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Date: Tue, 23 Dec 2008 19:37:01 +0900
From: Akinobu Mita <akinobu.mita@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Christoph Lameter <cl@...ux-foundation.org>,
Pekka Enberg <penberg@...helsinki.fi>,
Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
akpm@...ux-foundation.org
Subject: [PATCH] failslab for SLUB
Currently fault-injection capability for SLAB allocator is only available
to SLAB. This patch makes it available to SLUB, too.
Cc: Christoph Lameter <cl@...ux-foundation.org>
Cc: Pekka Enberg <penberg@...helsinki.fi>
Cc: Matt Mackall <mpm@...enic.com>
Cc: linux-mm@...ck.org
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
---
lib/Kconfig.debug | 1
mm/slub.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)
Index: 2.6-rc/mm/slub.c
===================================================================
--- 2.6-rc.orig/mm/slub.c
+++ 2.6-rc/mm/slub.c
@@ -24,6 +24,7 @@
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/math64.h>
+#include <linux/fault-inject.h>
/*
* Lock order:
@@ -1573,6 +1574,68 @@ debug:
goto unlock_out;
}
+#ifdef CONFIG_FAILSLAB
+
+static struct {
+ struct fault_attr attr;
+ u32 ignore_gfp_wait;
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+ struct dentry *ignore_gfp_wait_file;
+#endif
+} failslub = {
+ .attr = FAULT_ATTR_INITIALIZER,
+ .ignore_gfp_wait = 1,
+};
+
+static bool should_failslub(struct kmem_cache *s, gfp_t gfpflags)
+{
+ if (gfpflags & __GFP_NOFAIL)
+ return false;
+ if (failslub.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
+ return false;
+
+ return should_fail(&failslub.attr, s->objsize);
+}
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+static int __init failslub_debugfs(void)
+{
+ mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+ struct dentry *dir;
+ int err;
+
+ err = init_fault_attr_dentries(&failslub.attr, "failslab");
+ if (err)
+ return err;
+ dir = failslub.attr.dentries.dir;
+
+ failslub.ignore_gfp_wait_file =
+ debugfs_create_bool("ignore-gfp-wait", mode, dir,
+ &failslub.ignore_gfp_wait);
+
+ if (!failslub.ignore_gfp_wait_file) {
+ err = -ENOMEM;
+ debugfs_remove(failslub.ignore_gfp_wait_file);
+ cleanup_fault_attr_dentries(&failslub.attr);
+ }
+
+ return err;
+}
+
+late_initcall(failslub_debugfs);
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
+
+#else /* CONFIG_FAILSLAB */
+
+static inline bool should_failslub(struct kmem_cache *cachep, gfp_t flags)
+{
+ return false;
+}
+
+#endif /* CONFIG_FAILSLAB */
+
/*
* Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc)
* have the fastpath folded into their functions. So no function call
@@ -1591,6 +1654,9 @@ static __always_inline void *slab_alloc(
unsigned long flags;
unsigned int objsize;
+ if (should_failslub(s, gfpflags))
+ return NULL;
+
local_irq_save(flags);
c = get_cpu_slab(s, smp_processor_id());
objsize = c->objsize;
Index: 2.6-rc/lib/Kconfig.debug
===================================================================
--- 2.6-rc.orig/lib/Kconfig.debug
+++ 2.6-rc/lib/Kconfig.debug
@@ -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.
--
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