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authorAkinobu Mita <akinobu.mita@gmail.com>2008-12-23 19:37:01 +0900
committerPekka Enberg <penberg@cs.helsinki.fi>2008-12-29 11:27:46 +0200
commit773ff60e841461cb1f9374a713ffcda029b8c317 (patch)
treec3691b5a82261a3d2c1861f2913774faac63fa96 /mm/failslab.c
parent3c92ec8ae91ecf59d88c798301833d7cf83f2179 (diff)
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SLUB: failslab support
Currently fault-injection capability for SLAB allocator is only available to SLAB. This patch makes it available to SLUB, too. [penberg@cs.helsinki.fi: unify slab and slub implementations] Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'mm/failslab.c')
-rw-r--r--mm/failslab.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/mm/failslab.c b/mm/failslab.c
new file mode 100644
index 000000000000..7c6ea6493f80
--- /dev/null
+++ b/mm/failslab.c
@@ -0,0 +1,59 @@
+#include <linux/fault-inject.h>
+
+static struct {
+ struct fault_attr attr;
+ u32 ignore_gfp_wait;
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+ struct dentry *ignore_gfp_wait_file;
+#endif
+} failslab = {
+ .attr = FAULT_ATTR_INITIALIZER,
+ .ignore_gfp_wait = 1,
+};
+
+bool should_failslab(size_t size, gfp_t gfpflags)
+{
+ if (gfpflags & __GFP_NOFAIL)
+ return false;
+
+ if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
+ return false;
+
+ return should_fail(&failslab.attr, size);
+}
+
+static int __init setup_failslab(char *str)
+{
+ return setup_fault_attr(&failslab.attr, str);
+}
+__setup("failslab=", setup_failslab);
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+static int __init failslab_debugfs_init(void)
+{
+ mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+ struct dentry *dir;
+ int err;
+
+ err = init_fault_attr_dentries(&failslab.attr, "failslab");
+ if (err)
+ return err;
+ dir = failslab.attr.dentries.dir;
+
+ failslab.ignore_gfp_wait_file =
+ debugfs_create_bool("ignore-gfp-wait", mode, dir,
+ &failslab.ignore_gfp_wait);
+
+ if (!failslab.ignore_gfp_wait_file) {
+ err = -ENOMEM;
+ debugfs_remove(failslab.ignore_gfp_wait_file);
+ cleanup_fault_attr_dentries(&failslab.attr);
+ }
+
+ return err;
+}
+
+late_initcall(failslab_debugfs_init);
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */