linux-kernel - [PATCH 0/3] thp: tidy and fix khugepaged_prealloc

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Message-ID: <50508632.9090003@linux.vnet.ibm.com>
Date:	Wed, 12 Sep 2012 20:55:14 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Hugh Dickins <hughd@...gle.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] thp: tidy and fix khugepaged_prealloc_page

There has a bug in khugepaged_prealloc_page, the page-alloc
indicator is not reset if the previous page request is failed,
then it will trigger the VM_BUG_ON in khugepaged_alloc_page.
It is fixed by the first patch which need not be back port for
it was introduced by recent commit. (sorry for that)

As Hugh pointed out, this are some ugly portions:
- releasing mmap_sem lock is hidden in khugepaged_alloc_page
- page is freed in khugepaged_prealloc_page
The later two patches try to fix these issues.

Hugh,

If any point i missed, please let me know, and sorry to waste
your time on my broken patch.

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