linux-kernel - Re: [RFC PATCH 0/2] arm64: memory-hotplug: Add Memory Hotplug support

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Message-ID: <5840D333.9050801@huawei.com>
Date:   Fri, 2 Dec 2016 09:49:39 +0800
From:   Xishi Qiu <qiuxishi@...wei.com>
To:     Scott Branden <scott.branden@...adcom.com>
CC:     Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Mark Rutland <mark.rutland@....com>, <bielski@...tmail.net>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Tang Chen <tangchen@...fujitsu.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/2] arm64: memory-hotplug: Add Memory Hotplug support

On 2016/12/2 8:19, Scott Branden wrote:

> This patchset is sent for comment to add memory hotplug support for ARM64
> based platforms.  It follows hotplug code added for other architectures
> in the linux kernel.
> 
> I tried testing the memory hotplug feature following documentation from
> Documentation/memory-hotplug.txt.  I don't think it is working as expected
> - see below:
> 
> To add memory to the system I did the following:
> echo 0x400000000 > /sys/devices/system/memory/probe
> 
> The memory is displayed as system ram:
> cat /proc/iomem:
> 74000000-77ffffff : System RAM
>   74080000-748dffff : Kernel code
>   74950000-749d2fff : Kernel data
> 400000000-43fffffff : System RAM
> 
> But does not seem to be added to the kernel memory.
> /proc/meminfo did not change.
> 
> What else needs to be done so the memory is added to the kernel memory
> pool for normal allocation?
> 

Hi Scott,

Do you mean it still don't support hod-add after apply this patchset?

Thanks,
Xishi Qiu

> Scott Branden (2):
>   arm64: memory-hotplug: Add MEMORY_HOTPLUG, MEMORY_HOTREMOVE,
>     MEMORY_PROBE
>   arm64: defconfig: enable MEMORY_HOTPLUG config options
> 
>  arch/arm64/Kconfig           | 10 ++++++++++
>  arch/arm64/configs/defconfig |  3 +++
>  arch/arm64/mm/init.c         | 42 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 55 insertions(+)
>