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Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE

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Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE.

This also adds UML support.

Tested on UML and i386.

[akpm@linux-foundation.org: cleanups, speedups, tweaks]
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-07-15 23:38:48 -07:00 • committed by Linus Torvalds
parent 84812217e3
commit e18eecb8b3
4 changed files with 48 additions and 0 deletions
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29
kernel/exit.c
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@ -858,6 +858,34 @@ static void exit_notify(struct task_struct *tsk)
release_task(tsk);
}
#ifdef CONFIG_DEBUG_STACK_USAGE
static void check_stack_usage(void)
{
static DEFINE_SPINLOCK(low_water_lock);
static int lowest_to_date = THREAD_SIZE;
unsigned long *n = end_of_stack(current);
unsigned long free;
while (*n == 0)
n++;
free = (unsigned long)n - (unsigned long)end_of_stack(current);
if (free >= lowest_to_date)
return;
spin_lock(&low_water_lock);
if (free < lowest_to_date) {
printk(KERN_WARNING "%s used greatest stack depth: %lu bytes "
"left\n",
current->comm, free);
lowest_to_date = free;
}
spin_unlock(&low_water_lock);
}
#else
static inline void check_stack_usage(void) {}
#endif
fastcall NORET_TYPE void do_exit(long code)
{
struct task_struct *tsk = current;
@ -949,6 +977,7 @@ fastcall NORET_TYPE void do_exit(long code)
exit_sem(tsk);
__exit_files(tsk);
__exit_fs(tsk);
check_stack_usage();
exit_thread();
cpuset_exit(tsk);
exit_keys(tsk);