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-rw-r--r--include/linux/res_counter.h8
-rw-r--r--kernel/res_counter.c44
-rw-r--r--mm/memcontrol.c20
3 files changed, 54 insertions, 18 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 271c1c2..dede0a2 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -43,6 +43,10 @@ struct res_counter {
* the routines below consider this to be IRQ-safe
*/
spinlock_t lock;
+ /*
+ * Parent counter, used for hierarchial resource accounting
+ */
+ struct res_counter *parent;
};
/**
@@ -87,7 +91,7 @@ enum {
* helpers for accounting
*/
-void res_counter_init(struct res_counter *counter);
+void res_counter_init(struct res_counter *counter, struct res_counter *parent);
/*
* charge - try to consume more resource.
@@ -103,7 +107,7 @@ void res_counter_init(struct res_counter *counter);
int __must_check res_counter_charge_locked(struct res_counter *counter,
unsigned long val);
int __must_check res_counter_charge(struct res_counter *counter,
- unsigned long val);
+ unsigned long val, struct res_counter **limit_fail_at);
/*
* uncharge - tell that some portion of the resource is released
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index f275c8e..bf8e753 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -15,10 +15,11 @@
#include <linux/uaccess.h>
#include <linux/mm.h>
-void res_counter_init(struct res_counter *counter)
+void res_counter_init(struct res_counter *counter, struct res_counter *parent)
{
spin_lock_init(&counter->lock);
counter->limit = (unsigned long long)LLONG_MAX;
+ counter->parent = parent;
}
int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
@@ -34,14 +35,34 @@ int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
return 0;
}
-int res_counter_charge(struct res_counter *counter, unsigned long val)
+int res_counter_charge(struct res_counter *counter, unsigned long val,
+ struct res_counter **limit_fail_at)
{
int ret;
unsigned long flags;
-
- spin_lock_irqsave(&counter->lock, flags);
- ret = res_counter_charge_locked(counter, val);
- spin_unlock_irqrestore(&counter->lock, flags);
+ struct res_counter *c, *u;
+
+ *limit_fail_at = NULL;
+ local_irq_save(flags);
+ for (c = counter; c != NULL; c = c->parent) {
+ spin_lock(&c->lock);
+ ret = res_counter_charge_locked(c, val);
+ spin_unlock(&c->lock);
+ if (ret < 0) {
+ *limit_fail_at = c;
+ goto undo;
+ }
+ }
+ ret = 0;
+ goto done;
+undo:
+ for (u = counter; u != c; u = u->parent) {
+ spin_lock(&u->lock);
+ res_counter_uncharge_locked(u, val);
+ spin_unlock(&u->lock);
+ }
+done:
+ local_irq_restore(flags);
return ret;
}
@@ -56,10 +77,15 @@ void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
void res_counter_uncharge(struct res_counter *counter, unsigned long val)
{
unsigned long flags;
+ struct res_counter *c;
- spin_lock_irqsave(&counter->lock, flags);
- res_counter_uncharge_locked(counter, val);
- spin_unlock_irqrestore(&counter->lock, flags);
+ local_irq_save(flags);
+ for (c = counter; c != NULL; c = c->parent) {
+ spin_lock(&c->lock);
+ res_counter_uncharge_locked(c, val);
+ spin_unlock(&c->lock);
+ }
+ local_irq_restore(flags);
}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9846f61..e72fb2b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -471,6 +471,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
{
struct mem_cgroup *mem;
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
+ struct res_counter *fail_res;
/*
* We always charge the cgroup the mm_struct belongs to.
* The mm_struct's mem_cgroup changes on task migration if the
@@ -499,11 +500,12 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
int ret;
bool noswap = false;
- ret = res_counter_charge(&mem->res, PAGE_SIZE);
+ ret = res_counter_charge(&mem->res, PAGE_SIZE, &fail_res);
if (likely(!ret)) {
if (!do_swap_account)
break;
- ret = res_counter_charge(&mem->memsw, PAGE_SIZE);
+ ret = res_counter_charge(&mem->memsw, PAGE_SIZE,
+ &fail_res);
if (likely(!ret))
break;
/* mem+swap counter fails */
@@ -1709,22 +1711,26 @@ static void __init enable_swap_cgroup(void)
static struct cgroup_subsys_state *
mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
{
- struct mem_cgroup *mem;
+ struct mem_cgroup *mem, *parent;
int node;
mem = mem_cgroup_alloc();
if (!mem)
return ERR_PTR(-ENOMEM);
- res_counter_init(&mem->res);
- res_counter_init(&mem->memsw);
-
for_each_node_state(node, N_POSSIBLE)
if (alloc_mem_cgroup_per_zone_info(mem, node))
goto free_out;
/* root ? */
- if (cont->parent == NULL)
+ if (cont->parent == NULL) {
enable_swap_cgroup();
+ parent = NULL;
+ } else
+ parent = mem_cgroup_from_cont(cont->parent);
+
+ res_counter_init(&mem->res, parent ? &parent->res : NULL);
+ res_counter_init(&mem->memsw, parent ? &parent->memsw : NULL);
+
return &mem->css;
free_out:
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