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slab: introduce krealloc

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This introduce krealloc() that reallocates memory while keeping the contents
unchanged.  The allocator avoids reallocation if the new size fits the
currently used cache.  I also added a simple non-optimized version for
mm/slob.c for compatibility.

[[email protected]: fix warnings]
Acked-by: Josef Sipek <[email protected]>
Acked-by: Matt Mackall <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pekka Enberg 2007-05-06 14:48:40 -07:00 • committed by Linus Torvalds
commit fd76bab2fa
3 changed files with 84 additions and 3 deletions
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35
mm/slob.c
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@ -190,6 +190,39 @@ void *__kmalloc(size_t size, gfp_t gfp)
}
EXPORT_SYMBOL(__kmalloc);
/**
* krealloc - reallocate memory. The contents will remain unchanged.
*
* @p: object to reallocate memory for.
* @new_size: how many bytes of memory are required.
* @flags: the type of memory to allocate.
*
* The contents of the object pointed to are preserved up to the
* lesser of the new and old sizes. If @p is %NULL, krealloc()
* behaves exactly like kmalloc(). If @size is 0 and @p is not a
* %NULL pointer, the object pointed to is freed.
*/
void *krealloc(const void *p, size_t new_size, gfp_t flags)
{
void *ret;
if (unlikely(!p))
return kmalloc_track_caller(new_size, flags);
if (unlikely(!new_size)) {
kfree(p);
return NULL;
}
ret = kmalloc_track_caller(new_size, flags);
if (ret) {
memcpy(ret, p, min(new_size, ksize(p)));
kfree(p);
}
return ret;
}
EXPORT_SYMBOL(krealloc);
void kfree(const void *block)
{
bigblock_t *bb, **last = &bigblocks;
@ -219,7 +252,7 @@ void kfree(const void *block)
EXPORT_SYMBOL(kfree);
unsigned int ksize(const void *block)
size_t ksize(const void *block)
{
bigblock_t *bb;
unsigned long flags;