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Message-ID: <45B25110.2070301@in.ibm.com>
Date: Sat, 20 Jan 2007 22:57:44 +0530
From: Balbir Singh <balbir@...ibm.com>
To: Paul Menage <menage@...gle.com>
CC: vatsa@...ibm.com, ckrm-tech@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, xemul@...ru, rohitseth@...gle.com,
pj@....com, mbligh@...gle.com, winget@...gle.com, dev@...ru,
devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH 3/6] containers: Add generic multi-subsystem
API to containers
Paul Menage wrote:
> On 1/11/07, Balbir Singh <balbir@...ibm.com> wrote:
>> to 0. To walk the hierarchy, I have no root now since I do not have
>> any task context. I was wondering if exporting the rootnode or providing
>> a function to export the rootnode of the mounter hierarchy will make
>> programming easier.
>
> Ah - I misunderstood what you were looking for before.
Here it is, a simple patch to keep track of percentage cpu load of a
container. This patch depends on the add mount callbacks patch and another
patch that fixes cpuacct for powerpc boxes (posted previously).
The patch attempts to add a percentage load calculation for each
container. It also maintains an accumulated time counter, which accounts
for the total cpu time taken by the container.
Compiled and tested on a 4 cpu powerpc box. Paul, please include this in
your next series of patches for containers.
Signed-off-by: <balbir@...ibm.com>
---
include/linux/cpu_acct.h | 4 ++
kernel/cpu_acct.c | 90
+++++++++++++++++++++++++++++++++++++++++++----
kernel/sched.c | 7 ++-
3 files changed, 93 insertions(+), 8 deletions(-)
diff -puN kernel/cpu_acct.c~cpu_acct_load_acct kernel/cpu_acct.c
--- linux-2.6.20-rc5/kernel/cpu_acct.c~cpu_acct_load_acct 2007-01-20
18:28:26.000000000 +0530
+++ linux-2.6.20-rc5-balbir/kernel/cpu_acct.c 2007-01-20 22:32:49.000000000
+0530
@@ -13,16 +13,22 @@
#include <linux/module.h>
#include <linux/container.h>
#include <linux/fs.h>
+#include <linux/time.h>
#include <asm/div64.h>
struct cpuacct {
struct container_subsys_state css;
spinlock_t lock;
cputime64_t time; // total time used by this class
+ cputime64_t accum_time; // total time used by this class
};
static struct container_subsys cpuacct_subsys;
static struct container *root;
+static spinlock_t interval_lock;
+static cputime64_t interval_time;
+static unsigned long long timestamp;
+static unsigned long long interval;
static inline struct cpuacct *container_ca(struct container *cont)
{
@@ -41,6 +47,8 @@ static int cpuacct_create(struct contain
if (!ca) return -ENOMEM;
spin_lock_init(&ca->lock);
cont->subsys[cpuacct_subsys.subsys_id] = &ca->css;
+ ca->time = cputime64_zero;
+ ca->accum_time = cputime64_zero;
return 0;
}
@@ -67,17 +75,35 @@ static ssize_t cpuusage_read(struct cont
size_t nbytes, loff_t *ppos)
{
struct cpuacct *ca = container_ca(cont);
- cputime64_t time;
- unsigned long time_in_jiffies;
+ unsigned long long time;
+ unsigned long long accum_time;
+ unsigned long long interval_jiffies;
char usagebuf[64];
char *s = usagebuf;
spin_lock_irq(&ca->lock);
- time = ca->time;
+ time = cputime64_to_jiffies64(ca->time);
+ accum_time = cputime64_to_jiffies64(ca->accum_time);
spin_unlock_irq(&ca->lock);
- time_in_jiffies = cputime_to_jiffies(time);
- s += sprintf(s, "%llu\n", (unsigned long long) time_in_jiffies);
+ spin_lock_irq(&interval_lock);
+ interval_jiffies = cputime64_to_jiffies64(interval_time);
+ spin_unlock_irq(&interval_lock);
+
+ s += sprintf(s, "time %llu\n", time);
+ s += sprintf(s, "accumulated time %llu\n", accum_time);
+ s += sprintf(s, "time since interval %llu\n", interval_jiffies);
+
+ /*
+ * Calculate time in percentage
+ */
+ time *= 100;
+ if (interval_jiffies)
+ do_div(time, interval_jiffies);
+ else
+ time = 0;
+
+ s += sprintf(s, "load %llu\n", time);
return simple_read_from_buffer(buf, nbytes, ppos, usagebuf, s - usagebuf);
}
@@ -96,7 +122,6 @@ static int cpuacct_populate(struct conta
void cpuacct_charge(struct task_struct *task, cputime_t cputime)
{
-
struct cpuacct *ca;
unsigned long flags;
@@ -106,11 +131,60 @@ void cpuacct_charge(struct task_struct *
if (ca) {
spin_lock_irqsave(&ca->lock, flags);
ca->time = cputime64_add(ca->time, cputime);
+ ca->accum_time = cputime64_add(ca->accum_time, cputime);
spin_unlock_irqrestore(&ca->lock, flags);
}
rcu_read_unlock();
}
+void cpuacct_uncharge(struct task_struct *task, cputime_t cputime)
+{
+ struct cpuacct *ca;
+ unsigned long flags;
+
+ if (cpuacct_subsys.subsys_id < 0 || !root) return;
+ rcu_read_lock();
+ ca = task_ca(task);
+ if (ca) {
+ spin_lock_irqsave(&ca->lock, flags);
+ ca->time = cputime64_sub(ca->time, cputime);
+ ca->accum_time = cputime64_sub(ca->accum_time, cputime);
+ spin_unlock_irqrestore(&ca->lock, flags);
+ }
+ rcu_read_unlock();
+}
+
+static void reset_ca_time(struct container *root)
+{
+ struct container *child;
+ struct cpuacct *ca;
+
+ if (root) {
+ ca = container_ca(root);
+ if (ca) {
+ spin_lock(&ca->lock);
+ ca->time = cputime64_zero;
+ spin_unlock(&ca->lock);
+ }
+ list_for_each_entry(child, &root->children, sibling)
+ reset_ca_time(child);
+ }
+}
+
+void cpuacct_update_time(cputime_t cputime)
+{
+ unsigned long flags;
+ unsigned long long timestamp_now = get_jiffies_64();
+ spin_lock_irqsave(&interval_lock, flags);
+ interval_time += cputime_to_cputime64(cputime);
+ if ((timestamp_now - timestamp) > interval) {
+ timestamp = timestamp_now;
+ reset_ca_time(root);
+ interval_time = cputime64_zero;
+ }
+ spin_unlock_irqrestore(&interval_lock, flags);
+}
+
static struct container_subsys cpuacct_subsys = {
.name = "cpuacct",
.create = cpuacct_create,
@@ -127,6 +201,10 @@ int __init init_cpuacct(void)
int id;
root = NULL;
+ interval = 10 * HZ;
+ interval_time = cputime64_zero;
+ timestamp = get_jiffies_64();
+ spin_lock_init(&interval_lock);
id = container_register_subsys(&cpuacct_subsys);
return id < 0 ? id : 0;
}
diff -puN kernel/sched.c~cpu_acct_load_acct kernel/sched.c
--- linux-2.6.20-rc5/kernel/sched.c~cpu_acct_load_acct 2007-01-20
18:28:26.000000000 +0530
+++ linux-2.6.20-rc5-balbir/kernel/sched.c 2007-01-20 21:51:27.000000000 +0530
@@ -3078,7 +3078,7 @@ void account_user_time(struct task_struc
*/
if (p != rq->idle)
cpuacct_charge(p, cputime);
-
+ cpuacct_update_time(cputime);
/* Add user time to cpustat. */
tmp = cputime_to_cputime64(cputime);
if (TASK_NICE(p) > 0)
@@ -3100,6 +3100,7 @@ void account_system_time(struct task_str
struct rq *rq = this_rq();
cputime64_t tmp;
+ cpuacct_update_time(cputime);
p->stime = cputime_add(p->stime, cputime);
/* Add system time to cpustat. */
@@ -3136,8 +3137,10 @@ void account_steal_time(struct task_stru
cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
else
cpustat->idle = cputime64_add(cpustat->idle, tmp);
- } else
+ } else {
cpustat->steal = cputime64_add(cpustat->steal, tmp);
+ cpuacct_uncharge(p, tmp);
+ }
}
static void task_running_tick(struct rq *rq, struct task_struct *p)
diff -puN include/linux/cpu_acct.h~cpu_acct_load_acct include/linux/cpu_acct.h
--- linux-2.6.20-rc5/include/linux/cpu_acct.h~cpu_acct_load_acct 2007-01-20
18:28:33.000000000 +0530
+++ linux-2.6.20-rc5-balbir/include/linux/cpu_acct.h 2007-01-20
21:51:43.000000000 +0530
@@ -7,8 +7,12 @@
#ifdef CONFIG_CONTAINER_CPUACCT
extern void cpuacct_charge(struct task_struct *, cputime_t cputime);
+extern void cpuacct_uncharge(struct task_struct *, cputime_t cputime);
+extern void cpuacct_update_time(cputime_t cputime);
#else
static void inline cpuacct_charge(struct task_struct *p, cputime_t cputime) {}
+static void inline cpuacct_uncharge(struct task_struct *p, cputime_t
cputime) {}
+static void inline cpuacct_update_time(cputime_t cputime) {}
#endif
#endif
_
--
Balbir Singh
Linux Technology Center
IBM, ISTL
-
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