linux-kernel - [PATCH 0/3] memory hotplug: updates and bugfix for is

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Date:	Mon, 6 Sep 2010 14:40:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>, fengguang.wu@...el.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, andi.kleen@...el.com,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: [PATCH 0/3] memory hotplug: updates and bugfix for is_removable


Problem:

/sys/devices/system/memory/memoryX/removable file shows whether the section
can be offlined or not. Returns "1" if it seems removable.

Now, the file uses a similar logic to one offline_pages() uses.
Problem here is.
 
  - removable detection logics of is_removable() and offline_pages() is
    different from each other.
  - The logic, which check MIGRATE_TYPE, tend to be incorrect once fragmented.
    MIGRATE_TYPE of a pageblock is just a hint, no guarantee.

Then, this patch set does.

  - use the same logic between is_removable() and offline_pages().
  - don't use MIGRATE_TYPE, check the memmap itself directly rather than hint.

Brief patch description:
 1. bugfix for is_removable() check. I think this should be back ported.
 2. bugfix for callback at counting immobile pages.
    I think the old logic rarely hits this bug..so, not necessary to backport.
 3. the unified new logic for is_remobable.

Only patch1 is CCed to stable for now and the patch series itself is onto
mmotm-08-27.

Thanks,
-Kame

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