revert "Task Control Groups: example CPU accounting subsystem"

Revert 62d0df64065e7c135d0002f069444fbdfc64768f.

This was originally intended as a simple initial example of how to create a
control groups subsystem; it wasn't intended for mainline, but I didn't make
this clear enough to Andrew.

The CFS cgroup subsystem now has better functionality for the per-cgroup usage
accounting (based directly on CFS stats) than the "usage" status file in this
patch, and the "load" status file is rather simplistic - although having a
per-cgroup load average report would be a useful feature, I don't believe this
patch actually provides it.  If it gets into the final 2.6.24 we'd probably
have to support this interface for ever.

Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 3 insertions, 225 deletions

diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 0b9bfbde8168..d62fcee9a08a 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -13,12 +13,6 @@ SUBSYS(cpuset)
 
 /* */
 
-#ifdef CONFIG_CGROUP_CPUACCT
-SUBSYS(cpuacct)
-#endif
-
-/* */
-
 #ifdef CONFIG_CGROUP_DEBUG
 SUBSYS(debug)
 #endif
diff --git a/include/linux/cpu_acct.h b/include/linux/cpu_acct.h
deleted file mode 100644
index 6b5fd8a66c8d..000000000000
--- a/include/linux/cpu_acct.h
+++ /dev/null
@@ -1,14 +0,0 @@
-
-#ifndef _LINUX_CPU_ACCT_H
-#define _LINUX_CPU_ACCT_H
-
-#include <linux/cgroup.h>
-#include <asm/cputime.h>
-
-#ifdef CONFIG_CGROUP_CPUACCT
-extern void cpuacct_charge(struct task_struct *, cputime_t cputime);
-#else
-static void inline cpuacct_charge(struct task_struct *p, cputime_t cputime) {}
-#endif
-
-#endif
diff --git a/init/Kconfig b/init/Kconfig
index 8b88d0bedcbd..5b92e3aa1366 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -301,13 +301,6 @@ config CGROUP_NS
           for instance virtual servers and checkpoint/restart
           jobs.
 
-config CGROUP_CPUACCT
-        bool "Simple CPU accounting cgroup subsystem"
-        depends on CGROUPS
-        help
-          Provides a simple Resource Controller for monitoring the
-          total CPU consumed by the tasks in a cgroup
-
 config CPUSETS
         bool "Cpuset support"
         depends on SMP && CGROUPS
diff --git a/kernel/Makefile b/kernel/Makefile
index f60afe742599..dfa96956dae0 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -40,7 +40,6 @@ obj-$(CONFIG_COMPAT) += compat.o
 obj-$(CONFIG_CGROUPS) += cgroup.o
 obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
 obj-$(CONFIG_CPUSETS) += cpuset.o
-obj-$(CONFIG_CGROUP_CPUACCT) += cpu_acct.o
 obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
 obj-$(CONFIG_IKCONFIG) += configs.o
 obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
diff --git a/kernel/cpu_acct.c b/kernel/cpu_acct.c
deleted file mode 100644
index 731e47e7f164..000000000000
--- a/kernel/cpu_acct.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*
- * kernel/cpu_acct.c - CPU accounting cgroup subsystem
- *
- * Copyright (C) Google Inc, 2006
- *
- * Developed by Paul Menage (menage@google.com) and Balbir Singh
- * (balbir@in.ibm.com)
- *
- */
-
-/*
- * Example cgroup subsystem for reporting total CPU usage of tasks in a
- * cgroup, along with percentage load over a time interval
- */
-
-#include <linux/module.h>
-#include <linux/cgroup.h>
-#include <linux/fs.h>
-#include <linux/rcupdate.h>
-
-#include <asm/div64.h>
-
-struct cpuacct {
-        struct cgroup_subsys_state css;
-        spinlock_t lock;
-        /* total time used by this class */
-        cputime64_t time;
-
-        /* time when next load calculation occurs */
-        u64 next_interval_check;
-
-        /* time used in current period */
-        cputime64_t current_interval_time;
-
-        /* time used in last period */
-        cputime64_t last_interval_time;
-};
-
-struct cgroup_subsys cpuacct_subsys;
-
-static inline struct cpuacct *cgroup_ca(struct cgroup *cont)
-{
-        return container_of(cgroup_subsys_state(cont, cpuacct_subsys_id),
-                            struct cpuacct, css);
-}
-
-static inline struct cpuacct *task_ca(struct task_struct *task)
-{
-        return container_of(task_subsys_state(task, cpuacct_subsys_id),
-                            struct cpuacct, css);
-}
-
-#define INTERVAL (HZ * 10)
-
-static inline u64 next_interval_boundary(u64 now)
-{
-        /* calculate the next interval boundary beyond the
-         * current time */
-        do_div(now, INTERVAL);
-        return (now + 1) * INTERVAL;
-}
-
-static struct cgroup_subsys_state *cpuacct_create(
-        struct cgroup_subsys *ss, struct cgroup *cont)
-{
-        struct cpuacct *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
-
-        if (!ca)
-                return ERR_PTR(-ENOMEM);
-        spin_lock_init(&ca->lock);
-        ca->next_interval_check = next_interval_boundary(get_jiffies_64());
-        return &ca->css;
-}
-
-static void cpuacct_destroy(struct cgroup_subsys *ss,
-                            struct cgroup *cont)
-{
-        kfree(cgroup_ca(cont));
-}
-
-/* Lazily update the load calculation if necessary. Called with ca locked */
-static void cpuusage_update(struct cpuacct *ca)
-{
-        u64 now = get_jiffies_64();
-
-        /* If we're not due for an update, return */
-        if (ca->next_interval_check > now)
-                return;
-
-        if (ca->next_interval_check <= (now - INTERVAL)) {
-                /* If it's been more than an interval since the last
-                 * check, then catch up - the last interval must have
-                 * been zero load */
-                ca->last_interval_time = 0;
-                ca->next_interval_check = next_interval_boundary(now);
-        } else {
-                /* If a steal takes the last interval time negative,
-                 * then we just ignore it */
-                if ((s64)ca->current_interval_time > 0)
-                        ca->last_interval_time = ca->current_interval_time;
-                else
-                        ca->last_interval_time = 0;
-                ca->next_interval_check += INTERVAL;
-        }
-        ca->current_interval_time = 0;
-}
-
-static u64 cpuusage_read(struct cgroup *cont, struct cftype *cft)
-{
-        struct cpuacct *ca = cgroup_ca(cont);
-        u64 time;
-
-        spin_lock_irq(&ca->lock);
-        cpuusage_update(ca);
-        time = cputime64_to_jiffies64(ca->time);
-        spin_unlock_irq(&ca->lock);
-
-        /* Convert 64-bit jiffies to seconds */
-        time *= 1000;
-        do_div(time, HZ);
-        return time;
-}
-
-static u64 load_read(struct cgroup *cont, struct cftype *cft)
-{
-        struct cpuacct *ca = cgroup_ca(cont);
-        u64 time;
-
-        /* Find the time used in the previous interval */
-        spin_lock_irq(&ca->lock);
-        cpuusage_update(ca);