linux-kernel - Re: [PATCH] mem-hotplug: let memblock skip the hotpluggable memory regions in __next_mem

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Message-ID: <53F15E33.40705@huawei.com>
Date:	Mon, 18 Aug 2014 10:00:19 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Tang Chen <tangchen@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	"Wen Congyang" <wency@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"H. Peter Anvin" <hpa@...or.com>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mem-hotplug: let memblock skip the hotpluggable memory
 regions in __next_mem_range()

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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