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authorRichard Kennedy <richard@rsk.demon.co.uk>2010-10-21 13:29:19 +0400
committerPekka Enberg <penberg@kernel.org>2010-11-06 10:04:33 +0300
commit4a92379bdfb48680a5e6775dd53a586df7b6b0b1 (patch)
tree5ca6d2ace37b081a2b00d22014fcd27c6ad74c46 /include/linux/slub_def.h
parent0d24db337e6d81c0c620ab65cc6947bd6553f742 (diff)
downloadlinux-4a92379bdfb48680a5e6775dd53a586df7b6b0b1.tar.xz
slub tracing: move trace calls out of always inlined functions to reduce kernel code size
Having the trace calls defined in the always inlined kmalloc functions in include/linux/slub_def.h causes a lot of code duplication as the trace functions get instantiated for each kamalloc call site. This can simply be removed by pushing the trace calls down into the functions in slub.c. On my x86_64 built this patch shrinks the code size of the kernel by approx 36K and also shrinks the code size of many modules -- too many to list here ;) size vmlinux (2.6.36) reports text data bss dec hex filename 5410611 743172 828928 6982711 6a8c37 vmlinux 5373738 744244 828928 6946910 6a005e vmlinux + patch The resulting kernel has had some testing & kmalloc trace still seems to work. This patch - moves trace_kmalloc out of the inlined kmalloc() and pushes it down into kmem_cache_alloc_trace() so this it only get instantiated once. - rename kmem_cache_alloc_notrace() to kmem_cache_alloc_trace() to indicate that now is does have tracing. (maybe this would better being called something like kmalloc_kmem_cache ?) - adds a new function kmalloc_order() to handle allocation and tracing of large allocations of page order. - removes tracing from the inlined kmalloc_large() replacing them with a call to kmalloc_order(); - move tracing out of inlined kmalloc_node() and pushing it down into kmem_cache_alloc_node_trace - rename kmem_cache_alloc_node_notrace() to kmem_cache_alloc_node_trace() - removes the include of trace/events/kmem.h from slub_def.h. v2 - keep kmalloc_order_trace inline when !CONFIG_TRACE Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'include/linux/slub_def.h')
-rw-r--r--include/linux/slub_def.h55
1 files changed, 26 insertions, 29 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index e4f5ed180b9b..8b6e8ae5d5ca 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -10,9 +10,8 @@
#include <linux/gfp.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
-#include <linux/kmemleak.h>
-#include <trace/events/kmem.h>
+#include <linux/kmemleak.h>
enum stat_item {
ALLOC_FASTPATH, /* Allocation from cpu slab */
@@ -216,31 +215,40 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *__kmalloc(size_t size, gfp_t flags);
+static __always_inline void *
+kmalloc_order(size_t size, gfp_t flags, unsigned int order)
+{
+ void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
+ kmemleak_alloc(ret, size, 1, flags);
+ return ret;
+}
+
#ifdef CONFIG_TRACING
-extern void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags);
+extern void *
+kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size);
+extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order);
#else
static __always_inline void *
-kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
+kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
{
return kmem_cache_alloc(s, gfpflags);
}
+
+static __always_inline void *
+kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
+{
+ return kmalloc_order(size, flags, order);
+}
#endif
static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
{
unsigned int order = get_order(size);
- void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);
-
- kmemleak_alloc(ret, size, 1, flags);
- trace_kmalloc(_THIS_IP_, ret, size, PAGE_SIZE << order, flags);
-
- return ret;
+ return kmalloc_order_trace(size, flags, order);
}
static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
- void *ret;
-
if (__builtin_constant_p(size)) {
if (size > SLUB_MAX_SIZE)
return kmalloc_large(size, flags);
@@ -251,11 +259,7 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
if (!s)
return ZERO_SIZE_PTR;
- ret = kmem_cache_alloc_notrace(s, flags);
-
- trace_kmalloc(_THIS_IP_, ret, size, s->size, flags);
-
- return ret;
+ return kmem_cache_alloc_trace(s, flags, size);
}
}
return __kmalloc(size, flags);
@@ -266,14 +270,14 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node);
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
#ifdef CONFIG_TRACING
-extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
+extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
gfp_t gfpflags,
- int node);
+ int node, size_t size);
#else
static __always_inline void *
-kmem_cache_alloc_node_notrace(struct kmem_cache *s,
+kmem_cache_alloc_node_trace(struct kmem_cache *s,
gfp_t gfpflags,
- int node)
+ int node, size_t size)
{
return kmem_cache_alloc_node(s, gfpflags, node);
}
@@ -281,8 +285,6 @@ kmem_cache_alloc_node_notrace(struct kmem_cache *s,
static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
- void *ret;
-
if (__builtin_constant_p(size) &&
size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) {
struct kmem_cache *s = kmalloc_slab(size);
@@ -290,12 +292,7 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
if (!s)
return ZERO_SIZE_PTR;
- ret = kmem_cache_alloc_node_notrace(s, flags, node);
-
- trace_kmalloc_node(_THIS_IP_, ret,
- size, s->size, flags, node);
-
- return ret;
+ return kmem_cache_alloc_node_trace(s, flags, node, size);
}
return __kmalloc_node(size, flags, node);
}