On 11/29/2017 05:37 PM, Vasily Averin wrote:
> got it,
> kvmalloc does not use kmalloc for size <= (16*PAGE_SIZE)
>
No, it does use kmalloc() first:
void *kvmalloc_node(size_t size, gfp_t flags, int node)
{
gfp_t kmalloc_flags = flags;
....
/*
* Make sure that larger requests are not too disruptive - no OOM
* killer and no allocation failure warnings as we have a fallback
*/
if (size > PAGE_SIZE)
kmalloc_flags |= __GFP_NORETRY | __GFP_NOWARN;
ret = kmalloc_node(size, kmalloc_flags, node);
/*
* It doesn't really make sense to fallback to vmalloc for sub page
* requests
*/
if (ret || size <= PAGE_SIZE)
return ret;
return __vmalloc_node_flags(size, node, flags | __GFP_HIGHMEM);
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