfs_open_file *of)
{
struct cftype *cft = of->kn->priv;
@@ -4423,6 +4474,11 @@ static struct cftype cgroup_base_files[] = {
.name = "cgroup.stat",
.seq_show = cgroup_stat_show,
},
+ {
+ .name = "cpu.stat",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .seq_show = cpu_stat_show,
+ },
{ } /* terminate */
};
diff --git a/kernel/cgroup/stat.c b/kernel/cgroup/stat.c
index 9cce79e89320..133b465691d6 100644
--- a/kernel/cgroup/stat.c
+++ b/kernel/cgroup/stat.c
@@ -256,7 +256,7 @@ void __cgroup_account_cputime_field(struct cgroup *cgrp,
cgroup_cpu_stat_account_end(cgrp, cstat);
}
-void cgroup_stat_show_cputime(struct seq_file *seq, const char *prefix)
+void cgroup_stat_show_cputime(struct seq_file *seq)
{
struct cgroup *cgrp = seq_css(seq)->cgroup;
u64 usage, utime, stime;
@@ -278,10 +278,10 @@ void cgroup_stat_show_cputime(struct seq_file *seq, const char *prefix)
do_div(utime, NSEC_PER_USEC);
do_div(stime, NSEC_PER_USEC);
- seq_printf(seq, "%susage_usec %llu\n"
- "%suser_usec %llu\n"
- "%ssystem_usec %llu\n",
- prefix, usage, prefix, utime, prefix, stime);
+ seq_printf(seq, "usage_usec %llu\n"
+ "user_usec %llu\n"
+ "system_usec %llu\n",
+ usage, utime, stime);
}
int cgroup_stat_init(struct cgroup *cgrp)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ad255162a830..0b3eec389552 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6678,13 +6678,12 @@ static struct cftype cpu_legacy_files[] = {
{ } /* Terminate */
};
-static int cpu_stat_show(struct seq_file *sf, void *v)
+static int cpu_extra_stat_show(struct seq_file *sf,
+ struct cgroup_subsys_state *css)
{
- cgroup_stat_show_cputime(sf, "");
-
#ifdef CONFIG_CFS_BANDWIDTH
{
- struct task_group *tg = css_tg(seq_css(sf));
+ struct task_group *tg = css_tg(css);
struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
u64 throttled_usec;
@@ -6817,11 +6816,6 @@ static ssize_t cpu_max_write(struct kernfs_open_file *of,
#endif
static struct cftype cpu_files[] = {
- {
- .name = "stat",
- .flags = CFTYPE_NOT_ON_ROOT,
- .seq_show = cpu_stat_show,
- },
#ifdef CONFIG_FAIR_GROUP_SCHED
{
.name = "weight",
@@ -6852,6 +6846,7 @@ struct cgroup_subsys cpu_cgrp_subsys = {
.css_online = cpu_cgroup_css_online,
.css_released = cpu_cgroup_css_released,
.css_free = cpu_cgroup_css_free,
+ .css_extra_stat_show = cpu_extra_stat_show,
.fork = cpu_cgroup_fork,
.can_attach = cpu_cgroup_can_attach,
.attach = cpu_cgroup_attach,