Re: [RFC] mm: generic adaptive large memory allocation APIs

[KOSAKI Motohiro]

Hi

> void *kvmalloc(size_t size)
> {
> 	void *ptr;
> 
> 	if (size < PAGE_SIZE)
> 		return kmalloc(PAGE_SIZE, GFP_KERNEL);
> 	ptr = alloc_pages_exact(size, GFP_KERNEL | __GFP_NOWARN);

low order GFP_KERNEL allocation never fail. then, this doesn't works
as you expected.

> 	if (ptr != NULL)
> 		return ptr;
> 
> 	return vmalloc(size);

On x86, vmalloc area is only 128MB address space. it is very rare 
resource than physical ram. vmalloc fallback is not good idea.


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