[PATCH v4 13/17] mm/sl[au]b: cleanup kmem_cache_alloc[_node]_trace()

Hyeonggon Yoo
2022-08-17T10:20:27Z

This patch does:
- Despite its name, kmem_cache_alloc[_node]_trace() is hook for
inlined kmalloc. So rename it to kmalloc[_node]_trace().

- Move its implementation to slab_common.c by using
__kmem_cache_alloc_node(), but keep CONFIG_TRACING=n varients to
save a function call when CONFIG_TRACING=n.

- Use __assume_kmalloc_alignment for kmalloc[_node]_trace
instead of __assume_slab_alignement. Generally kmalloc has
larger alignment requirements.

Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
---
include/linux/slab.h | 27 ++++++++++++++-------------
mm/slab.c | 35 -----------------------------------
mm/slab_common.c | 27 +++++++++++++++++++++++++++
mm/slub.c | 27 ---------------------------
4 files changed, 41 insertions(+), 75 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 4ee5b2fed164..c8e485ce8815 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -449,16 +449,16 @@ void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node) __assum
__malloc;

#ifdef CONFIG_TRACING
-extern void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t flags, size_t size)
- __assume_slab_alignment __alloc_size(3);
-
-extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
- int node, size_t size) __assume_slab_alignment
- __alloc_size(4);
+void *kmalloc_trace(struct kmem_cache *s, gfp_t flags, size_t size)
+ __assume_kmalloc_alignment __alloc_size(3);

+void *kmalloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
+ int node, size_t size) __assume_kmalloc_alignment
+ __alloc_size(4);
#else /* CONFIG_TRACING */
-static __always_inline __alloc_size(3) void *kmem_cache_alloc_trace(struct kmem_cache *s,
- gfp_t flags, size_t size)
+/* Save a function call when CONFIG_TRACING=n */
+static __always_inline __alloc_size(3)
+void *kmalloc_trace(struct kmem_cache *s, gfp_t flags, size_t size)
{
void *ret = kmem_cache_alloc(s, flags);

@@ -466,8 +466,9 @@ static __always_inline __alloc_size(3) void *kmem_cache_alloc_trace(struct kmem_
return ret;
}

-static __always_inline void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
- int node, size_t size)
+static __always_inline __alloc_size(4)
+void *kmalloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
+ int node, size_t size)
{
void *ret = kmem_cache_alloc_node(s, gfpflags, node);

@@ -550,7 +551,7 @@ static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
if (!index)
return ZERO_SIZE_PTR;

- return kmem_cache_alloc_trace(
+ return kmalloc_trace(
kmalloc_caches[kmalloc_type(flags)][index],
flags, size);
#endif
@@ -572,9 +573,9 @@ static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t fla
if (!index)
return ZERO_SIZE_PTR;

- return kmem_cache_alloc_node_trace(
+ return kmalloc_node_trace(
kmalloc_caches[kmalloc_type(flags)][index],
- flags, node, size);
+ flags, node, size);
}
return __kmalloc_node(size, flags, node);
}
diff --git a/mm/slab.c b/mm/slab.c
index 5b234e3ab165..8d9d0fbf9792 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3519,22 +3519,6 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
}
EXPORT_SYMBOL(kmem_cache_alloc_bulk);

-#ifdef CONFIG_TRACING
-void *
-kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size)
-{
- void *ret;
-
- ret = slab_alloc(cachep, NULL, flags, size, _RET_IP_);
-
- ret = kasan_kmalloc(cachep, ret, size, flags);
- trace_kmalloc(_RET_IP_, ret, cachep,
- size, cachep->size, flags);
- return ret;
-}
-EXPORT_SYMBOL(kmem_cache_alloc_trace);
-#endif
-
/**
* kmem_cache_alloc_node - Allocate an object on the specified node
* @cachep: The cache to allocate from.
@@ -3568,25 +3552,6 @@ void *__kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
orig_size, caller);
}

-#ifdef CONFIG_TRACING
-void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep,
- gfp_t flags,
- int nodeid,
- size_t size)
-{
- void *ret;
-
- ret = slab_alloc_node(cachep, NULL, flags, nodeid, size, _RET_IP_);
-
- ret = kasan_kmalloc(cachep, ret, size, flags);
- trace_kmalloc_node(_RET_IP_, ret, cachep,
- size, cachep->size,
- flags, nodeid);
- return ret;
-}
-EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
-#endif
-
#ifdef CONFIG_PRINTK
void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
{
diff --git a/mm/slab_common.c b/mm/slab_common.c
index c8242b4e2223..d8e8c41c12f1 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1000,6 +1000,33 @@ size_t __ksize(const void *object)
return slab_ksize(folio_slab(folio)->slab_cache);
}
EXPORT_SYMBOL(__ksize);
+
+#ifdef CONFIG_TRACING
+void *kmalloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
+{
+ void *ret = __kmem_cache_alloc_node(s, gfpflags, NUMA_NO_NODE,
+ size, _RET_IP_);
+
+ trace_kmalloc_node(_RET_IP_, ret, s, size, s->size,
+ gfpflags, NUMA_NO_NODE);
+
+ ret = kasan_kmalloc(s, ret, size, gfpflags);
+ return ret;
+}
+EXPORT_SYMBOL(kmalloc_trace);
+
+void *kmalloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
+ int node, size_t size)
+{
+ void *ret = __kmem_cache_alloc_node(s, gfpflags, node, size, _RET_IP_);
+
+ trace_kmalloc_node(_RET_IP_, ret, s, size, s->size, gfpflags, node);
+
+ ret = kasan_kmalloc(s, ret, size, gfpflags);
+ return ret;
+}
+EXPORT_SYMBOL(kmalloc_node_trace);
+#endif /* !CONFIG_TRACING */
#endif /* !CONFIG_SLOB */

gfp_t kmalloc_fix_flags(gfp_t flags)
diff --git a/mm/slub.c b/mm/slub.c
index cd49785d59e1..7d7fd9d4e8fa 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3270,17 +3270,6 @@ void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags,
caller, orig_size);
}

-#ifdef CONFIG_TRACING
-void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
-{
- void *ret = slab_alloc(s, NULL, gfpflags, _RET_IP_, size);
- trace_kmalloc(_RET_IP_, ret, s, size, s->size, gfpflags);
- ret = kasan_kmalloc(s, ret, size, gfpflags);
- return ret;
-}
-EXPORT_SYMBOL(kmem_cache_alloc_trace);
-#endif
-
void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
{
void *ret = slab_alloc_node(s, NULL, gfpflags, node, _RET_IP_, s->object_size);
@@ -3292,22 +3281,6 @@ void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
}
EXPORT_SYMBOL(kmem_cache_alloc_node);

-#ifdef CONFIG_TRACING
-void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
- gfp_t gfpflags,
- int node, size_t size)
-{
- void *ret = slab_alloc_node(s, NULL, gfpflags, node, _RET_IP_, size);
-
- trace_kmalloc_node(_RET_IP_, ret, s,
- size, s->size, gfpflags, node);
-
- ret = kasan_kmalloc(s, ret, size, gfpflags);
- return ret;
-}
-EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
-#endif
-
/*
* Slow path handling. This may still be called frequently since objects
* have a longer lifetime than the cpu slabs in most processing loads.
--
2.32.0