linux-kernel - [PATCH v2 0/6] Avoid cache trashing on clearing huge/gigantic page

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Message-Id: <1344524583-1096-1-git-send-email-kirill.shutemov@linux.intel.com>
Date:	Thu,  9 Aug 2012 18:02:57 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	linux-mm@...ck.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Alex Shi <alex.shu@...el.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Robert Richter <robert.richter@....com>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-mips@...ux-mips.org,
	linux-sh@...r.kernel.org, sparclinux@...r.kernel.org
Subject: [PATCH v2 0/6] Avoid cache trashing on clearing huge/gigantic page

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

Clearing a 2MB huge page will typically blow away several levels of CPU
caches.  To avoid this only cache clear the 4K area around the fault
address and use a cache avoiding clears for the rest of the 2MB area.

This patchset implements cache avoiding version of clear_page only for
x86. If an architecture wants to provide cache avoiding version of
clear_page it should to define ARCH_HAS_USER_NOCACHE to 1 and implement
clear_page_nocache() and clear_user_highpage_nocache().

v2:
  - No code change. Only commit messages are updated.
  - RFC mark is dropped.

Andi Kleen (6):
  THP: Use real address for NUMA policy
  mm: make clear_huge_page tolerate non aligned address
  THP: Pass real, not rounded, address to clear_huge_page
  x86: Add clear_page_nocache
  mm: make clear_huge_page cache clear only around the fault address
  x86: switch the 64bit uncached page clear to SSE/AVX v2

 arch/x86/include/asm/page.h          |    2 +
 arch/x86/include/asm/string_32.h     |    5 ++
 arch/x86/include/asm/string_64.h     |    5 ++
 arch/x86/lib/Makefile                |    1 +
 arch/x86/lib/clear_page_nocache_32.S |   30 +++++++++++
 arch/x86/lib/clear_page_nocache_64.S |   92 ++++++++++++++++++++++++++++++++++
 arch/x86/mm/fault.c                  |    7 +++
 mm/huge_memory.c                     |   17 +++---
 mm/memory.c                          |   29 ++++++++++-
 9 files changed, 178 insertions(+), 10 deletions(-)
 create mode 100644 arch/x86/lib/clear_page_nocache_32.S
 create mode 100644 arch/x86/lib/clear_page_nocache_64.S

-- 
1.7.7.6

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