The cpuacct cgroup already exposes user and system numbers in a per-cgroup
fashion. But they are a summation along the whole group, not a per-cpu figure.
Also, they are coarse-grained version of the stats usually shown at places
like /proc/stat.
I want to have enough cgroup data to emulate the /proc/stat interface. To
achieve that, I am creating a new file "stat_percpu" that displays the
fine-grained per-cpu data. The original data is left alone.
Note that in this first version, I am using clock_t units, being quite
proc-centric. It made my testing easier, but I am happy to show any units
you guys would prefer.
Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
---
kernel/sched/core.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 91ea913..013ca9c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8308,6 +8308,29 @@ static int cpuacct_stats_show(struct cgroup *cgrp, struct cftype *cft,
return 0;
}
+static int cpuacct_stats_percpu_show(struct cgroup *cgrp, struct cftype *cft,
+ struct seq_file *m)
+{
+ struct cpuacct *ca = cgroup_ca(cgrp);
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
+ seq_printf(m,
+ "cpu%d %llu %llu %llu %llu %llu %llu %llu\n", cpu,
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_USER]),
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_NICE]),
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_SYSTEM]),
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_IRQ]),
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_SOFTIRQ]),
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_GUEST]),
+ (unsigned long long)cputime_to_clock_t(kcpustat->cpustat[CPUTIME_GUEST_NICE])
+ );
+ }
+
+ return 0;
+}
+
static struct cftype files[] = {
{
.name = "usage",
@@ -8322,6 +8345,11 @@ static struct cftype files[] = {
.name = "stat",
.read_map = cpuacct_stats_show,
},
+ {
+ .name = "stat_percpu",
+ .read_seq_string = cpuacct_stats_percpu_show,
+ },
+
};
static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
--
1.7.7.4
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