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SLUB: failslab support

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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>
This commit is contained in:
Akinobu Mita
2008-12-23 19:37:01 +09:00
committed by Pekka Enberg
parent 3c92ec8ae9
commit 773ff60e84
6 changed files with 79 additions and 70 deletions
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75
mm/slab.c
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@@ -3106,79 +3106,14 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
#define cache_alloc_debugcheck_after(a,b,objp,d) (objp)
#endif
#ifdef CONFIG_FAILSLAB
static struct failslab_attr {
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,
};
static int __init setup_failslab(char *str)
{
return setup_fault_attr(&failslab.attr, str);
}
__setup("failslab=", setup_failslab);
static int should_failslab(struct kmem_cache *cachep, gfp_t flags)
static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags)
{
if (cachep == &cache_cache)
return 0;
if (flags & __GFP_NOFAIL)
return 0;
if (failslab.ignore_gfp_wait && (flags & __GFP_WAIT))
return 0;
return false;
return should_fail(&failslab.attr, obj_size(cachep));
return should_failslab(obj_size(cachep), flags);
}
#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
static int __init failslab_debugfs(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);
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
#else /* CONFIG_FAILSLAB */
static inline int should_failslab(struct kmem_cache *cachep, gfp_t flags)
{
return 0;
}
#endif /* CONFIG_FAILSLAB */
static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags)
{
void *objp;
@@ -3381,7 +3316,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
unsigned long save_flags;
void *ptr;
if (should_failslab(cachep, flags))
if (slab_should_failslab(cachep, flags))
return NULL;
cache_alloc_debugcheck_before(cachep, flags);
@@ -3457,7 +3392,7 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
unsigned long save_flags;
void *objp;
if (should_failslab(cachep, flags))
if (slab_should_failslab(cachep, flags))
return NULL;
cache_alloc_debugcheck_before(cachep, flags);