linux-kernel - Re: [PATCH 0/11] update page table walker

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Message-Id: <20131015134317.02d819f6905f790007ba1842@linux-foundation.org>
Date:	Tue, 15 Oct 2013 13:43:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Matt Mackall <mpm@...enic.com>,
	Cliff Wickman <cpw@....com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	linux-kernel@...r.kernel.org,
	Thierry Reding <thierry.reding@...il.com>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 0/11] update page table walker

On Mon, 14 Oct 2013 13:36:59 -0400 Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> Page table walker is widely used when you want to traverse page table
> tree and do some work for the entries (and pages pointed to by them.)
> This is a common operation, and keep the code clean and maintainable
> is important. Moreover this patchset introduces caller-specific walk
> control function which is helpful for us to newly introduce page table
> walker to some other users. Core change comes from patch 1, so please
> see it for how it's supposed to work.
> 
> This patchset changes core code in mm/pagewalk.c at first in patch 1 and 2,
> and then updates all of current users to make the code cleaner in patch
> 3-9. Patch 10 changes the interface of hugetlb_entry(), I put it here to
> keep bisectability of the whole patchset. Patch 11 applies page table walker
> to a new user queue_pages_range().

Unfortunately this is very incompatible with pending changes in
fs/proc/task_mmu.c.  Especially Kirill's "mm, thp: change
pmd_trans_huge_lock() to return taken lock".

Stephen will be away for a couple more weeks so I'll get an mmotm
released and hopefully Thierry and Mark will scoop it up(?). 
Alternatively, http://git.cmpxchg.org/?p=linux-mmots.git;a=summary is
up to date.

Please take a look, decide what you think we should do?
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