Re: [PATCH] mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem_range()

From: Xishi Qiu
Date: Sun Aug 17 2014 - 22:02:43 EST


On 2014/8/17 19:08, Tejun Heo wrote:

> Hello,
>
> On Sat, Aug 16, 2014 at 10:36:41PM +0800, Xishi Qiu wrote:
>> numa_clear_node_hotplug()? There is only numa_clear_kernel_node_hotplug().
>
> Yeah, that one.
>
>> If we don't clear hotpluggable flag in free_low_memory_core_early(), the
>> memory which marked hotpluggable flag will not free to buddy allocator.
>> Because __next_mem_range() will skip them.
>>
>> free_low_memory_core_early
>> for_each_free_mem_range
>> for_each_mem_range
>> __next_mem_range
>
> Ah, okay, so the patch fixes __next_mem_range() and thus makes
> free_low_memory_core_early() to skip hotpluggable regions unlike
> before. Please explain things like that in the changelog. Also,

OK, I will send V2.

Thanks,
Xishi Qiu

> what's its relationship with numa_clear_kernel_node_hotplug()? Do we
> still need them? If so, what are the different roles that these two
> separate places serve?
>
> Thanks.
>



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