diff options
| -rw-r--r-- | Documentation/cgroups/resource_counter.txt | 8 | ||||
| -rw-r--r-- | include/linux/res_counter.h | 3 | ||||
| -rw-r--r-- | kernel/res_counter.c | 10 |
3 files changed, 19 insertions, 2 deletions
diff --git a/Documentation/cgroups/resource_counter.txt b/Documentation/cgroups/resource_counter.txt index f3c4ec3626a2..0c4a344e78fa 100644 --- a/Documentation/cgroups/resource_counter.txt +++ b/Documentation/cgroups/resource_counter.txt @@ -92,6 +92,14 @@ to work with it. The _locked routines imply that the res_counter->lock is taken. + f. void res_counter_uncharge_until + (struct res_counter *rc, struct res_counter *top, + unsinged long val) + + Almost same as res_cunter_uncharge() but propagation of uncharge + stops when rc == top. This is useful when kill a res_coutner in + child cgroup. + 2.1 Other accounting routines There are more routines that may help you with common needs, like diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h index fb201896a8b0..5de7a146ead9 100644 --- a/include/linux/res_counter.h +++ b/include/linux/res_counter.h @@ -135,6 +135,9 @@ int __must_check res_counter_charge_nofail(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); +void 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 bebe2b170d49..ad581aa2369a 100644 --- a/kernel/res_counter.c +++ b/kernel/res_counter.c @@ -94,13 +94,15 @@ void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val) counter->usage -= val; } -void 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) { unsigned long flags; struct res_counter *c; local_irq_save(flags); - for (c = counter; c != NULL; c = c->parent) { + for (c = counter; c != top; c = c->parent) { spin_lock(&c->lock); res_counter_uncharge_locked(c, val); spin_unlock(&c->lock); @@ -108,6 +110,10 @@ void res_counter_uncharge(struct res_counter *counter, unsigned long val) local_irq_restore(flags); } +void res_counter_uncharge(struct res_counter *counter, unsigned long val) +{ + res_counter_uncharge_until(counter, NULL, val); +} static inline unsigned long long * res_counter_member(struct res_counter *counter, int member) |