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Commit 8501a2fb authored by Eric Sandeen's avatar Eric Sandeen Committed by Linus Torvalds
Browse files

[PATCH] x86_64: x86_64 stack usage debugging 



Applies to git & 2.6.17-rc6 after CONFIG_DEBUG_STACKOVERFLOW patch

uses same stack-zeroing mechanism as on i386 to discover maximum stack
excursions.

Signed-off-by: default avatarEric Sandeen <sandeen@sgi.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 4961f10e

arch/x86_64/Kconfig.debug

+9 −0
Original line number Diff line number Diff line
@@ -42,6 +42,15 @@ config DEBUG_STACKOVERFLOW 
	  This option will cause messages to be printed if free stack space

	  drops below a certain limit.



config DEBUG_STACK_USAGE

        bool "Stack utilization instrumentation"

        depends on DEBUG_KERNEL

        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.



	  This option will slow down process creation somewhat.



#config X86_REMOTE_DEBUG

#       bool "kgdb debugging stub"

include/asm-x86_64/thread_info.h

+13 −0
Original line number Diff line number Diff line
@@ -73,8 +73,21 @@ static inline struct thread_info *stack_thread_info(void) 
}



/* thread information allocation */

#ifdef CONFIG_DEBUG_STACK_USAGE

#define alloc_thread_info(tsk)					\

    ({								\

	struct thread_info *ret;				\

								\

	ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \

	if (ret)						\

		memset(ret, 0, THREAD_SIZE);			\

	ret;							\

    })

#else

#define alloc_thread_info(tsk) \

	((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))

#endif



#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)



#else /* !__ASSEMBLY__ */