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Date: Mon, 4 Oct 2010 08:24:15 -0500 (CDT)
From: Christoph Lameter <cl@...ux.com>
To: Pekka Enberg <penberg@...helsinki.fi>
cc: David Rientjes <rientjes@...gle.com>, linux-kernel@...r.kernel.org
Subject: slub: Move functions to reduce #ifdefs
[requires patch to make SYSFS independent from SLUB_DEBUG]
There is a lot of #ifdef/#endifs that can be avoided if functions would be in different
places. Move them around and reduce #ifdef.
Signed-off-by: Christoph Lameter <cl@...ux.com>
---
mm/slub.c | 297 +++++++++++++++++++++++++++++---------------------------------
1 file changed, 141 insertions(+), 156 deletions(-)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2010-10-04 08:17:49.000000000 -0500
+++ linux-2.6/mm/slub.c 2010-10-04 08:18:03.000000000 -0500
@@ -3476,71 +3476,6 @@ static long validate_slab_cache(struct k
kfree(map);
return count;
}
-#endif
-
-#ifdef SLUB_RESILIENCY_TEST
-static void resiliency_test(void)
-{
- u8 *p;
-
- BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || SLUB_PAGE_SHIFT < 10);
-
- printk(KERN_ERR "SLUB resiliency testing\n");
- printk(KERN_ERR "-----------------------\n");
- printk(KERN_ERR "A. Corruption after allocation\n");
-
- p = kzalloc(16, GFP_KERNEL);
- p[16] = 0x12;
- printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer"
- " 0x12->0x%p\n\n", p + 16);
-
- validate_slab_cache(kmalloc_caches[4]);
-
- /* Hmmm... The next two are dangerous */
- p = kzalloc(32, GFP_KERNEL);
- p[32 + sizeof(void *)] = 0x34;
- printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab"
- " 0x34 -> -0x%p\n", p);
- printk(KERN_ERR
- "If allocated object is overwritten then not detectable\n\n");
-
- validate_slab_cache(kmalloc_caches[5]);
- p = kzalloc(64, GFP_KERNEL);
- p += 64 + (get_cycles() & 0xff) * sizeof(void *);
- *p = 0x56;
- printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
- p);
- printk(KERN_ERR
- "If allocated object is overwritten then not detectable\n\n");
- validate_slab_cache(kmalloc_caches[6]);
-
- printk(KERN_ERR "\nB. Corruption after free\n");
- p = kzalloc(128, GFP_KERNEL);
- kfree(p);
- *p = 0x78;
- printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p);
- validate_slab_cache(kmalloc_caches[7]);
-
- p = kzalloc(256, GFP_KERNEL);
- kfree(p);
- p[50] = 0x9a;
- printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n",
- p);
- validate_slab_cache(kmalloc_caches[8]);
-
- p = kzalloc(512, GFP_KERNEL);
- kfree(p);
- p[512] = 0xab;
- printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p);
- validate_slab_cache(kmalloc_caches[9]);
-}
-#else
-#ifdef CONFIG_SYSFS
-static void resiliency_test(void) {};
-#endif
-#endif
-
-#ifdef CONFIG_DEBUG
/*
* Generate lists of code addresses where slabcache objects are allocated
* and freed.
@@ -3771,6 +3706,68 @@ static int list_locations(struct kmem_ca
}
#endif
+#ifdef SLUB_RESILIENCY_TEST
+static void resiliency_test(void)
+{
+ u8 *p;
+
+ BUILD_BUG_ON(KMALLOC_MIN_SIZE > 16 || SLUB_PAGE_SHIFT < 10);
+
+ printk(KERN_ERR "SLUB resiliency testing\n");
+ printk(KERN_ERR "-----------------------\n");
+ printk(KERN_ERR "A. Corruption after allocation\n");
+
+ p = kzalloc(16, GFP_KERNEL);
+ p[16] = 0x12;
+ printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer"
+ " 0x12->0x%p\n\n", p + 16);
+
+ validate_slab_cache(kmalloc_caches[4]);
+
+ /* Hmmm... The next two are dangerous */
+ p = kzalloc(32, GFP_KERNEL);
+ p[32 + sizeof(void *)] = 0x34;
+ printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab"
+ " 0x34 -> -0x%p\n", p);
+ printk(KERN_ERR
+ "If allocated object is overwritten then not detectable\n\n");
+
+ validate_slab_cache(kmalloc_caches[5]);
+ p = kzalloc(64, GFP_KERNEL);
+ p += 64 + (get_cycles() & 0xff) * sizeof(void *);
+ *p = 0x56;
+ printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
+ p);
+ printk(KERN_ERR
+ "If allocated object is overwritten then not detectable\n\n");
+ validate_slab_cache(kmalloc_caches[6]);
+
+ printk(KERN_ERR "\nB. Corruption after free\n");
+ p = kzalloc(128, GFP_KERNEL);
+ kfree(p);
+ *p = 0x78;
+ printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p);
+ validate_slab_cache(kmalloc_caches[7]);
+
+ p = kzalloc(256, GFP_KERNEL);
+ kfree(p);
+ p[50] = 0x9a;
+ printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n",
+ p);
+ validate_slab_cache(kmalloc_caches[8]);
+
+ p = kzalloc(512, GFP_KERNEL);
+ kfree(p);
+ p[512] = 0xab;
+ printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p);
+ validate_slab_cache(kmalloc_caches[9]);
+}
+#else
+#ifdef CONFIG_SYSFS
+static void resiliency_test(void) {};
+#endif
+#endif
+
#ifdef CONFIG_SYSFS
enum slab_stat_type {
SL_ALL, /* All slabs */
@@ -3987,14 +3984,6 @@ static ssize_t aliases_show(struct kmem_
}
SLAB_ATTR_RO(aliases);
-#ifdef CONFIG_SLUB_DEBUG
-static ssize_t slabs_show(struct kmem_cache *s, char *buf)
-{
- return show_slab_objects(s, buf, SO_ALL);
-}
-SLAB_ATTR_RO(slabs);
-#endif
-
static ssize_t partial_show(struct kmem_cache *s, char *buf)
{
return show_slab_objects(s, buf, SO_PARTIAL);
@@ -4019,7 +4008,48 @@ static ssize_t objects_partial_show(stru
}
SLAB_ATTR_RO(objects_partial);
+static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT));
+}
+
+static ssize_t reclaim_account_store(struct kmem_cache *s,
+ const char *buf, size_t length)
+{
+ s->flags &= ~SLAB_RECLAIM_ACCOUNT;
+ if (buf[0] == '1')
+ s->flags |= SLAB_RECLAIM_ACCOUNT;
+ return length;
+}
+SLAB_ATTR(reclaim_account);
+
+static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN));
+}
+SLAB_ATTR_RO(hwcache_align);
+
+#ifdef CONFIG_ZONE_DMA
+static ssize_t cache_dma_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA));
+}
+SLAB_ATTR_RO(cache_dma);
+#endif
+
+static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU));
+}
+SLAB_ATTR_RO(destroy_by_rcu);
+
#ifdef CONFIG_SLUB_DEBUG
+static ssize_t slabs_show(struct kmem_cache *s, char *buf)
+{
+ return show_slab_objects(s, buf, SO_ALL);
+}
+SLAB_ATTR_RO(slabs);
+
static ssize_t total_objects_show(struct kmem_cache *s, char *buf)
{
return show_slab_objects(s, buf, SO_ALL|SO_TOTAL);
@@ -4056,60 +4086,6 @@ static ssize_t trace_store(struct kmem_c
}
SLAB_ATTR(trace);
-#ifdef CONFIG_FAILSLAB
-static ssize_t failslab_show(struct kmem_cache *s, char *buf)
-{
- return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB));
-}
-
-static ssize_t failslab_store(struct kmem_cache *s, const char *buf,
- size_t length)
-{
- s->flags &= ~SLAB_FAILSLAB;
- if (buf[0] == '1')
- s->flags |= SLAB_FAILSLAB;
- return length;
-}
-SLAB_ATTR(failslab);
-#endif
-#endif
-
-static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf)
-{
- return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT));
-}
-
-static ssize_t reclaim_account_store(struct kmem_cache *s,
- const char *buf, size_t length)
-{
- s->flags &= ~SLAB_RECLAIM_ACCOUNT;
- if (buf[0] == '1')
- s->flags |= SLAB_RECLAIM_ACCOUNT;
- return length;
-}
-SLAB_ATTR(reclaim_account);
-
-static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf)
-{
- return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN));
-}
-SLAB_ATTR_RO(hwcache_align);
-
-#ifdef CONFIG_ZONE_DMA
-static ssize_t cache_dma_show(struct kmem_cache *s, char *buf)
-{
- return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA));
-}
-SLAB_ATTR_RO(cache_dma);
-#endif
-
-static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf)
-{
- return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU));
-}
-SLAB_ATTR_RO(destroy_by_rcu);
-
-#ifdef CONFIG_SLUB_DEBUG
static ssize_t red_zone_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE));
@@ -4185,6 +4161,39 @@ static ssize_t validate_store(struct kme
return ret;
}
SLAB_ATTR(validate);
+
+static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf)
+{
+ if (!(s->flags & SLAB_STORE_USER))
+ return -ENOSYS;
+ return list_locations(s, buf, TRACK_ALLOC);
+}
+SLAB_ATTR_RO(alloc_calls);
+
+static ssize_t free_calls_show(struct kmem_cache *s, char *buf)
+{
+ if (!(s->flags & SLAB_STORE_USER))
+ return -ENOSYS;
+ return list_locations(s, buf, TRACK_FREE);
+}
+SLAB_ATTR_RO(free_calls);
+#endif /* CONFIG_SLUB_DEBUG */
+
+#ifdef CONFIG_FAILSLAB
+static ssize_t failslab_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB));
+}
+
+static ssize_t failslab_store(struct kmem_cache *s, const char *buf,
+ size_t length)
+{
+ s->flags &= ~SLAB_FAILSLAB;
+ if (buf[0] == '1')
+ s->flags |= SLAB_FAILSLAB;
+ return length;
+}
+SLAB_ATTR(failslab);
#endif
static ssize_t shrink_show(struct kmem_cache *s, char *buf)
@@ -4206,24 +4215,6 @@ static ssize_t shrink_store(struct kmem_
}
SLAB_ATTR(shrink);
-#ifdef CONFIG_SLUB_DEBUG
-static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf)
-{
- if (!(s->flags & SLAB_STORE_USER))
- return -ENOSYS;
- return list_locations(s, buf, TRACK_ALLOC);
-}
-SLAB_ATTR_RO(alloc_calls);
-
-static ssize_t free_calls_show(struct kmem_cache *s, char *buf)
-{
- if (!(s->flags & SLAB_STORE_USER))
- return -ENOSYS;
- return list_locations(s, buf, TRACK_FREE);
-}
-SLAB_ATTR_RO(free_calls);
-#endif
-
#ifdef CONFIG_NUMA
static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf)
{
@@ -4329,30 +4320,24 @@ static struct attribute *slab_attrs[] =
&min_partial_attr.attr,
&objects_attr.attr,
&objects_partial_attr.attr,
-#ifdef CONFIG_SLUB_DEBUG
- &total_objects_attr.attr,
- &slabs_attr.attr,
-#endif
&partial_attr.attr,
&cpu_slabs_attr.attr,
&ctor_attr.attr,
&aliases_attr.attr,
&align_attr.attr,
-#ifdef CONFIG_SLUB_DEBUG
- &sanity_checks_attr.attr,
- &trace_attr.attr,
-#endif
&hwcache_align_attr.attr,
&reclaim_account_attr.attr,
&destroy_by_rcu_attr.attr,
+ &shrink_attr.attr,
#ifdef CONFIG_SLUB_DEBUG
+ &total_objects_attr.attr,
+ &slabs_attr.attr,
+ &sanity_checks_attr.attr,
+ &trace_attr.attr,
&red_zone_attr.attr,
&poison_attr.attr,
&store_user_attr.attr,
&validate_attr.attr,
-#endif
- &shrink_attr.attr,
-#ifdef CONFIG_SLUB_DEBUG
&alloc_calls_attr.attr,
&free_calls_attr.attr,
#endif
--
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