linux-kernel - [PATCH 0/4] NUMA balancing related fixlets

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Date:	Thu,  2 Oct 2014 14:29:14 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Jones <davej@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Michel Lespinasse <walken@...gle.com>,
	Kirill A Shutemov <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/4] NUMA balancing related fixlets

The following is in reaction to the thread "pipe/page fault oddness".
The first patch cleans up a lot of mess related to ARCH_USES_NUMA_PROT_NONE.
It's already in Andrew's tree but included here for context.

The second patch removes a race between migration and mprotect, particularly
from compaction context.

The third patch should have no real effect but it's an oversight that
should be corrected in case MPOL_MF_LAZY is exposed to userspace.

The fourth patch addresses a problem whereby a split_huge_page can leave
a pte_numa PTE in the wrong location and is one potential source of the
bug Dave observed.

Note that none of this prevents a pte_protnone approach being applied on
top or replacing patch 4 with it.  They should not be in conflict but if
patch 4 in particular addresses Dave's problem then it may be considerably
lower risk for 3.17.

 arch/powerpc/include/asm/pgtable.h    | 57 ++++++++---------------------------
 arch/powerpc/include/asm/pte-common.h |  5 +++
 arch/x86/Kconfig                      |  1 -
 arch/x86/include/asm/pgtable_types.h  | 14 +++++++++
 include/asm-generic/pgtable.h         | 27 ++++++-----------
 init/Kconfig                          | 11 -------
 mm/huge_memory.c                      |  2 --
 mm/mempolicy.c                        |  4 ++-
 mm/migrate.c                          |  4 ++-
 9 files changed, 46 insertions(+), 79 deletions(-)

-- 
1.8.4.5

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