linux-kernel - Re: [PATCH 04/15] kmemleak: Add the slob memory allocation/freeing hooks

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Date:	Wed, 10 Dec 2008 12:36:01 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 04/15] kmemleak: Add the slob memory allocation/freeing
	hooks

On Wed, 2008-12-10 at 18:27 +0000, Catalin Marinas wrote:
> This patch adds the callbacks to memleak_(alloc|free) functions from the
> slob allocator.

Is this different than the last one?

Acked-by: Matt Mackall <mpm@...enic.com>

> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Matt Mackall <mpm@...enic.com>
> Cc: Pekka Enberg <penberg@...helsinki.fi>
> ---
>  mm/slob.c |   15 +++++++++++----
>  1 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/slob.c b/mm/slob.c
> index cb675d1..ff5a98d 100644
> --- a/mm/slob.c
> +++ b/mm/slob.c
> @@ -60,6 +60,7 @@
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
>  #include <linux/mm.h>
> +#include <linux/memleak.h>
>  #include <linux/cache.h>
>  #include <linux/init.h>
>  #include <linux/module.h>
> @@ -463,6 +464,7 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
>  {
>  	unsigned int *m;
>  	int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
> +	void *ret;
>  
>  	if (size < PAGE_SIZE - align) {
>  		if (!size)
> @@ -472,18 +474,18 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
>  		if (!m)
>  			return NULL;
>  		*m = size;
> -		return (void *)m + align;
> +		ret = (void *)m + align;
>  	} else {
> -		void *ret;
> -
>  		ret = slob_new_page(gfp | __GFP_COMP, get_order(size), node);
>  		if (ret) {
>  			struct page *page;
>  			page = virt_to_page(ret);
>  			page->private = size;
>  		}
> -		return ret;
>  	}
> +
> +	memleak_alloc(ret, size, 1, gfp);
> +	return ret;
>  }
>  EXPORT_SYMBOL(__kmalloc_node);
>  
> @@ -493,6 +495,7 @@ void kfree(const void *block)
>  
>  	if (unlikely(ZERO_OR_NULL_PTR(block)))
>  		return;
> +	memleak_free(block);
>  
>  	sp = (struct slob_page *)virt_to_page(block);
>  	if (slob_page(sp)) {
> @@ -555,12 +558,14 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
>  	} else if (flags & SLAB_PANIC)
>  		panic("Cannot create slab cache %s\n", name);
>  
> +	memleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
>  	return c;
>  }
>  EXPORT_SYMBOL(kmem_cache_create);
>  
>  void kmem_cache_destroy(struct kmem_cache *c)
>  {
> +	memleak_free(c);
>  	slob_free(c, sizeof(struct kmem_cache));
>  }
>  EXPORT_SYMBOL(kmem_cache_destroy);
> @@ -577,6 +582,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
>  	if (c->ctor)
>  		c->ctor(b);
>  
> +	memleak_alloc_recursive(b, c->size, 1, c->flags, flags);
>  	return b;
>  }
>  EXPORT_SYMBOL(kmem_cache_alloc_node);
> @@ -599,6 +605,7 @@ static void kmem_rcu_free(struct rcu_head *head)
>  
>  void kmem_cache_free(struct kmem_cache *c, void *b)
>  {
> +	memleak_free_recursive(b, c->flags);
>  	if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
>  		struct slob_rcu *slob_rcu;
>  		slob_rcu = b + (c->size - sizeof(struct slob_rcu));
-- 
Mathematics is the supreme nostalgia of our time.

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