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On Sun, Aug 13, 2006 at 06:22:19PM +0800, Akinobu Mita wrote: > The idea behind failslab is to demonstrate what really happens if > slab allocation fails. The idea of failslab is completely taken > from failmalloc (http://www.nongnu.org/failmalloc/). I have similar versions for vmalloc() and page_alloc(). But I couldn't find outstanding bugs. boot options: failvmalloc=<probability>,<interval>,<times>,<space> fail_page_alloc=<probability>,<interval>,<times>,<space> Index: work-failmalloc/mm/vmalloc.c =================================================================== --- work-failmalloc.orig/mm/vmalloc.c +++ work-failmalloc/mm/vmalloc.c @@ -16,6 +16,7 @@ #include <linux/interrupt.h> #include <linux/vmalloc.h> +#include <linux/failmalloc.h> #include <asm/uaccess.h> #include <asm/tlbflush.h> @@ -416,12 +417,28 @@ void *vmap(struct page **pages, unsigned } EXPORT_SYMBOL(vmap); +#ifdef CONFIG_FAILMALLOC + +struct failmalloc_data failvmalloc; + +static int __init setup_failvmalloc(char *str) +{ + return setup_failmalloc(&failvmalloc, str); +} + +__setup("failvmalloc=", setup_failvmalloc); + +#endif + void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot, int node) { struct page **pages; unsigned int nr_pages, array_size, i; + if (!(gfp_mask & __GFP_NOFAIL) && should_fail(&failvmalloc, area->size)) + goto fail; + nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT; array_size = (nr_pages * sizeof(struct page *)); Index: work-failmalloc/mm/page_alloc.c =================================================================== --- work-failmalloc.orig/mm/page_alloc.c +++ work-failmalloc/mm/page_alloc.c @@ -37,6 +37,7 @@ #include <linux/vmalloc.h> #include <linux/mempolicy.h> #include <linux/stop_machine.h> +#include <linux/failmalloc.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -903,6 +904,19 @@ get_page_from_freelist(gfp_t gfp_mask, u return page; } +#ifdef CONFIG_FAILMALLOC + +struct failmalloc_data fail_page_alloc; + +static int __init setup_fail_page_alloc(char *str) +{ + return setup_failmalloc(&fail_page_alloc, str); +} + +__setup("fail_page_alloc=", setup_fail_page_alloc); + +#endif + /* * This is the 'heart' of the zoned buddy allocator. */ @@ -921,6 +935,10 @@ __alloc_pages(gfp_t gfp_mask, unsigned i might_sleep_if(wait); + if (!(gfp_mask & __GFP_NOFAIL) && + should_fail(&fail_page_alloc, PAGE_SIZE << order)) + return NULL; + restart: z = zonelist->zones; /* the list of zones suitable for gfp_mask */ - 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/ | ||||||||||
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