From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: linux-mm@kvack.org
Cc: linux-mips@linux-mips.org, linux-sh@vger.kernel.org,
Jan Beulich <jbeulich@novell.com>,
"H. Peter Anvin" <hpa@zytor.com>,
sparclinux@vger.kernel.org,
Andrea Arcangeli <aarcange@redhat.com>,
Andi Kleen <ak@linux.intel.com>,
Robert Richter <robert.richter@amd.com>,
x86@kernel.org, Hugh Dickins <hughd@google.com>,
Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
Alex Shi <alex.shu@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@amacapital.net>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH v2 0/6] Avoid cache trashing on clearing huge/gigantic page
Date: Thu, 9 Aug 2012 18:02:57 +0300 [thread overview]
Message-ID: <1344524583-1096-1-git-send-email-kirill.shutemov@linux.intel.com> (raw)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.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
next reply other threads:[~2012-08-09 15:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-09 15:02 Kirill A. Shutemov [this message]
2012-08-09 15:02 ` [PATCH v2 1/6] THP: Use real address for NUMA policy Kirill A. Shutemov
2012-08-09 15:02 ` [PATCH v2 2/6] mm: make clear_huge_page tolerate non aligned address Kirill A. Shutemov
2012-08-09 15:03 ` [PATCH v2 3/6] THP: Pass real, not rounded, address to clear_huge_page Kirill A. Shutemov
2012-08-09 15:03 ` [PATCH v2 4/6] x86: Add clear_page_nocache Kirill A. Shutemov
2012-08-09 15:22 ` Jan Beulich
2012-08-13 11:43 ` Kirill A. Shutemov
2012-08-13 12:02 ` Jan Beulich
2012-08-13 16:27 ` Andi Kleen
2012-08-13 17:04 ` Borislav Petkov
2012-08-13 19:07 ` Kirill A. Shutemov
2012-08-09 15:23 ` H. Peter Anvin
2012-08-09 15:03 ` [PATCH v2 5/6] mm: make clear_huge_page cache clear only around the fault address Kirill A. Shutemov
2012-08-09 15:03 ` [PATCH v2 6/6] x86: switch the 64bit uncached page clear to SSE/AVX v2 Kirill A. Shutemov
2012-08-09 15:28 ` Jan Beulich
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