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Date: Fri, 11 Dec 2009 07:57:07 +0200
From: Pekka Enberg <penberg@...helsinki.fi>
To: Li Zefan <lizf@...fujitsu.com>
CC: Ingo Molnar <mingo@...e.hu>,
Christoph Lameter <cl@...ux-foundation.org>,
Steven Rostedt <rostedt@...dmis.org>,
Frederic Weisbecker <fweisbec@...il.com>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Subject: Re: [PATCH 1/2] tracing: Define kmem_trace_alloc_notrace unconditionally
Li Zefan wrote:
> Always define kmem_trace_alloc_{,node}_notrace(), otherwise
> perf-kmem will show wrong stats ifndef CONFIG_KMEMTRACE,
> because a kmalloc() memory allocation may be traced by
> both trace_kmalloc() and trace_kmem_cache_alloc().
>
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Did you check how much this will make kernel text bigger because of the
inlining happening in kmem_cache_alloc_notrace()?
Pekka
> ---
> include/linux/slab_def.h | 24 ++----------------------
> include/linux/slub_def.h | 27 +++------------------------
> mm/slab.c | 12 ------------
> mm/slub.c | 4 ----
> 4 files changed, 5 insertions(+), 62 deletions(-)
>
> diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
> index 850d057..1c9ce4b 100644
> --- a/include/linux/slab_def.h
> +++ b/include/linux/slab_def.h
> @@ -109,21 +109,12 @@ extern struct cache_sizes malloc_sizes[];
>
> void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
> void *__kmalloc(size_t size, gfp_t flags);
> +void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags);
>
> -#ifdef CONFIG_KMEMTRACE
> -extern void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags);
> -extern size_t slab_buffer_size(struct kmem_cache *cachep);
> -#else
> -static __always_inline void *
> -kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags)
> -{
> - return kmem_cache_alloc(cachep, flags);
> -}
> static inline size_t slab_buffer_size(struct kmem_cache *cachep)
> {
> - return 0;
> + return cachep->buffer_size;
> }
> -#endif
>
> static __always_inline void *kmalloc(size_t size, gfp_t flags)
> {
> @@ -165,20 +156,9 @@ found:
> #ifdef CONFIG_NUMA
> extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
> extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
> -
> -#ifdef CONFIG_KMEMTRACE
> extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
> gfp_t flags,
> int nodeid);
> -#else
> -static __always_inline void *
> -kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
> - gfp_t flags,
> - int nodeid)
> -{
> - return kmem_cache_alloc_node(cachep, flags, nodeid);
> -}
> -#endif
>
> static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
> {
> diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
> index 5ad70a6..5c5ca0c 100644
> --- a/include/linux/slub_def.h
> +++ b/include/linux/slub_def.h
> @@ -215,18 +215,9 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
> #endif
>
> void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
> +void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags);
> void *__kmalloc(size_t size, gfp_t flags);
>
> -#ifdef CONFIG_KMEMTRACE
> -extern void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags);
> -#else
> -static __always_inline void *
> -kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
> -{
> - return kmem_cache_alloc(s, gfpflags);
> -}
> -#endif
> -
> static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
> {
> unsigned int order = get_order(size);
> @@ -265,20 +256,8 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
> #ifdef CONFIG_NUMA
> 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_KMEMTRACE
> -extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
> - gfp_t gfpflags,
> - int node);
> -#else
> -static __always_inline void *
> -kmem_cache_alloc_node_notrace(struct kmem_cache *s,
> - gfp_t gfpflags,
> - int node)
> -{
> - return kmem_cache_alloc_node(s, gfpflags, node);
> -}
> -#endif
> +void *kmem_cache_alloc_node_notrace(struct kmem_cache *s, gfp_t gfpflags,
> + int node);
>
> static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
> {
> diff --git a/mm/slab.c b/mm/slab.c
> index 7dfa481..e556380 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -490,14 +490,6 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp)
>
> #endif
>
> -#ifdef CONFIG_KMEMTRACE
> -size_t slab_buffer_size(struct kmem_cache *cachep)
> -{
> - return cachep->buffer_size;
> -}
> -EXPORT_SYMBOL(slab_buffer_size);
> -#endif
> -
> /*
> * Do not go above this order unless 0 objects fit into the slab.
> */
> @@ -3558,13 +3550,11 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
> }
> EXPORT_SYMBOL(kmem_cache_alloc);
>
> -#ifdef CONFIG_KMEMTRACE
> void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags)
> {
> return __cache_alloc(cachep, flags, __builtin_return_address(0));
> }
> EXPORT_SYMBOL(kmem_cache_alloc_notrace);
> -#endif
>
> /**
> * kmem_ptr_validate - check if an untrusted pointer might be a slab entry.
> @@ -3621,7 +3611,6 @@ void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
> }
> EXPORT_SYMBOL(kmem_cache_alloc_node);
>
> -#ifdef CONFIG_KMEMTRACE
> void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
> gfp_t flags,
> int nodeid)
> @@ -3630,7 +3619,6 @@ void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
> __builtin_return_address(0));
> }
> EXPORT_SYMBOL(kmem_cache_alloc_node_notrace);
> -#endif
>
> static __always_inline void *
> __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller)
> diff --git a/mm/slub.c b/mm/slub.c
> index 4996fc7..a1c8fe5 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1754,13 +1754,11 @@ void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
> }
> EXPORT_SYMBOL(kmem_cache_alloc);
>
> -#ifdef CONFIG_KMEMTRACE
> void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
> {
> return slab_alloc(s, gfpflags, -1, _RET_IP_);
> }
> EXPORT_SYMBOL(kmem_cache_alloc_notrace);
> -#endif
>
> #ifdef CONFIG_NUMA
> void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
> @@ -1775,7 +1773,6 @@ void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
> EXPORT_SYMBOL(kmem_cache_alloc_node);
> #endif
>
> -#ifdef CONFIG_KMEMTRACE
> void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
> gfp_t gfpflags,
> int node)
> @@ -1783,7 +1780,6 @@ void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
> return slab_alloc(s, gfpflags, node, _RET_IP_);
> }
> EXPORT_SYMBOL(kmem_cache_alloc_node_notrace);
> -#endif
>
> /*
> * Slow patch handling. This may still be called frequently since objects
--
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