Re: [tip:x86/mm] x86/mm/numa: Fix 32-bit kernel NUMA boot

[Yinghai Lu]

On Thu, Dec 19, 2013 at 7:42 AM, tip-bot for Lans Zhang
<tipbot@xxxxxxxxx> wrote:
> Commit-ID:  f3d815cb854b2f6262ade56a4d91a1ed3f1e50c4
> Gitweb:     http://git.kernel.org/tip/f3d815cb854b2f6262ade56a4d91a1ed3f1e50c4
> Author:     Lans Zhang <jia.zhang@xxxxxxxxxxxxx>
> AuthorDate: Fri, 6 Dec 2013 12:18:30 +0800
> Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
> CommitDate: Thu, 19 Dec 2013 13:58:36 +0100
>
> x86/mm/numa: Fix 32-bit kernel NUMA boot
>
> When booting a 32-bit x86 kernel on a NUMA machine, node data
> cannot be allocated from local node if the account of memory for
> node 0 covers the low memory space entirely:
>
>   [    0.000000] Initmem setup node 0 [mem 0x00000000-0x83fffffff]
>   [    0.000000]   NODE_DATA [mem 0x367ed000-0x367edfff]
>   [    0.000000] Initmem setup node 1 [mem 0x840000000-0xfffffffff]
>   [    0.000000] Cannot find 4096 bytes in node 1
>   [    0.000000] 64664MB HIGHMEM available.
>   [    0.000000] 871MB LOWMEM available.
>
> To fix this issue, node data is allowed to be allocated from
> other nodes if the memory of local node is still not mapped. The
> expected result looks like this:
>
>   [    0.000000] Initmem setup node 0 [mem 0x00000000-0x83fffffff]
>   [    0.000000]   NODE_DATA [mem 0x367ed000-0x367edfff]
>   [    0.000000] Initmem setup node 1 [mem 0x840000000-0xfffffffff]
>   [    0.000000]   NODE_DATA [mem 0x367ec000-0x367ecfff]
>   [    0.000000]     NODE_DATA(1) on node 0
>   [    0.000000] 64664MB HIGHMEM available.
>   [    0.000000] 871MB LOWMEM available.
>
> Signed-off-by: Lans Zhang <jia.zhang@xxxxxxxxxxxxx>
> Cc: <andi@xxxxxxxxxxxxxx>
> Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
> Link: http://lkml.kernel.org/r/1386303510-18574-1-git-send-email-jia.zhang@xxxxxxxxxxxxx
> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> ---
>  arch/x86/mm/numa.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 24aec58..c85da7b 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -211,9 +211,13 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
>          */
>         nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
>         if (!nd_pa) {
> -               pr_err("Cannot find %zu bytes in node %d\n",
> -                      nd_size, nid);
> -               return;
> +               nd_pa = __memblock_alloc_base(nd_size, SMP_CACHE_BYTES,
> +                                             MEMBLOCK_ALLOC_ACCESSIBLE);
> +               if (!nd_pa) {
> +                       pr_err("Cannot find %zu bytes in node %d\n",
> +                              nd_size, nid);
> +                       return;
> +               }
>         }
>         nd = __va(nd_pa);
>

Can you just use memblock_alloc_try_nid instead memblock_alloc_nid?

Thanks

Yinghai
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