Message-ID: <520C63F7.1080505@cn.fujitsu.com>
Date: Thu, 15 Aug 2013 13:15:35 +0800
From: Tang Chen <tangchen@cn.fujitsu.com>
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To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
CC: robert.moore@intel.com, lv.zheng@intel.com, rjw@sisk.pl, lenb@kernel.org,
        tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com,
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Subject: Re: [PATCH part5 5/7] memblock, mem_hotplug: Make memblock skip hotpluggable
 regions by default.
References: <1375956979-31877-1-git-send-email-tangchen@cn.fujitsu.com> <1375956979-31877-6-git-send-email-tangchen@cn.fujitsu.com> <1376517265-8yi1139t-mutt-n-horiguchi@ah.jp.nec.com>
In-Reply-To: <1376517265-8yi1139t-mutt-n-horiguchi@ah.jp.nec.com>
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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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