linux-kernel - Re: Linux 4.9-rc6

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Message-ID: <1479746971.8455.416.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Mon, 21 Nov 2016 08:49:31 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 4.9-rc6

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().