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Date: Mon, 28 Jul 2008 12:37:14 +0300
From: Pekka Enberg <penberg@...helsinki.fi>
To: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Cc: cl@...ux-foundation.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, rdunlap@...otime.net,
mpm@...enic.com, vegard.nossum@...il.com
Subject: Re: [RFC PATCH 2/4] kmemtrace: SLAB hooks.
On Tue, 2008-07-22 at 21:36 +0300, Eduard - Gabriel Munteanu wrote:
> This adds hooks for the SLAB allocator, to allow tracing with kmemtrace.
>
> Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
> ---
> include/linux/slab_def.h | 68 ++++++++++++++++++++++++++++++++++++++------
> mm/slab.c | 71 +++++++++++++++++++++++++++++++++++++++++----
> 2 files changed, 123 insertions(+), 16 deletions(-)
>
> diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
> index 39c3a5e..7555ce9 100644
> --- a/include/linux/slab_def.h
> +++ b/include/linux/slab_def.h
> @@ -14,6 +14,7 @@
> #include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
> #include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
> #include <linux/compiler.h>
> +#include <linux/kmemtrace.h>
>
> /* Size description struct for general caches. */
> struct cache_sizes {
> @@ -28,8 +29,26 @@ extern struct cache_sizes malloc_sizes[];
> void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
> void *__kmalloc(size_t size, gfp_t flags);
>
> -static inline void *kmalloc(size_t size, 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;
> +}
You're introducing this to work around the fact that struct kmem_cache
is defined in mm/slab.c? Please note that for kmemcheck we already moved
struct kmem_cache to a header file so we should be able to use the same
approach.
> +#endif
> +
> +static __always_inline void *kmalloc(size_t size, gfp_t flags)
> +{
> + struct kmem_cache *cachep;
> + void *ret;
> +
> if (__builtin_constant_p(size)) {
> int i = 0;
>
> @@ -50,10 +69,17 @@ static inline void *kmalloc(size_t size, gfp_t flags)
> found:
> #ifdef CONFIG_ZONE_DMA
> if (flags & GFP_DMA)
> - return kmem_cache_alloc(malloc_sizes[i].cs_dmacachep,
> - flags);
> + cachep = malloc_sizes[i].cs_dmacachep;
> + else
> #endif
> - return kmem_cache_alloc(malloc_sizes[i].cs_cachep, flags);
> + cachep = malloc_sizes[i].cs_cachep;
> +
> + ret = kmem_cache_alloc_notrace(cachep, flags);
> +
> + kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, _THIS_IP_, ret,
> + size, slab_buffer_size(cachep), flags);
> +
> + return ret;
> }
> return __kmalloc(size, flags);
> }
> @@ -62,8 +88,25 @@ found:
> 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);
>
> -static inline void *kmalloc_node(size_t size, 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)
> {
> + struct kmem_cache *cachep;
> + void *ret;
> +
> if (__builtin_constant_p(size)) {
> int i = 0;
>
> @@ -84,11 +127,18 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
> found:
> #ifdef CONFIG_ZONE_DMA
> if (flags & GFP_DMA)
> - return kmem_cache_alloc_node(malloc_sizes[i].cs_dmacachep,
> - flags, node);
> + cachep = malloc_sizes[i].cs_dmacachep;
> + else
> #endif
> - return kmem_cache_alloc_node(malloc_sizes[i].cs_cachep,
> - flags, node);
> + cachep = malloc_sizes[i].cs_cachep;
> +
> + ret = kmem_cache_alloc_node_notrace(cachep, flags, node);
> +
> + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, _THIS_IP_,
> + ret, size, slab_buffer_size(cachep),
> + flags, node);
> +
> + return ret;
> }
> return __kmalloc_node(size, flags, node);
> }
> diff --git a/mm/slab.c b/mm/slab.c
> index 046607f..1496962 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -111,6 +111,7 @@
> #include <linux/rtmutex.h>
> #include <linux/reciprocal_div.h>
> #include <linux/debugobjects.h>
> +#include <linux/kmemtrace.h>
>
> #include <asm/cacheflush.h>
> #include <asm/tlbflush.h>
> @@ -567,6 +568,14 @@ 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.
> */
> @@ -3621,10 +3630,23 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp)
> */
> void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
> {
> - return __cache_alloc(cachep, flags, __builtin_return_address(0));
> + void *ret = __cache_alloc(cachep, flags, __builtin_return_address(0));
> +
> + kmemtrace_mark_alloc(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret,
> + obj_size(cachep), cachep->buffer_size, flags);
> +
> + return ret;
> }
> 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.
> * @cachep: the cache we're checking against
> @@ -3669,23 +3691,47 @@ out:
> #ifdef CONFIG_NUMA
> void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
> {
> - return __cache_alloc_node(cachep, flags, nodeid,
> - __builtin_return_address(0));
> + void *ret = __cache_alloc_node(cachep, flags, nodeid,
> + __builtin_return_address(0));
> +
> + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret,
> + obj_size(cachep), cachep->buffer_size,
> + flags, nodeid);
> +
> + return ret;
> }
> EXPORT_SYMBOL(kmem_cache_alloc_node);
>
> +#ifdef CONFIG_KMEMTRACE
> +void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
> + gfp_t flags,
> + int nodeid)
> +{
> + return __cache_alloc_node(cachep, flags, nodeid,
> + __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)
> {
> struct kmem_cache *cachep;
> + void *ret;
>
> cachep = kmem_find_general_cachep(size, flags);
> if (unlikely(ZERO_OR_NULL_PTR(cachep)))
> return cachep;
> - return kmem_cache_alloc_node(cachep, flags, node);
> + ret = kmem_cache_alloc_node_notrace(cachep, flags, node);
> +
> + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
> + (unsigned long) caller, ret,
> + size, cachep->buffer_size, flags, node);
> +
> + return ret;
> }
>
> -#ifdef CONFIG_DEBUG_SLAB
> +#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_KMEMTRACE)
> void *__kmalloc_node(size_t size, gfp_t flags, int node)
> {
> return __do_kmalloc_node(size, flags, node,
> @@ -3718,6 +3764,7 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
> void *caller)
> {
> struct kmem_cache *cachep;
> + void *ret;
>
> /* If you want to save a few bytes .text space: replace
> * __ with kmem_.
> @@ -3727,11 +3774,17 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
> cachep = __find_general_cachep(size, flags);
> if (unlikely(ZERO_OR_NULL_PTR(cachep)))
> return cachep;
> - return __cache_alloc(cachep, flags, caller);
> + ret = __cache_alloc(cachep, flags, caller);
> +
> + kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC,
> + (unsigned long) caller, ret,
> + size, cachep->buffer_size, flags);
> +
> + return ret;
> }
>
>
> -#ifdef CONFIG_DEBUG_SLAB
> +#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_KMEMTRACE)
> void *__kmalloc(size_t size, gfp_t flags)
> {
> return __do_kmalloc(size, flags, __builtin_return_address(0));
> @@ -3770,6 +3823,8 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
> debug_check_no_obj_freed(objp, obj_size(cachep));
> __cache_free(cachep, objp);
> local_irq_restore(flags);
> +
> + kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, objp);
> }
> EXPORT_SYMBOL(kmem_cache_free);
>
> @@ -3796,6 +3851,8 @@ void kfree(const void *objp)
> debug_check_no_obj_freed(objp, obj_size(c));
> __cache_free(c, (void *)objp);
> local_irq_restore(flags);
> +
> + kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, objp);
> }
> EXPORT_SYMBOL(kfree);
>
--
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