This patch provides fault-injection capability for alloc_pages()
Boot option:
fail_page_alloc=<interval>,<probability>,<space>,<times>
<interval> -- specifies the interval of failures.
<probability> -- specifies how often it should fail in percent.
<space> -- specifies the size of free space where memory can be
allocated safely in pages.
<times> -- specifies how many times failures may happen at most.
Example:
fail_page_alloc=10,100,0,-1
The page allocation (alloc_pages(), ...) fails once per 10 times.
Signed-off-by: Akinobu Mita <[email protected]>
include/linux/fault-inject.h | 3 +++
lib/Kconfig.debug | 7 +++++++
mm/page_alloc.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+)
Index: work-shouldfail/lib/Kconfig.debug
===================================================================
--- work-shouldfail.orig/lib/Kconfig.debug
+++ work-shouldfail/lib/Kconfig.debug
@@ -379,3 +379,10 @@ config FAILSLAB
help
This option provides fault-injection capabilitiy for kmalloc.
+config FAIL_PAGE_ALLOC
+ bool "fault-injection capabilitiy for alloc_pages()"
+ depends on DEBUG_KERNEL
+ select FAULT_INJECTION
+ help
+ This option provides fault-injection capabilitiy for alloc_pages().
+
Index: work-shouldfail/mm/page_alloc.c
===================================================================
--- work-shouldfail.orig/mm/page_alloc.c
+++ work-shouldfail/mm/page_alloc.c
@@ -37,6 +37,7 @@
#include <linux/vmalloc.h>
#include <linux/mempolicy.h>
#include <linux/stop_machine.h>
+#include <linux/fault-inject.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@@ -903,6 +904,37 @@ get_page_from_freelist(gfp_t gfp_mask, u
return page;
}
+#ifdef CONFIG_FAIL_PAGE_ALLOC
+
+static DEFINE_FAULT_ATTR(fail_page_alloc_attr);
+
+static int __init setup_fail_page_alloc(char *str)
+{
+ should_fail_srandom(jiffies);
+ return setup_fault_attr(&fail_page_alloc_attr, str);
+}
+__setup("fail_page_alloc=", setup_fail_page_alloc);
+
+struct fault_attr *fail_page_alloc = &fail_page_alloc_attr;
+EXPORT_SYMBOL_GPL(fail_page_alloc);
+
+static int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
+{
+ if (gfp_mask & __GFP_NOFAIL)
+ return 0;
+
+ return should_fail(fail_page_alloc, 1 << order);
+}
+
+#else
+
+static inline int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
+{
+ return 0;
+}
+
+#endif
+
/*
* This is the 'heart' of the zoned buddy allocator.
*/
@@ -921,6 +953,9 @@ __alloc_pages(gfp_t gfp_mask, unsigned i
might_sleep_if(wait);
+ if (should_fail_alloc_page(gfp_mask, order))
+ return NULL;
+
restart:
z = zonelist->zones; /* the list of zones suitable for gfp_mask */
Index: work-shouldfail/include/linux/fault-inject.h
===================================================================
--- work-shouldfail.orig/include/linux/fault-inject.h
+++ work-shouldfail/include/linux/fault-inject.h
@@ -39,6 +39,9 @@ int should_fail(struct fault_attr *attr,
#ifdef CONFIG_FAILSLAB
extern struct fault_attr *failslab;
#endif
+#ifdef CONFIG_FAIL_PAGE_ALLOC
+extern struct fault_attr *fail_page_alloc;
+#endif
#endif /* CONFIG_FAULT_INJECTION */
--
-
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