kernel: res_counter: remove the unused API

All memory accounting and limiting has been switched over to the
lockless page counters.  Bye, res_counter!

[akpm@linux-foundation.org: update Documentation/cgroups/memory.txt]
[mhocko@suse.cz: ditch the last remainings of res_counter]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Tejun Heo <tj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 223 deletions

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
deleted file mode 100644
index 56b7bc32db4f..000000000000
--- a/include/linux/res_counter.h
+++ /dev/null
@@ -1,223 +0,0 @@
-#ifndef __RES_COUNTER_H__
-#define __RES_COUNTER_H__
-
-/*
- * Resource Counters
- * Contain common data types and routines for resource accounting
- *
- * Copyright 2007 OpenVZ SWsoft Inc
- *
- * Author: Pavel Emelianov <xemul@openvz.org>
- *
- * See Documentation/cgroups/resource_counter.txt for more
- * info about what this counter is.
- */
-
-#include <linux/spinlock.h>
-#include <linux/errno.h>
-
-/*
- * The core object. the cgroup that wishes to account for some
- * resource may include this counter into its structures and use
- * the helpers described beyond
- */
-
-struct res_counter {
-        /*
-         * the current resource consumption level
-         */
-        unsigned long long usage;
-        /*
-         * the maximal value of the usage from the counter creation
-         */
-        unsigned long long max_usage;
-        /*
-         * the limit that usage cannot exceed
-         */
-        unsigned long long limit;
-        /*
-         * the limit that usage can be exceed
-         */
-        unsigned long long soft_limit;
-        /*
-         * the number of unsuccessful attempts to consume the resource
-         */
-        unsigned long long failcnt;
-        /*
-         * the lock to protect all of the above.
-         * the routines below consider this to be IRQ-safe
-         */
-        spinlock_t lock;
-        /*
-         * Parent counter, used for hierarchial resource accounting
-         */
-        struct res_counter *parent;
-};
-
-#define RES_COUNTER_MAX ULLONG_MAX
-
-/**
- * Helpers to interact with userspace
- * res_counter_read_u64() - returns the value of the specified member.
- * res_counter_read/_write - put/get the specified fields from the
- * res_counter struct to/from the user
- *
- * @counter:     the counter in question
- * @member:  the field to work with (see RES_xxx below)
- * @buf:     the buffer to opeate on,...
- * @nbytes:  its size...
- * @pos:     and the offset.
- */
-
-u64 res_counter_read_u64(struct res_counter *counter, int member);
-
-ssize_t res_counter_read(struct res_counter *counter, int member,
-                const char __user *buf, size_t nbytes, loff_t *pos,
-                int (*read_strategy)(unsigned long long val, char *s));
-
-int res_counter_memparse_write_strategy(const char *buf,
-                                        unsigned long long *res);
-
-/*
- * the field descriptors. one for each member of res_counter
- */
-
-enum {
-        RES_USAGE,
-        RES_MAX_USAGE,
-        RES_LIMIT,
-        RES_FAILCNT,
-        RES_SOFT_LIMIT,
-};
-
-/*
- * helpers for accounting
- */
-
-void res_counter_init(struct res_counter *counter, struct res_counter *parent);
-
-/*
- * charge - try to consume more resource.
- *
- * @counter: the counter
- * @val: the amount of the resource. each controller defines its own
- *       units, e.g. numbers, bytes, Kbytes, etc
- *
- * returns 0 on success and <0 if the counter->usage will exceed the
- * counter->limit
- *
- * charge_nofail works the same, except that it charges the resource
- * counter unconditionally, and returns < 0 if the after the current
- * charge we are over limit.
- */
-
-int __must_check res_counter_charge(struct res_counter *counter,
-                unsigned long val, struct res_counter **limit_fail_at);
-int res_counter_charge_nofail(struct res_counter *counter,
-                unsigned long val, struct res_counter **limit_fail_at);
-
-/*
- * uncharge - tell that some portion of the resource is released
- *
- * @counter: the counter
- * @val: the amount of the resource
- *
- * these calls check for usage underflow and show a warning on the console
- *
- * returns the total charges still present in @counter.
- */
-
-u64 res_counter_uncharge(struct res_counter *counter, unsigned long val);
-
-u64 res_counter_uncharge_until(struct res_counter *counter,
-                               struct res_counter *top,
-                               unsigned long val);
-/**
- * res_counter_margin - calculate chargeable space of a counter
- * @cnt: the counter
- *
- * Returns the difference between the hard limit and the current usage
- * of resource counter @cnt.
- */
-static inline unsigned long long res_counter_margin(struct res_counter *cnt)
-{
-        unsigned long long margin;
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        if (cnt->limit > cnt->usage)
-                margin = cnt->limit - cnt->usage;
-        else
-                margin = 0;
-        spin_unlock_irqrestore(&cnt->lock, flags);
-        return margin;
-}
-
-/**
- * Get the difference between the usage and the soft limit
- * @cnt: The counter
- *
- * Returns 0 if usage is less than or equal to soft limit
- * The difference between usage and soft limit, otherwise.
- */
-static inline unsigned long long
-res_counter_soft_limit_excess(struct res_counter *cnt)
-{
-        unsigned long long excess;
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        if (cnt->usage <= cnt->soft_limit)
-                excess = 0;
-        else
-                excess = cnt->usage - cnt->soft_limit;
-        spin_unlock_irqrestore(&cnt->lock, flags);
-        return excess;
-}
-
-static inline void res_counter_reset_max(struct res_counter *cnt)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        cnt->max_usage = cnt->usage;
-        spin_unlock_irqrestore(&cnt->lock, flags);
-}
-
-static inline void res_counter_reset_failcnt(struct res_counter *cnt)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        cnt->failcnt = 0;
-        spin_unlock_irqrestore(&cnt->lock, flags);
-}
-
-static inline int res_counter_set_limit(struct res_counter *cnt,
-                unsigned long long limit)
-{
-        unsigned long flags;
-        int ret = -EBUSY;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        if (cnt->usage <= limit) {
-                cnt->limit = limit;
-                ret = 0;
-        }
-        spin_unlock_irqrestore(&cnt->lock, flags);
-        return ret;
-}
-
-static inline int
-res_counter_set_soft_limit(struct res_counter *cnt,
-                                unsigned long long soft_limit)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&cnt->lock, flags);
-        cnt->soft_limit = soft_limit;
-        spin_unlock_irqrestore(&cnt->lock, flags);
-        return 0;
-}
-
-#endif