Re: [tip:sched/urgent] sched: Check sched_domain before computinggroup power

[Yinghai Lu]

On Thu, Nov 21, 2013 at 7:03 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>>
>> This one seems fix NULL reference in compute_group_power.
>>
>> but get following on current Linus tree plus tip/sched/urgent.
>>
>> divide error: 0000 [#1]  SMP
>> [   28.190477] Modules linked in:
>> [   28.192012] CPU: 11 PID: 484 Comm: kworker/u324:0 Not tainted
>> 3.12.0-yh-10487-g4b94e59-dirty #2044
>> [   28.210488] Hardware name: Oracle Corporation  Sun Fire
>> [   28.229877] task: ffff88ff25205140 ti: ffff88ff2520a000 task.ti:
>> ffff88ff2520a000
>> [   28.236139] RIP: 0010:[<ffffffff810d9ff4>]  [<ffffffff810d9ff4>]
>> find_busiest_group+0x2b4/0x8a0
>
> Hurmph.. what kind of hardware is that? and is there anything funny you
> do to make it do this?

intel nehanem-ex or westmere-ex 8 sockets system.

I tried without my local patches, the problem is still there.

Yinghai
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