Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1757608AbcLBBuN (ORCPT <rfc822;w@1wt.eu>);
        Thu, 1 Dec 2016 20:50:13 -0500
Received: from szxga03-in.huawei.com ([119.145.14.66]:51362 "EHLO
        szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1754837AbcLBBuL (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 1 Dec 2016 20:50:11 -0500
Message-ID: <5840D333.9050801@huawei.com>
Date: Fri, 2 Dec 2016 09:49:39 +0800
From: Xishi Qiu <qiuxishi@huawei.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
MIME-Version: 1.0
To: Scott Branden <scott.branden@broadcom.com>
CC: Arnd Bergmann <arnd@arndb.de>, Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>, <bielski@fastmail.net>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>,
        Tang Chen <tangchen@cn.fujitsu.com>,
        <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 0/2] arm64: memory-hotplug: Add Memory Hotplug support
References: <1480637999-4320-1-git-send-email-scott.branden@broadcom.com>
In-Reply-To: <1480637999-4320-1-git-send-email-scott.branden@broadcom.com>
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
X-Originating-IP: [10.177.25.179]
X-CFilter-Loop: Reflected
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 1372
Lines: 46

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(+)
>