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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); unsigned long *n = end_of_stack(p);
do { /* Skip over canary */ do { /* Skip over canary */
# ifdef CONFIG_STACK_GROWSUP
n--;
# else
n++; n++;
# endif
} while (!*n); } 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); return (unsigned long)n - (unsigned long)end_of_stack(p);
# endif
} }
#endif #endif
extern void set_task_stack_end_magic(struct task_struct *tsk); 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 config DEBUG_STACK_USAGE
bool "Stack utilization instrumentation" bool "Stack utilization instrumentation"
depends on DEBUG_KERNEL && !IA64 && !PARISC && !METAG depends on DEBUG_KERNEL && !IA64
help help
Enables the display of the minimum amount of free stack which each 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. task has ever had available in the sysrq-T and sysrq-P debug output.