Hi all:
          I got a problem£º
          1. on intel cpu xeon E5000 family which support xapic £¬one NIC
irq  can share on the CPUs basic on smp_affinity.
          2. but on intel cpu xeon E5-2600 family which support x2apic, one
NIC irq only on CPU0 whatever  i set the smp_affinfiy like as "aa"; "55";
"ff".
         My OS is CentOS 6.2  x32 £¬i test 4 cpus¡£ the result is which only
support apic can share one irq to all cpus£¬which support x2apic only make
the irq to one cpu¡£


want help me

                                                             richard


2012/11/8 Zhouping Liu <zliu@redhat.com>

> On 11/07/2012 11:25 PM, Mel Gorman wrote:
>
>> On Wed, Nov 07, 2012 at 05:27:12PM +0800, Zhouping Liu wrote:
>>
>>> Hello Mel,
>>>
>>> my 2 nodes machine hit a panic fault after applied the patch
>>> set(based on kernel-3.7.0-rc4), please review it:
>>>
>>> <SNIP>
>>>
>> Early initialisation problem by the looks of things. Try this please
>>
>
> Tested the patch, and the issue is gone.
>
>
>> ---8<---
>> mm: numa: Check that preferred_node_policy is initialised
>>
>> Zhouping Liu reported the following
>>
>> [ 0.000000] ------------[ cut here ]------------
>> [ 0.000000] kernel BUG at mm/mempolicy.c:1785!
>> [ 0.000000] invalid opcode: 0000 [#1] SMP
>> [ 0.000000] Modules linked in:
>> [ 0.000000] CPU 0
>> ....
>> [    0.000000] Call Trace:
>> [    0.000000] [<ffffffff81176966>] alloc_pages_current+0xa6/0x170
>> [    0.000000] [<ffffffff81137a44>] __get_free_pages+0x14/0x50
>> [    0.000000] [<ffffffff819efd9b>] kmem_cache_init+0x53/0x2d2
>> [    0.000000] [<ffffffff819caa53>] start_kernel+0x1e0/0x3c7
>>
>> Problem is that early in boot preferred_nod_policy and SLUB
>> initialisation trips up. Check it is initialised.
>>
>> Signed-off-by: Mel Gorman <mgorman@suse.de>
>>
>
> Tested-by: Zhouping Liu <zliu@redhat.com>
>
> Thanks,
> Zhouping
>
>  ---
>>   mm/mempolicy.c |    4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
>> index 11d4b6b..8cfa6dc 100644
>> --- a/mm/mempolicy.c
>> +++ b/mm/mempolicy.c
>> @@ -129,6 +129,10 @@ static struct mempolicy *get_task_policy(struct
>> task_struct *p)
>>                 node = numa_node_id();
>>                 if (node != -1)
>>                         pol = &preferred_node_policy[node];
>> +
>> +               /* preferred_node_policy is not initialised early in boot
>> */
>> +               if (!pol->mode)
>> +                       pol = NULL;
>>         }
>>         return pol;
>>
>> --
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>
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