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Commit 6c31da34 authored by Helge Deller's avatar Helge Deller
Browse files

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: default avatarHelge Deller <deller@gmx.de>
parent 56649be9

include/linux/sched.h

+8 −0
Original line number Diff line number Diff line
@@ -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);

lib/Kconfig.debug

+1 −1
Original line number Diff line number Diff line
@@ -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.