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sched: report CPU usage in CFS cgroup directories

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Adds a cpu.usage file to the CFS cgroup that reports CPU usage in
milliseconds for that cgroup's tasks

[ mingo@elte.hu: style cleanups. ]

Signed-off-by: Paul Menage <menage@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Menage 2007-10-29 21:18:11 +01:00 committed by Ingo Molnar
parent ae8393e508
commit fe5c7cc228
1 changed files with 33 additions and 5 deletions
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38
kernel/sched.c
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@ -7211,15 +7211,43 @@ static u64 cpu_shares_read_uint(struct cgroup *cgrp, struct cftype *cft)
return (u64) tg->shares;
}
static struct cftype cpu_shares = {
.name = "shares",
.read_uint = cpu_shares_read_uint,
.write_uint = cpu_shares_write_uint,
static u64 cpu_usage_read(struct cgroup *cgrp, struct cftype *cft)
{
struct task_group *tg = cgroup_tg(cgrp);
unsigned long flags;
u64 res = 0;
int i;
for_each_possible_cpu(i) {
/*
* Lock to prevent races with updating 64-bit counters
* on 32-bit arches.
*/
spin_lock_irqsave(&cpu_rq(i)->lock, flags);
res += tg->se[i]->sum_exec_runtime;
spin_unlock_irqrestore(&cpu_rq(i)->lock, flags);
}
/* Convert from ns to ms */
do_div(res, 1000000);
return res;
}
static struct cftype cpu_files[] = {
{
.name = "shares",
.read_uint = cpu_shares_read_uint,
.write_uint = cpu_shares_write_uint,
},
{
.name = "usage",
.read_uint = cpu_usage_read,
},
};
static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
{
return cgroup_add_file(cont, ss, &cpu_shares);
return cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
}
struct cgroup_subsys cpu_cgroup_subsys = {