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Subject: Re: Linux 4.9-rc6
From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Rientjes <rientjes@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Date: Mon, 21 Nov 2016 08:49:31 -0800
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On Mon, 2016-11-21 at 05:51 -0800, Eric Dumazet wrote:

> +		while (chunk_order) {
> +			if (node == NUMA_NO_NODE)
> +				page = alloc_pages(multi_alloc_mask, chunk_order);
> +			else
> +				page = alloc_pages_node(node, multi_alloc_mask, chunk_order);
> +			if (page) {
> +				split_page(page, chunk_order);
> +				break;
> +			}
> +			chunk_order--;
> +		}


We also could remember the page order with set_page_private() and
speedup show_numa_info()

I wonder if we could avoid the split_page() and speedup vfree().