linux-kernel - Re: [PATCH] mm/hugetlbfs: Unmap pages if page fault raced with hole punch

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Date:	Mon, 11 Jan 2016 17:36:43 -0800
From:	Mike Kravetz <mike.kravetz@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH] mm/hugetlbfs: Unmap pages if page fault raced with hole
 punch

On 01/11/2016 04:29 PM, Andrew Morton wrote:
> On Mon, 11 Jan 2016 15:38:40 -0800 Mike Kravetz <mike.kravetz@...cle.com> wrote:
> 
>> On 01/11/2016 02:35 PM, Andrew Morton wrote:
>>> On Wed,  6 Jan 2016 14:37:04 -0800 Mike Kravetz <mike.kravetz@...cle.com> wrote:

<snip>

>>>> The (unmodified) routine hugetlb_vmdelete_list was moved ahead of
>>>> remove_inode_hugepages to satisfy the new reference.
>>>>

<snip>

> 
> I'll mark this patch as "pending, awaiting Mike's go-ahead".
> 

When this patch was originally submitted, bugs were discovered in the
hugetlb_vmdelete_list routine.  So, the patch "Fix bugs in
hugetlb_vmtruncate_list" was created.

I have retested the changes in this patch specifically dealing with
page fault/hole punch race on top of the new hugetlb_vmtruncate_list
routine.  Everything looks good.

How would you like to proceed with the patch?
- Should I create a series with the hugetlb_vmtruncate_list split out?
- Should I respin with hugetlb_vmtruncate_list patch applied?

Just let me know what is easiest/best for you.
-- 
Mike Kravetz