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parisc,metag: Implement CONFIG_DEBUG_STACK_USAGE option 

On parisc and metag the stack grows upwards, so for those we need to
scan the stack downwards in order to calculate how much stack a process
has used.

Tested on a 64bit parisc kernel.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2016-03-19 17:54:10 +01:00
parent 56649be9e6
commit 6c31da3464
2 changed files with 9 additions and 1 deletions
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8
include/linux/sched.h
View File

@ -2870,10 +2870,18 @@ static inline unsigned long stack_not_used(struct task_struct *p)
unsigned long *n = end_of_stack(p);
do { /* Skip over canary */
# ifdef CONFIG_STACK_GROWSUP
n--;
# else
n++;
# endif
} while (!*n);
# ifdef CONFIG_STACK_GROWSUP
return (unsigned long)end_of_stack(p) - (unsigned long)n;
# else
return (unsigned long)n - (unsigned long)end_of_stack(p);
# endif
}
#endif
extern void set_task_stack_end_magic(struct task_struct *tsk);

2
lib/Kconfig.debug
View File

@ -558,7 +558,7 @@ config DEBUG_KMEMLEAK_DEFAULT_OFF
config DEBUG_STACK_USAGE
bool "Stack utilization instrumentation"
depends on DEBUG_KERNEL && !IA64 && !PARISC && !METAG
depends on DEBUG_KERNEL && !IA64
help
Enables the display of the minimum amount of free stack which each
task has ever had available in the sysrq-T and sysrq-P debug output.