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-rw-r--r--Documentation/cgroups/resource_counter.txt7
-rw-r--r--include/linux/res_counter.h12
-rw-r--r--kernel/res_counter.c20
3 files changed, 24 insertions, 15 deletions
diff --git a/Documentation/cgroups/resource_counter.txt b/Documentation/cgroups/resource_counter.txt
index 0c4a344e78fa..c4d99ed0b418 100644
--- a/Documentation/cgroups/resource_counter.txt
+++ b/Documentation/cgroups/resource_counter.txt
@@ -83,16 +83,17 @@ to work with it.
res_counter->lock internally (it must be called with res_counter->lock
held). The force parameter indicates whether we can bypass the limit.
- e. void res_counter_uncharge[_locked]
+ e. u64 res_counter_uncharge[_locked]
(struct res_counter *rc, unsigned long val)
When a resource is released (freed) it should be de-accounted
from the resource counter it was accounted to. This is called
- "uncharging".
+ "uncharging". The return value of this function indicate the amount
+ of charges still present in the counter.
The _locked routines imply that the res_counter->lock is taken.
- f. void res_counter_uncharge_until
+ f. u64 res_counter_uncharge_until
(struct res_counter *rc, struct res_counter *top,
unsinged long val)
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 6f54e40fa218..5ae8456d9670 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -125,14 +125,16 @@ int res_counter_charge_nofail(struct res_counter *counter,
*
* these calls check for usage underflow and show a warning on the console
* _locked call expects the counter->lock to be taken
+ *
+ * returns the total charges still present in @counter.
*/
-void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
-void res_counter_uncharge(struct res_counter *counter, unsigned long val);
+u64 res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
+u64 res_counter_uncharge(struct res_counter *counter, unsigned long val);
-void res_counter_uncharge_until(struct res_counter *counter,
- struct res_counter *top,
- 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
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 3920d593e63c..ff55247e7049 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -86,33 +86,39 @@ int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
return __res_counter_charge(counter, val, limit_fail_at, true);
}
-void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
+u64 res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
{
if (WARN_ON(counter->usage < val))
val = counter->usage;
counter->usage -= val;
+ return counter->usage;
}
-void res_counter_uncharge_until(struct res_counter *counter,
- struct res_counter *top,
- unsigned long val)
+u64 res_counter_uncharge_until(struct res_counter *counter,
+ struct res_counter *top,
+ unsigned long val)
{
unsigned long flags;
struct res_counter *c;
+ u64 ret = 0;
local_irq_save(flags);
for (c = counter; c != top; c = c->parent) {
+ u64 r;
spin_lock(&c->lock);
- res_counter_uncharge_locked(c, val);
+ r = res_counter_uncharge_locked(c, val);
+ if (c == counter)
+ ret = r;
spin_unlock(&c->lock);
}
local_irq_restore(flags);
+ return ret;
}
-void res_counter_uncharge(struct res_counter *counter, unsigned long val)
+u64 res_counter_uncharge(struct res_counter *counter, unsigned long val)
{
- res_counter_uncharge_until(counter, NULL, val);
+ return res_counter_uncharge_until(counter, NULL, val);
}
static inline unsigned long long *