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-rw-r--r--include/linux/res_counter.h72
1 files changed, 14 insertions, 58 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index a5930cb66145..c9d625ca659e 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -129,20 +129,22 @@ int __must_check res_counter_charge(struct res_counter *counter,
void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
void res_counter_uncharge(struct res_counter *counter, unsigned long val);
-static inline bool res_counter_limit_check_locked(struct res_counter *cnt)
-{
- if (cnt->usage < cnt->limit)
- return true;
-
- return false;
-}
-
-static inline bool res_counter_soft_limit_check_locked(struct res_counter *cnt)
+/**
+ * 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)
{
- if (cnt->usage < cnt->soft_limit)
- return true;
+ unsigned long long margin;
+ unsigned long flags;
- return false;
+ spin_lock_irqsave(&cnt->lock, flags);
+ margin = cnt->limit - cnt->usage;
+ spin_unlock_irqrestore(&cnt->lock, flags);
+ return margin;
}
/**
@@ -167,52 +169,6 @@ res_counter_soft_limit_excess(struct res_counter *cnt)
return excess;
}
-/*
- * Helper function to detect if the cgroup is within it's limit or
- * not. It's currently called from cgroup_rss_prepare()
- */
-static inline bool res_counter_check_under_limit(struct res_counter *cnt)
-{
- bool ret;
- unsigned long flags;
-
- spin_lock_irqsave(&cnt->lock, flags);
- ret = res_counter_limit_check_locked(cnt);
- spin_unlock_irqrestore(&cnt->lock, flags);
- return ret;
-}
-
-/**
- * res_counter_check_margin - check if the counter allows charging
- * @cnt: the resource counter to check
- * @bytes: the number of bytes to check the remaining space against
- *
- * Returns a boolean value on whether the counter can be charged
- * @bytes or whether this would exceed the limit.
- */
-static inline bool res_counter_check_margin(struct res_counter *cnt,
- unsigned long bytes)
-{
- bool ret;
- unsigned long flags;
-
- spin_lock_irqsave(&cnt->lock, flags);
- ret = cnt->limit - cnt->usage >= bytes;
- spin_unlock_irqrestore(&cnt->lock, flags);
- return ret;
-}
-
-static inline bool res_counter_check_under_soft_limit(struct res_counter *cnt)
-{
- bool ret;
- unsigned long flags;
-
- spin_lock_irqsave(&cnt->lock, flags);
- ret = res_counter_soft_limit_check_locked(cnt);
- spin_unlock_irqrestore(&cnt->lock, flags);
- return ret;
-}
-
static inline void res_counter_reset_max(struct res_counter *cnt)
{
unsigned long flags;