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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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9
include/linux/fault-inject.h
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@ -81,4 +81,13 @@ static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
#endif /* CONFIG_FAULT_INJECTION */
#ifdef CONFIG_FAILSLAB
extern bool should_failslab(size_t size, gfp_t gfpflags);
#else
static inline bool should_failslab(size_t size, gfp_t gfpflags)
{
return false;
}
#endif /* CONFIG_FAILSLAB */
#endif /* _LINUX_FAULT_INJECT_H */

1
lib/Kconfig.debug
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@ -699,6 +699,7 @@ config FAULT_INJECTION
config FAILSLAB
bool "Fault-injection capability for kmalloc"
depends on FAULT_INJECTION
depends on SLAB || SLUB
help
Provide fault-injection capability for kmalloc.

1
mm/Makefile
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@ -28,6 +28,7 @@ obj-$(CONFIG_SLOB) += slob.o
obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
obj-$(CONFIG_SLAB) += slab.o
obj-$(CONFIG_SLUB) += slub.o
obj-$(CONFIG_FAILSLAB) += failslab.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
obj-$(CONFIG_MIGRATION) += migrate.o

59
mm/failslab.c Normal file
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@ -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 */

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);

4
mm/slub.c
View File

@ -24,6 +24,7 @@
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/math64.h>
#include <linux/fault-inject.h>
/*
* Lock order:
@ -1591,6 +1592,9 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
unsigned long flags;
unsigned int objsize;
if (should_failslab(s->objsize, gfpflags))
return NULL;
local_irq_save(flags);
c = get_cpu_slab(s, smp_processor_id());
objsize = c->objsize;