Date: Fri, 31 Aug 2012 13:49:56 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: wency@cn.fujitsu.com
Cc: x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org,
        linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
        linux-ia64@vger.kernel.org, cmetcalf@tilera.com,
        sparclinux@vger.kernel.org, rientjes@google.com, liuj97@gmail.com,
        len.brown@intel.com, benh@kernel.crashing.org, paulus@samba.org,
        cl@linux.com, minchan.kim@gmail.com, kosaki.motohiro@jp.fujitsu.com,
        isimatu.yasuaki@jp.fujitsu.com
Subject: Re: [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory
Message-Id: <20120831134956.fec0f681.akpm@linux-foundation.org>
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References: <1346148027-24468-1-git-send-email-wency@cn.fujitsu.com>
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On Tue, 28 Aug 2012 18:00:07 +0800
wency@cn.fujitsu.com wrote:

> This patch series aims to support physical memory hot-remove.

Have you had much review and testing feedback yet?

> The patches can free/remove the following things:
> 
>   - acpi_memory_info                          : [RFC PATCH 4/19]
>   - /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 8/19]
>   - iomem_resource                            : [RFC PATCH 9/19]
>   - mem_section and related sysfs files       : [RFC PATCH 10-11, 13-16/19]
>   - page table of removed memory              : [RFC PATCH 12/19]
>   - node and related sysfs files              : [RFC PATCH 18-19/19]
> 
> If you find lack of function for physical memory hot-remove, please let me
> know.

I doubt if many people have hardware which permits physical memory
removal?  How would you suggest that people with regular hardware can
test these chagnes?

> Known problems:
> 1. memory can't be offlined when CONFIG_MEMCG is selected.

That's quite a problem!  Do you have a description of why this is the
case, and a plan for fixing it?

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