diff options
| -rw-r--r-- | arch/x86_64/Kconfig.debug | 9 | ||||
| -rw-r--r-- | include/asm-x86_64/thread_info.h | 13 |
2 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86_64/Kconfig.debug b/arch/x86_64/Kconfig.debug index 087a04868b25..1d92ab56c0f9 100644 --- a/arch/x86_64/Kconfig.debug +++ b/arch/x86_64/Kconfig.debug @@ -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" diff --git a/include/asm-x86_64/thread_info.h b/include/asm-x86_64/thread_info.h index b5e88216fd80..2029b00351f3 100644 --- a/include/asm-x86_64/thread_info.h +++ b/include/asm-x86_64/thread_info.h @@ -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__ */ |