On 2014/2/5 8:14, Rafael J. Wysocki wrote:
> On Monday, January 20, 2014 10:31:54 AM Jiang Liu wrote:
>> Current ACPI cpu hotplug driver fails to associate hot-added CPUs with
>> corresponding NUMA node when doing socket online. The code path to
>> associate CPU with NUMA node is as below:
>> acpi_processor_add()
>> ->acpi_processor_get_info()
>> ->acpi_processor_hotadd_init()
>> ->acpi_map_lsapic()
>> ->_acpi_map_lsapic()
>> ->acpi_map_cpu2node()
>> cpu_subsys_online()
>> ->try_online_node()
>> ->node_set_online()
>>
>> When doing socket online, a new NUMA node is introduced in addition to
>> hot-added CPU and memory device. And the new NUMA node is marked as
>> online when onlining hot-added CPUs through sysfs interface
>> /sys/devices/system/cpu/cpuxx/online.
>>
>> On the other hand, acpi_map_cpu2node() will only build the CPU to node
>> map if corresponding NUMA node is already online, so it always fails
>> to associate hot-added CPUs with corresponding NUMA node because the
>> NUMA node is still in offline state.
>>
>> For the fix, we could safely remove the "node_online(node)" check in
>> function acpi_map_cpu2node() because it's only called for hot-added CPUs
>> by acpi_processor_hotadd_init().
>>
>> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
>
> I wonder what the status here is? Did this patch go anywhere?
Hi Rafael,
It's still in review stage, hasn't been accepted by any
maintainer yet.
Thanks!
Gerry
>
>> ---
>> arch/x86/kernel/acpi/boot.c | 8 ++++----
>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
>> index 6c0b43b..7625de9 100644
>> --- a/arch/x86/kernel/acpi/boot.c
>> +++ b/arch/x86/kernel/acpi/boot.c
>> @@ -614,10 +614,10 @@ static void acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
>> int nid;
>>
>> nid = acpi_get_node(handle);
>> - if (nid == -1 || !node_online(nid))
>> - return;
>> - set_apicid_to_node(physid, nid);
>> - numa_set_node(cpu, nid);
>> + if (nid != -1) {
>> + set_apicid_to_node(physid, nid);
>> + numa_set_node(cpu, nid);
>> + }
>> #endif
>> }
>>
>>
>
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