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 <[email protected]> --- 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 _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
