Re: Linux 4.9-rc6

From	Eric Dumazet <eric.dumazet@gmail.com>
Newsgroups	linux.kernel
Subject	Re: Linux 4.9-rc6
Date	2016-11-21 17:50 +0100
Message-ID	<sFZX3-3Fn-11@gated-at.bofh.it> (permalink)
References	(3 earlier) <sFLKq-2Qf-1@gated-at.bofh.it> <sFORX-4Q0-3@gated-at.bofh.it> <sFSiS-7gi-17@gated-at.bofh.it> <sFWZc-1K0-11@gated-at.bofh.it> <sFXiC-1QC-19@gated-at.bofh.it>
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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().

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Linux 4.9-rc6 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-20 23:10 +0100
  Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-20 23:40 +0100
    Re: Linux 4.9-rc6 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-21 00:30 +0100
      Re: Linux 4.9-rc6 Al Viro <viro@ZenIV.linux.org.uk> - 2016-11-21 02:40 +0100
        Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 06:00 +0100
          Re: Linux 4.9-rc6 David Rientjes <rientjes@google.com> - 2016-11-21 09:40 +0100
            Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 14:40 +0100
              Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 15:00 +0100
                Re: Linux 4.9-rc6 Eric Dumazet <eric.dumazet@gmail.com> - 2016-11-21 17:50 +0100

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