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From: Michal Hocko <mhocko@kernel.org>
To: linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	LKML <linux-kernel@vger.kernel.org>,
	joonsoo kim <js1304@gmail.com>,
	linux-api@vger.kernel.org, Michal Hocko <mhocko@suse.com>,
	Shaohua Li <shaohua.li@intel.com>, Toshi Kani <toshi.kani@hp.com>,
	Wen Congyang <wency@cn.fujitsu.com>
Subject: [PATCH 0/9] cleanup zonelists initialization
Date: Fri, 14 Jul 2017 09:59:57 +0200
Message-ID: <20170714080006.7250-1-mhocko@kernel.org> (raw)

Hi,
this is aimed at cleaning up the zonelists initialization code we have
but the primary motivation was bug report [1] which got resolved but
the usage of stop_machine is just too ugly to live. Most patches are
straightforward but 3 of them need a special consideration.

Patch 1 removes zone ordered zonelists completely. I am CCing linux-api
because this is a user visible change. As I argue in the patch
description I do not think we have a strong usecase for it these days.
I have kept sysctl in place and warn into the log if somebody tries to
configure zone lists ordering. If somebody has a real usecase for it
we can revert this patch but I do not expect anybody will actually notice
runtime differences. This patch is not strictly needed for the rest but
it made patch 6 easier to implement.

Patch 7 removes stop_machine from build_all_zonelists without adding any
special synchronization between iterators and updater which I _believe_
is acceptable as explained in the changelog. I hope I am not missing
anything.

Patch 8 then removes zonelists_mutex which is kind of ugly as well and
not really needed AFAICS but a care should be taken when double checking
my thinking.

This has passed my light testing but I currently do not have a HW to
test hotadd_new_pgdat path (aka a completely new node added to the
system in runtime).

This is based on the current mmomt git tree (mmotm-2017-07-12-15-11).
Any feedback is highly appreciated.

The diffstat looks really promissing
 include/linux/mmzone.h |   3 +-
 init/main.c            |   2 +-
 kernel/sysctl.c        |   2 -
 mm/internal.h          |   1 +
 mm/memory_hotplug.c    |  27 +----
 mm/page_alloc.c        | 293 ++++++++++++-------------------------------------
 mm/page_ext.c          |   5 +-
 mm/sparse-vmemmap.c    |  11 +-
 mm/sparse.c            |  10 +-
 9 files changed, 89 insertions(+), 265 deletions(-)

Shortlog says
Michal Hocko (9):
      mm, page_alloc: rip out ZONELIST_ORDER_ZONE
      mm, page_alloc: remove boot pageset initialization from memory hotplug
      mm, page_alloc: do not set_cpu_numa_mem on empty nodes initialization
      mm, memory_hotplug: drop zone from build_all_zonelists
      mm, memory_hotplug: remove explicit build_all_zonelists from try_online_node
      mm, page_alloc: simplify zonelist initialization
      mm, page_alloc: remove stop_machine from build_all_zonelists
      mm, memory_hotplug: get rid of zonelists_mutex
      mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations

[1] http://lkml.kernel.org/r/alpine.DEB.2.20.1706291803380.1861@nanos

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Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-14  7:59 Michal Hocko [this message]
2017-07-14  7:59 ` [PATCH 1/9] mm, page_alloc: rip out ZONELIST_ORDER_ZONE Michal Hocko
2017-07-14  9:36   ` Mel Gorman
2017-07-14 10:47     ` Michal Hocko
2017-07-14 11:16       ` Mel Gorman
2017-07-14 11:38         ` Michal Hocko
2017-07-14 12:56           ` Mel Gorman
2017-07-14 13:01             ` Mel Gorman
2017-07-14 13:08             ` Michal Hocko
2017-07-19  9:33   ` Vlastimil Babka
2017-07-19 13:44     ` Michal Hocko
2017-07-14  7:59 ` [PATCH 2/9] mm, page_alloc: remove boot pageset initialization from memory hotplug Michal Hocko
2017-07-14  9:39   ` Mel Gorman
2017-07-19 13:15   ` Vlastimil Babka
2017-07-14  8:00 ` [PATCH 3/9] mm, page_alloc: do not set_cpu_numa_mem on empty nodes initialization Michal Hocko
2017-07-14  9:48   ` Mel Gorman
2017-07-14 10:50     ` Michal Hocko
2017-07-14 12:32       ` Mel Gorman
2017-07-14 12:39         ` Michal Hocko
2017-07-14 12:56           ` Mel Gorman
2017-07-19 13:19   ` Vlastimil Babka
2017-07-14  8:00 ` [PATCH 4/9] mm, memory_hotplug: drop zone from build_all_zonelists Michal Hocko
2017-07-19 13:33   ` Vlastimil Babka
2017-07-20  8:15     ` Michal Hocko
2017-07-14  8:00 ` [PATCH 5/9] mm, memory_hotplug: remove explicit build_all_zonelists from try_online_node Michal Hocko
2017-07-14 12:14   ` Michal Hocko
2017-07-20  6:13   ` Vlastimil Babka
2017-07-14  8:00 ` [PATCH 6/9] mm, page_alloc: simplify zonelist initialization Michal Hocko
2017-07-14  9:55   ` Mel Gorman
2017-07-14 10:51     ` Michal Hocko
2017-07-14 12:46   ` Mel Gorman
2017-07-14 13:02     ` Michal Hocko
2017-07-14 14:18       ` Mel Gorman
2017-07-17  6:06         ` Michal Hocko
2017-07-17  8:07           ` Mel Gorman
2017-07-17  8:19             ` Michal Hocko
2017-07-17  8:58               ` Mel Gorman
2017-07-17  9:15                 ` Michal Hocko
2017-07-20  6:55   ` Vlastimil Babka
2017-07-20  7:19     ` Michal Hocko
2017-07-14  8:00 ` [PATCH 7/9] mm, page_alloc: remove stop_machine from build_all_zonelists Michal Hocko
2017-07-14  9:59   ` Mel Gorman
2017-07-14 11:00     ` Michal Hocko
2017-07-14 12:47       ` Mel Gorman
2017-07-14 11:29   ` Vlastimil Babka
2017-07-14 11:43     ` Michal Hocko
2017-07-14 11:45       ` Michal Hocko
2017-07-20  6:16         ` Vlastimil Babka
2017-07-20  7:24   ` Vlastimil Babka
2017-07-20  9:21     ` Michal Hocko
2017-07-14  8:00 ` [PATCH 8/9] mm, memory_hotplug: get rid of zonelists_mutex Michal Hocko
2017-07-14  8:00 ` [PATCH 9/9] mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations Michal Hocko
2017-07-20  8:04   ` Vlastimil Babka

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