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

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Message-ID: <20140817110821.GM9305@htj.dyndns.org>
Date:	Sun, 17 Aug 2014 07:08:21 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Xishi Qiu <qiuxishi@...wei.com>
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()

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,
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.

-- 
tejun
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