linux-kernel - [PATCH 0/9] Optimize string operations by enhanced REP MOVSB/STOSB

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Date:	Tue, 17 May 2011 15:29:09 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H Peter Anvin" <hpa@...or.com>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Avi Kivity" <avi@...hat.com>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Andi Kleen" <andi@...stfloor.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 0/9] Optimize string operations by enhanced REP MOVSB/STOSB

From: Fenghua Yu <fenghua.yu@...el.com>

Intel processors are adding enhancements to REP MOVSB/STOSB and the use of
REP MOVSB/STOSB for optimal memcpy/memset or similar functions is recommended.
Enhancement availability is indicated by CPUID.7.0.EBX[9] (Enhanced REP MOVSB/STOSB).

Intel 64 and IA-32 SDM and performance optimization guide may include more model
specific information and how the feature can be used. The documents will be
published soon.

Fenghua Yu (9):
  x86, cpu: Enable enhanced REP MOVSB/STOSB feature
  x86/kernel/cpu/intel.c: Initialize Enhanced REP MOVSB/STOSBenhanced
  x86/kernel/alternative.c: Add comment for applying alternatives order
  x86, alternative-asm.h: Add altinstruction_entry macro
  x86/lib/clear_page_64.S: Support clear_page() with enhanced REP
    MOVSB/STOSB
  x86/lib/copy_user_64.S: Support copy_to_user/copy_from_user by
    enhanced REP MOVSB/STOSB
  x86/lib/memcpy_64.S: Optimize memcpy by enhanced REP MOVSB/STOSB
  x86/lib/memmove_64.S: Optimize memmove by enhanced REP MOVSB/STOSB
  x86/lib/memset_64.S: Optimize memset by enhanced REP MOVSB/STOSB

 arch/x86/include/asm/alternative-asm.h |    9 ++++
 arch/x86/include/asm/cpufeature.h      |    1 +
 arch/x86/kernel/alternative.c          |    9 ++++
 arch/x86/kernel/cpu/intel.c            |   19 +++++++--
 arch/x86/lib/clear_page_64.S           |   33 ++++++++++++----
 arch/x86/lib/copy_user_64.S            |   65 +++++++++++++++++++++++++++-----
 arch/x86/lib/memcpy_64.S               |   45 ++++++++++++++++------
 arch/x86/lib/memmove_64.S              |   29 ++++++++++++++-
 arch/x86/lib/memset_64.S               |   54 ++++++++++++++++++++------
 9 files changed, 215 insertions(+), 49 deletions(-)

-- 
1.7.2

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