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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2008-12-23 19:37:01 +0900 |
|---|---|---|
| committer | Pekka Enberg <penberg@cs.helsinki.fi> | 2008-12-29 11:27:46 +0200 |
| commit | 773ff60e841461cb1f9374a713ffcda029b8c317 (patch) | |
| tree | c3691b5a82261a3d2c1861f2913774faac63fa96 /mm/failslab.c | |
| parent | 3c92ec8ae91ecf59d88c798301833d7cf83f2179 (diff) | |
| download | linux-3.10-773ff60e841461cb1f9374a713ffcda029b8c317.tar.gz linux-3.10-773ff60e841461cb1f9374a713ffcda029b8c317.tar.bz2 linux-3.10-773ff60e841461cb1f9374a713ffcda029b8c317.zip | |
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.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/mm/failslab.c b/mm/failslab.c new file mode 100644 index 00000000000..7c6ea6493f8 --- /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 */ |