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

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Date:   Thu,  1 Dec 2016 16:19:57 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     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>, bielski@...tmail.net
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,
        Scott Branden <scott.branden@...adcom.com>
Subject: [RFC PATCH 0/2] arm64: memory-hotplug: Add Memory Hotplug support

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(+)

-- 
2.5.0