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fork: Move memcg_charge_kernel_stack() into CONFIG_VMAP_STACK 

memcg_charge_kernel_stack() is only used in the CONFIG_VMAP_STACK case.

Move memcg_charge_kernel_stack() into the CONFIG_VMAP_STACK block and
invoke it from within alloc_thread_stack_node().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20220217102406.3697941-6-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-17 11:24:03 +01:00 committed by Thomas Gleixner
parent 7865aba3ad
commit f1c1a9ee00
1 changed files with 36 additions and 33 deletions
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69
kernel/fork.c
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@ -211,6 +211,32 @@ static int free_vm_stack_cache(unsigned int cpu)
return 0;
}
static int memcg_charge_kernel_stack(struct task_struct *tsk)
{
struct vm_struct *vm = task_stack_vm_area(tsk);
int i;
int ret;
BUILD_BUG_ON(IS_ENABLED(CONFIG_VMAP_STACK) && PAGE_SIZE % 1024 != 0);
BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE);
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL, 0);
if (ret)
goto err;
}
return 0;
err:
/*
* If memcg_kmem_charge_page() fails, page's memory cgroup pointer is
* NULL, and memcg_kmem_uncharge_page() in free_thread_stack() will
* ignore this page.
*/
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++)
memcg_kmem_uncharge_page(vm->pages[i], 0);
return ret;
}
static int alloc_thread_stack_node(struct task_struct *tsk, int node)
{
void *stack;
@ -230,6 +256,11 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node)
/* Clear stale pointers from reused stack. */
memset(s->addr, 0, THREAD_SIZE);
if (memcg_charge_kernel_stack(tsk)) {
vfree(s->addr);
return -ENOMEM;
}
tsk->stack_vm_area = s;
tsk->stack = s->addr;
return 0;
@ -247,6 +278,11 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node)
0, node, __builtin_return_address(0));
if (!stack)
return -ENOMEM;
if (memcg_charge_kernel_stack(tsk)) {
vfree(stack);
return -ENOMEM;
}
/*
* We can't call find_vm_area() in interrupt context, and
* free_thread_stack() can be called in interrupt context,
@ -418,36 +454,6 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
}
}
static int memcg_charge_kernel_stack(struct task_struct *tsk)
{
#ifdef CONFIG_VMAP_STACK
struct vm_struct *vm = task_stack_vm_area(tsk);
int ret;
BUILD_BUG_ON(IS_ENABLED(CONFIG_VMAP_STACK) && PAGE_SIZE % 1024 != 0);
if (vm) {
int i;
BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE);
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
/*
* If memcg_kmem_charge_page() fails, page's
* memory cgroup pointer is NULL, and
* memcg_kmem_uncharge_page() in free_thread_stack()
* will ignore this page.
*/
ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL,
0);
if (ret)
return ret;
}
}
#endif
return 0;
}
static void release_task_stack(struct task_struct *tsk)
{
if (WARN_ON(READ_ONCE(tsk->__state) != TASK_DEAD))
@ -909,9 +915,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
if (err)
goto free_tsk;
if (memcg_charge_kernel_stack(tsk))
goto free_stack;
#ifdef CONFIG_THREAD_INFO_IN_TASK
refcount_set(&tsk->stack_refcount, 1);
#endif