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Date: Wed, 25 Feb 2009 16:29:20 +0530
From: Bharata B Rao <bharata@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: Balaji Rao <balajirrao@...il.com>,
Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
Balbir Singh <balbir@...ux.vnet.ibm.com>,
Li Zefan <lizf@...fujitsu.com>,
Paul Menage <menage@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [RFC PATCH 2/2] Add per-cgroup CPU controller statistics
From: Balaji Rao <balajirrao@...il.com>
sched: Add cpu controller statistics
Add per-cgroup cpu controller statistics like system time and user time
consumed by groups of tasks.
Signed-off-by: Balaji Rao <balajirrao@...il.com>
Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
---
kernel/sched.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 106 insertions(+)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -263,10 +263,25 @@ struct cfs_rq;
static LIST_HEAD(task_groups);
+#ifdef CONFIG_CGROUP_SCHED
+enum cpu_cgroup_stat_index {
+ CPU_CGROUP_STAT_UTIME, /* User time of the task group */
+ CPU_CGROUP_STAT_STIME, /* Kernel time of the task group */
+ CPU_CGROUP_STAT_GTIME, /* Guest time of the task group */
+
+ CPU_CGROUP_STAT_NSTATS,
+};
+
+struct cpu_cgroup_stat {
+ struct percpu_counter cpustat[CPU_CGROUP_STAT_NSTATS];
+};
+#endif
+
/* task group related information */
struct task_group {
#ifdef CONFIG_CGROUP_SCHED
struct cgroup_subsys_state css;
+ struct cpu_cgroup_stat *stat;
#endif
#ifdef CONFIG_USER_SCHED
@@ -4159,6 +4174,19 @@ unsigned long long task_delta_exec(struc
return ns;
}
+#ifdef CONFIG_CGROUP_SCHED
+static void account_task_group_time(struct task_struct *p,
+ enum cpu_cgroup_stat_index idx, int val)
+{
+ struct task_group *tg = task_group(p);
+
+ if (likely(tg->stat))
+ percpu_counter_add(&tg->stat->cpustat[idx], val);
+}
+#else
+#define account_task_group_time(x, y, z) { 0; }
+#endif
+
/*
* Account user cpu time to a process.
* @p: the process that the cpu time gets accounted to
@@ -4182,6 +4210,10 @@ void account_user_time(struct task_struc
cpustat->nice = cputime64_add(cpustat->nice, tmp);
else
cpustat->user = cputime64_add(cpustat->user, tmp);
+
+ account_task_group_time(p, CPU_CGROUP_STAT_UTIME,
+ cputime_to_msecs(cputime));
+
/* Account for user time used */
acct_update_integrals(p);
}
@@ -4206,6 +4238,9 @@ static void account_guest_time(struct ta
account_group_user_time(p, cputime);
p->gtime = cputime_add(p->gtime, cputime);
+ account_task_group_time(p, CPU_CGROUP_STAT_GTIME,
+ cputime_to_msecs(cputime));
+
/* Add guest time to cpustat. */
cpustat->user = cputime64_add(cpustat->user, tmp);
cpustat->guest = cputime64_add(cpustat->guest, tmp);
@@ -4243,6 +4278,8 @@ void account_system_time(struct task_str
else
cpustat->system = cputime64_add(cpustat->system, tmp);
+ account_task_group_time(p, CPU_CGROUP_STAT_STIME,
+ cputime_to_msecs(cputime));
/* Account for system time used */
acct_update_integrals(p);
}
@@ -9290,6 +9327,7 @@ static struct cgroup_subsys_state *
cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
{
struct task_group *tg, *parent;
+ int i;
if (!cgrp->parent) {
/* This is early initialization for the top cgroup */
@@ -9301,6 +9339,15 @@ cpu_cgroup_create(struct cgroup_subsys *
if (IS_ERR(tg))
return ERR_PTR(-ENOMEM);
+ tg->stat = kmalloc(sizeof(struct cpu_cgroup_stat), GFP_KERNEL);
+ if (!tg->stat) {
+ sched_destroy_group(tg);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++)
+ percpu_counter_init(&tg->stat->cpustat[i], 0);
+
return &tg->css;
}
@@ -9308,6 +9355,13 @@ static void
cpu_cgroup_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp)
{
struct task_group *tg = cgroup_tg(cgrp);
+ int i;
+
+ if (tg->stat) {
+ for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++)
+ percpu_counter_destroy(&tg->stat->cpustat[i]);
+ kfree(tg->stat);
+ }
sched_destroy_group(tg);
}
@@ -9336,6 +9390,53 @@ cpu_cgroup_attach(struct cgroup_subsys *
sched_move_task(tsk);
}
+static void cpu_cgroup_initialize(void)
+{
+ int i;
+ struct cpu_cgroup_stat *stat;
+
+ stat = kmalloc(sizeof(struct cpu_cgroup_stat) , GFP_KERNEL);
+ if (!stat)
+ return;
+
+ for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++)
+ percpu_counter_init(&stat->cpustat[i], 0);
+ init_task_group.stat = stat;
+}
+
+static s64 cpu_cgroup_read_stat(struct cpu_cgroup_stat *stat,
+ enum cpu_cgroup_stat_index idx)
+{
+ if (stat)
+ return percpu_counter_read(&stat->cpustat[idx]);
+ return 0;
+}
+
+static const struct cpu_cgroup_stat_desc {
+ const char *msg;
+ u64 unit;
+} cpu_cgroup_stat_desc[] = {
+ [CPU_CGROUP_STAT_UTIME] = { "utime", 1, },
+ [CPU_CGROUP_STAT_STIME] = { "stime", 1, },
+ [CPU_CGROUP_STAT_GTIME] = { "gtime", 1, },
+};
+
+static int cpu_cgroup_stats_show(struct cgroup *cgrp, struct cftype *cft,
+ struct cgroup_map_cb *cb)
+{
+ struct task_group *tg = cgroup_tg(cgrp);
+ struct cpu_cgroup_stat *stat = tg->stat;
+ int i;
+
+ for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++) {
+ s64 val;
+ val = cpu_cgroup_read_stat(stat, i);
+ val *= cpu_cgroup_stat_desc[i].unit;
+ cb->fill(cb, cpu_cgroup_stat_desc[i].msg, val);
+ }
+ return 0;
+}
+
#ifdef CONFIG_FAIR_GROUP_SCHED
static int cpu_shares_write_u64(struct cgroup *cgrp, struct cftype *cftype,
u64 shareval)
@@ -9395,6 +9496,10 @@ static struct cftype cpu_files[] = {
.write_u64 = cpu_rt_period_write_uint,
},
#endif
+ {
+ .name = "stat",
+ .read_map = cpu_cgroup_stats_show,
+ },
};
static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
@@ -9409,6 +9514,7 @@ struct cgroup_subsys cpu_cgroup_subsys =
.can_attach = cpu_cgroup_can_attach,
.attach = cpu_cgroup_attach,
.populate = cpu_cgroup_populate,
+ .initialize = cpu_cgroup_initialize,
.subsys_id = cpu_cgroup_subsys_id,
.early_init = 1,
};
--
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