This function is used for moving accounting information to its
parent in the hierarchy of res_counter.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
include/linux/res_counter.h | 3 +++
kernel/res_counter.c | 13 +++++++++++++
2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index da81af0..8919d3c 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);
+/* move resource to parent counter...i.e. just forget accounting in a child */
+void res_counter_move_parent(struct res_counter *counter, 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 d508363..fafebf0 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -113,6 +113,19 @@ void res_counter_uncharge(struct res_counter *counter, unsigned long val)
local_irq_restore(flags);
}
+/*
+ * In hierarchical accounting, child's usage is accounted into ancestors.
+ * To move local usage to its parent, just forget current level usage.
+ */
+void res_counter_move_parent(struct res_counter *counter, unsigned long val)
+{
+ unsigned long flags;
+
+ BUG_ON(!counter->parent);
+ spin_lock_irqsave(&counter->lock, flags);
+ res_counter_uncharge_locked(counter, val);
+ spin_unlock_irqrestore(&counter->lock, flags);
+}
static inline unsigned long long *
res_counter_member(struct res_counter *counter, int member)
--
1.7.4.1
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