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authorJeff Dike <jdike@addtoit.com>2007-07-16 02:38:48 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 12:05:38 -0400
commite18eecb8b35703a5eea73ee2b45324262029e62c (patch)
tree8c276ae6633b8116ca366274091b00491fd50bbe /kernel
parent84812217e395f5272eac36856c0a2415d61fe139 (diff)
Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/exit.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index ca6a11b73023..64a5263c8c7b 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -858,6 +858,34 @@ static void exit_notify(struct task_struct *tsk)
858 release_task(tsk); 858 release_task(tsk);
859} 859}
860 860
861#ifdef CONFIG_DEBUG_STACK_USAGE
862static void check_stack_usage(void)
863{
864 static DEFINE_SPINLOCK(low_water_lock);
865 static int lowest_to_date = THREAD_SIZE;
866 unsigned long *n = end_of_stack(current);
867 unsigned long free;
868
869 while (*n == 0)
870 n++;
871 free = (unsigned long)n - (unsigned long)end_of_stack(current);
872
873 if (free >= lowest_to_date)
874 return;
875
876 spin_lock(&low_water_lock);
877 if (free < lowest_to_date) {
878 printk(KERN_WARNING "%s used greatest stack depth: %lu bytes "
879 "left\n",
880 current->comm, free);
881 lowest_to_date = free;
882 }
883 spin_unlock(&low_water_lock);
884}
885#else
886static inline void check_stack_usage(void) {}
887#endif
888
861fastcall NORET_TYPE void do_exit(long code) 889fastcall NORET_TYPE void do_exit(long code)
862{ 890{
863 struct task_struct *tsk = current; 891 struct task_struct *tsk = current;
@@ -949,6 +977,7 @@ fastcall NORET_TYPE void do_exit(long code)
949 exit_sem(tsk); 977 exit_sem(tsk);
950 __exit_files(tsk); 978 __exit_files(tsk);
951 __exit_fs(tsk); 979 __exit_fs(tsk);
980 check_stack_usage();
952 exit_thread(); 981 exit_thread();
953 cpuset_exit(tsk); 982 cpuset_exit(tsk);
954 exit_keys(tsk); 983 exit_keys(tsk);