linux-kernel - Re: [PATCH v2] memory-hotplug: add sysfs zones_online

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Message-ID: <1408138647.26567.42.camel@misato.fc.hp.com>
Date:	Fri, 15 Aug 2014 15:37:27 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Zhang Zhen <zhenzhang.zhang@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	David Rientjes <rientjes@...gle.com>,
	isimatu.yasuaki@...fujitsu.com, n-horiguchi@...jp.nec.com,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2] memory-hotplug: add sysfs zones_online_to attribute

On Wed, 2014-08-13 at 12:10 +0800, Zhang Zhen wrote:
> Currently memory-hotplug has two limits:
> 1. If the memory block is in ZONE_NORMAL, you can change it to
> ZONE_MOVABLE, but this memory block must be adjacent to ZONE_MOVABLE.
> 2. If the memory block is in ZONE_MOVABLE, you can change it to
> ZONE_NORMAL, but this memory block must be adjacent to ZONE_NORMAL.
> 
> With this patch, we can easy to know a memory block can be onlined to
> which zone, and don't need to know the above two limits.
> 
> Updated the related Documentation.
> 
> Change v1 -> v2:
> - optimize the implementation following Dave Hansen's suggestion
> 
> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>
> ---
>  Documentation/ABI/testing/sysfs-devices-memory |  8 ++++
>  Documentation/memory-hotplug.txt               |  4 +-
>  drivers/base/memory.c                          | 62 ++++++++++++++++++++++++++
>  include/linux/memory_hotplug.h                 |  1 +
>  mm/memory_hotplug.c                            |  2 +-
>  5 files changed, 75 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-devices-memory b/Documentation/ABI/testing/sysfs-devices-memory
> index 7405de2..2b2a1d7 100644
> --- a/Documentation/ABI/testing/sysfs-devices-memory
> +++ b/Documentation/ABI/testing/sysfs-devices-memory
> @@ -61,6 +61,14 @@ Users:		hotplug memory remove tools
>  		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils
> 
> 
> +What:           /sys/devices/system/memory/memoryX/zones_online_to

I think this name is a bit confusing.  How about "valid_online_types"?

Thanks,
-Toshi



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