linux-kernel - Re: [PATCH part5 5/7] memblock, mem_hotplug: Make memblock skip hotpluggable regions by default.

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Date:	Thu, 15 Aug 2013 13:15:35 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	robert.moore@...el.com, lv.zheng@...el.com, rjw@...k.pl,
	lenb@...nel.org, tglx@...utronix.de, mingo@...e.hu, hpa@...or.com,
	akpm@...ux-foundation.org, tj@...nel.org, trenn@...e.de,
	yinghai@...nel.org, jiang.liu@...wei.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	izumi.taku@...fujitsu.com, mgorman@...e.de, minchan@...nel.org,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	riel@...hat.com, jweiner@...hat.com, prarit@...hat.com,
	zhangyanfei@...fujitsu.com, yanghy@...fujitsu.com, x86@...nel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH part5 5/7] memblock, mem_hotplug: Make memblock skip hotpluggable
 regions by default.

On 08/15/2013 05:54 AM, Naoya Horiguchi wrote:
> On Thu, Aug 08, 2013 at 06:16:17PM +0800, Tang Chen wrote:
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
> ...
>> @@ -719,6 +723,10 @@ void __init_memblock __next_free_mem_range_rev(u64 *idx, int nid,
>>   		if (nid != MAX_NUMNODES&&  nid != memblock_get_region_node(m))
>>   			continue;
>>
>> +		/* skip hotpluggable memory regions */
>> +		if (m->flags&  MEMBLOCK_HOTPLUG)
>> +			continue;
>> +
>>   		/* scan areas before each reservation for intersection */
>>   		for ( ; ri>= 0; ri--) {
>>   			struct memblock_region *r =&rsv->regions[ri];
>> -- 
> 
> Why don't you add this also in __next_free_mem_range()?

Hi Naoya,

__next_free_mem_range_rev() is for for_each_free_mem_range_reverse(),
which is
only called in memblock_find_in_range_node().

But I think __next_free_mem_range() is for for_each_free_mem_range,
which is
called by many others. These callers could has nothing to do with memory
hotplug.
So I didn't add.

Maybe adding the check here is not good. I'm trying to find somewhere to
check MEMBLOCK_HOTPLUG.

Thanks. :)
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