linux-kernel - [PATCH 0/3] Virtual huge zero page

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Date:	Sat, 29 Sep 2012 02:37:18 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...nel.org>,
	linux-arch@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 0/3] Virtual huge zero page

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

Here's alternative implementation of huge zero page: virtual huge zero
page.

Virtual huge zero page is a PMD table with all entries set to zero page.
H. Peter Anvin asked to evaluate this implementation option.

Pros:
 - cache friendly (not yet benchmarked);
 - less changes required (if I haven't miss something ;);

Cons:
 - increases TLB pressure;
 - requires per-arch enabling;
 - one more check on handle_mm_fault() path.

At the moment I did only sanity check. Testing is required.

Any opinion?

Kirill A. Shutemov (3):
  asm-generic: introduce pmd_special() and pmd_mkspecial()
  mm, thp: implement virtual huge zero page
  x86: implement HAVE_PMD_SPECAIL

 arch/Kconfig                   |    6 ++++++
 arch/x86/Kconfig               |    1 +
 arch/x86/include/asm/pgtable.h |   14 +++++++++++++-
 include/asm-generic/pgtable.h  |   12 ++++++++++++
 include/linux/mm.h             |    8 ++++++++
 mm/huge_memory.c               |   38 ++++++++++++++++++++++++++++++++++++++
 mm/memory.c                    |   15 ++++++++-------
 7 files changed, 86 insertions(+), 8 deletions(-)

-- 
1.7.7.6

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