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fork: Move task stack accounting to do_exit()

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There is no need to perform the stack accounting of the outgoing task in
its final schedule() invocation which happens with preemption disabled.
The task is leaving, the resources will be freed and the accounting can
happen in do_exit() before the actual schedule invocation which
frees the stack memory.

Move the accounting of the stack memory from release_task_stack() to
exit_task_stack_account() which then can be invoked from do_exit().

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/20220217102406.3697941-7-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-17 11:24:04 +01:00 committed by Thomas Gleixner
parent f1c1a9ee00
commit 1a03d3f13f
3 changed files with 26 additions and 12 deletions
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2
include/linux/sched/task_stack.h
View file

@ -79,6 +79,8 @@ static inline void *try_get_task_stack(struct task_struct *tsk)
static inline void put_task_stack(struct task_struct *tsk) {}
#endif
void exit_task_stack_account(struct task_struct *tsk);
#define task_stack_end_corrupted(task) \
(*(end_of_stack(task)) != STACK_END_MAGIC)

1
kernel/exit.c
View file

@ -845,6 +845,7 @@ void __noreturn do_exit(long code)
put_page(tsk->task_frag.page);
validate_creds_for_do_exit(tsk);
exit_task_stack_account(tsk);
check_stack_usage();
preempt_disable();

35
kernel/fork.c
View file

@ -211,9 +211,8 @@ static int free_vm_stack_cache(unsigned int cpu)
return 0;
}
static int memcg_charge_kernel_stack(struct task_struct *tsk)
static int memcg_charge_kernel_stack(struct vm_struct *vm)
{
struct vm_struct *vm = task_stack_vm_area(tsk);
int i;
int ret;
@ -239,6 +238,7 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk)
static int alloc_thread_stack_node(struct task_struct *tsk, int node)
{
struct vm_struct *vm;
void *stack;
int i;
@ -256,7 +256,7 @@ 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)) {
if (memcg_charge_kernel_stack(s)) {
vfree(s->addr);
return -ENOMEM;
}
@ -279,7 +279,8 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node)
if (!stack)
return -ENOMEM;
if (memcg_charge_kernel_stack(tsk)) {
vm = find_vm_area(stack);
if (memcg_charge_kernel_stack(vm)) {
vfree(stack);
return -ENOMEM;
}
@ -288,19 +289,15 @@ static int alloc_thread_stack_node(struct task_struct *tsk, int node)
* free_thread_stack() can be called in interrupt context,
* so cache the vm_struct.
*/
tsk->stack_vm_area = find_vm_area(stack);
tsk->stack_vm_area = vm;
tsk->stack = stack;
return 0;
}
static void free_thread_stack(struct task_struct *tsk)
{
struct vm_struct *vm = task_stack_vm_area(tsk);
int i;
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++)
memcg_kmem_uncharge_page(vm->pages[i], 0);
for (i = 0; i < NR_CACHED_STACKS; i++) {
if (this_cpu_cmpxchg(cached_stacks[i], NULL,
tsk->stack_vm_area) != NULL)
@ -454,12 +451,25 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
}
}
void exit_task_stack_account(struct task_struct *tsk)
{
account_kernel_stack(tsk, -1);
if (IS_ENABLED(CONFIG_VMAP_STACK)) {
struct vm_struct *vm;
int i;
vm = task_stack_vm_area(tsk);
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++)
memcg_kmem_uncharge_page(vm->pages[i], 0);
}
}
static void release_task_stack(struct task_struct *tsk)
{
if (WARN_ON(READ_ONCE(tsk->__state) != TASK_DEAD))
return; /* Better to leak the stack than to free prematurely */
account_kernel_stack(tsk, -1);
free_thread_stack(tsk);
}
@ -918,6 +928,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
#ifdef CONFIG_THREAD_INFO_IN_TASK
refcount_set(&tsk->stack_refcount, 1);
#endif
account_kernel_stack(tsk, 1);
err = scs_prepare(tsk, node);
if (err)
@ -961,8 +972,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
tsk->wake_q.next = NULL;
tsk->worker_private = NULL;
account_kernel_stack(tsk, 1);
kcov_task_init(tsk);
kmap_local_fork(tsk);
@ -981,6 +990,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
return tsk;
free_stack:
exit_task_stack_account(tsk);
free_thread_stack(tsk);
free_tsk:
free_task_struct(tsk);
@ -2459,6 +2469,7 @@ static __latent_entropy struct task_struct *copy_process(
exit_creds(p);
bad_fork_free:
WRITE_ONCE(p->__state, TASK_DEAD);
exit_task_stack_account(p);
put_task_stack(p);
delayed_free_task(p);
fork_out: