On 11/27/2014 10:42 AM, Han Pingtian wrote:
> On Wed, Nov 26, 2014 at 01:53:36PM +0100, Cyril Hrubis wrote:
>> Hi!
>>> We have a system which only has one NUMA node. When trying to run ksm02
>>> on it, becase the code calling get_allowed_nodes() with a count 2 as
>>> below:
>>>
>>> 972 /* Warning: *DO NOT* use this function in child */
>>> 973 unsigned int get_a_numa_node(void (*cleanup_fn) (void))
>>> 974 {
>>> 975 unsigned int nd1, nd2;
>>> 976 int ret;
>>> 977
>>> 978 ret = get_allowed_nodes(0, 2, &nd1, &nd2);
>>> 979 switch (ret) {
>>> 980 case 0:
>>> 981 break;
>>> 982 case -3:
>>> 983 tst_brkm(TCONF, cleanup_fn, "requires a NUMA system.");
>>>
>>> it always failed with "requires a NUMA system.".
>>>
>>> I think a NUMA system may have only one node, right? If so, could we
>>> change the count to 1?
>>
>> Hmm, are you sure that the testcases are actually applicable to a system
>> with only one node?
>>
>> Because what the testcases do in the setup is to write 1 to
>> /sys/kernel/mm/ksm/merge_across_nodes so I would expect that the test
>> needs at least two nodes...
>>
> I think if there is only one NUMA node, then this is a special case for
> this testcase, it'll test if set "merge_across_nodes" to 1, any problem
> will be triggered.
>
> I have tried to change the node count to 1 in get_allowed_nodes() and
> recompiled ksm02. It works successfully.
>
Do you think ONLY ONE NODE can be called NUMA?
http://en.wikipedia.org/wiki/Non-uniform_memory_access
Thanks,
Wanlong Gao
> Thanks.
>
>
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