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

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Message-ID: <18021c70-a4a0-3007-c861-82ede74f965e@virtualopensystems.com>
Date:   Fri, 2 Dec 2016 10:13:43 +0100
From:   Maciej Bielski <m.bielski@...tualopensystems.com>
To:     Scott Branden <scott.branden@...adcom.com>,
        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>,
        Xishi Qiu <qiuxishi@...wei.com>
Cc:     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,
        Andrea Reale2 <REALEAN2@...ibm.com>,
        Kostas Katrinis <katrinisk@...ibm.com>,
        Christian Pinto <c.pinto@...tualopensystems.com>
Subject: Re: [RFC PATCH 0/2] arm64: memory-hotplug: Add Memory Hotplug support

Hello,

Recently we have announced our effort on that:
https://lkml.org/lkml/2016/11/17/49

For now we have a working solution for hotplug and we are performing
code cleanup to push the patches soon.

BR,

On 02/12/2016 01:19, 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?
> 
> 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(+)
> 

-- 
Maciej Bielski