Peter Zijlstra has recently demonstrated that we can have order 1 allocation failures under memory pressure with small memory configurations. The x86_64 stack has a size of 8k and thus requires a order 1 allocation. This patch adds a virtual fallback capability for the stack. The system may continue even in extreme situations and we may be able to increase the stack size if necessary (see next patch). Cc: ak@suse.de Cc: travis@sgi.com Signed-off-by: Christoph Lameter --- include/asm-x86_64/thread_info.h | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) Index: linux-2.6/include/asm-x86_64/thread_info.h =================================================================== --- linux-2.6.orig/include/asm-x86_64/thread_info.h 2007-10-03 14:49:48.000000000 -0700 +++ linux-2.6/include/asm-x86_64/thread_info.h 2007-10-03 14:51:00.000000000 -0700 @@ -74,20 +74,14 @@ static inline struct thread_info *stack_ /* 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; \ - }) +#define THREAD_FLAGS (GFP_VFALLBACK | __GFP_ZERO) #else -#define alloc_thread_info(tsk) \ - ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)) +#define THREAD_FLAGS GFP_VFALLBACK #endif +#define alloc_thread_info(tsk) \ + ((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER)) + #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER) #else /* !__ASSEMBLY__ */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/