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Diffstat (limited to 'include/linux/res_counter.h')
-rw-r--r--include/linux/res_counter.h29
1 files changed, 28 insertions, 1 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 61363ce896d..6d9e1fca098 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -9,6 +9,8 @@
*
* Author: Pavel Emelianov <xemul@openvz.org>
*
+ * See Documentation/controllers/resource_counter.txt for more
+ * info about what this counter is.
*/
#include <linux/cgroup.h>
@@ -25,6 +27,10 @@ struct res_counter {
*/
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;
@@ -39,8 +45,9 @@ struct res_counter {
spinlock_t lock;
};
-/*
+/**
* 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
*
@@ -51,6 +58,8 @@ struct res_counter {
* @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));
@@ -64,6 +73,7 @@ ssize_t res_counter_write(struct res_counter *counter, int member,
enum {
RES_USAGE,
+ RES_MAX_USAGE,
RES_LIMIT,
RES_FAILCNT,
};
@@ -124,4 +134,21 @@ static inline bool res_counter_check_under_limit(struct res_counter *cnt)
return ret;
}
+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);
+}
#endif