linux-kernel - Re: [PATCH 1/4] memblock: memblock_virt_alloc_internal(): alloc from specified node only

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Date:	Mon, 10 Feb 2014 15:27:39 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Luiz Capitulino <lcapitulino@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	mtosatti@...hat.com, mgorman@...e.de, aarcange@...hat.com,
	andi@...stfloor.org, riel@...hat.com
Subject: Re: [PATCH 1/4] memblock: memblock_virt_alloc_internal(): alloc
 from specified node only

On Mon, 10 Feb 2014 12:27:45 -0500 Luiz Capitulino <lcapitulino@...hat.com> wrote:

> From: Luiz capitulino <lcapitulino@...hat.com>
> 
> If an allocation from the node specified by the nid argument fails,
> memblock_virt_alloc_internal() automatically tries to allocate memory
> from other nodes.
> 
> This is fine is the caller don't care which node is going to allocate
> the memory. However, there are cases where the caller wants memory to
> be allocated from the specified node only. If that's not possible, then
> memblock_virt_alloc_internal() should just fail.
> 
> This commit adds a new flags argument to memblock_virt_alloc_internal()
> where the caller can control this behavior.
> 
> ...
>
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -1028,6 +1028,8 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
>  	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
>  }
>  
> +#define ALLOC_SPECIFIED_NODE_ONLY 0x1
> +
>  /**
>   * memblock_virt_alloc_internal - allocate boot memory block
>   * @size: size of memory block to be allocated in bytes
> @@ -1058,7 +1060,7 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
>  static void * __init memblock_virt_alloc_internal(
>  				phys_addr_t size, phys_addr_t align,
>  				phys_addr_t min_addr, phys_addr_t max_addr,
> -				int nid)
> +				int nid, unsigned int flags)
>  {
>  	phys_addr_t alloc;
>  	void *ptr;
> @@ -1085,6 +1087,8 @@ again:
>  					    nid);
>  	if (alloc)
>  		goto done;
> +	else if (flags & ALLOC_SPECIFIED_NODE_ONLY)
> +		goto error;

"else" is unneeded.

>  	if (nid != NUMA_NO_NODE) {
>  		alloc = memblock_find_in_range_node(size, align, min_addr,
>
> ...
>
--
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