| From: |
| "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> |
| To: |
| Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>, linux-mm@kvack.org,
"H. Peter Anvin" <hpa@linux.intel.com> |
| Subject: |
| [PATCH 0/3] Virtual huge zero page |
| Date: |
| Sat, 29 Sep 2012 02:37:18 +0300 |
| Message-ID: |
| <1348875441-19561-1-git-send-email-kirill.shutemov@linux.intel.com> |
| Cc: |
| Andi Kleen <ak@linux.intel.com>, linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Arnd Bergmann <arnd@arndb.de>, Ingo Molnar <mingo@kernel.org>,
linux-arch@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> |
| Archive‑link: | |
Article |
From: "Kirill A. Shutemov" <kirill.shutemov@linux.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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