From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
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().
v4:
- vm.clear_huge_page_nocache sysctl;
- rework page iteration in clear_{huge,gigantic}_page according to
Andrea Arcangeli suggestion;
v3:
- Rebased to current Linus' tree. kmap_atomic() build issue is fixed;
- Pass fault address to clear_huge_page(). v2 had problem with clearing
for sizes other than HPAGE_SIZE;
- x86: fix 32bit variant. Fallback version of clear_page_nocache() has
been added for non-SSE2 systems;
- x86: clear_page_nocache() moved to clear_page_{32,64}.S;
- x86: use pushq_cfi/popq_cfi instead of push/pop;
v2:
- No code change. Only commit messages are updated;
- RFC mark is dropped;
Andi Kleen (5):
THP: Use real address for NUMA policy
THP: Pass fault address to __do_huge_pmd_anonymous_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
Kirill A. Shutemov (3):
hugetlb: pass fault address to hugetlb_no_page()
mm: pass fault address to clear_huge_page()
mm: implement vm.clear_huge_page_nocache sysctl
Documentation/sysctl/vm.txt | 13 ++++++
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 | 3 +-
arch/x86/lib/clear_page_32.S | 72 +++++++++++++++++++++++++++++++++++
arch/x86/lib/clear_page_64.S | 78 ++++++++++++++++++++++++++++++++++++++
arch/x86/mm/fault.c | 7 +++
include/linux/mm.h | 7 +++-
kernel/sysctl.c | 12 ++++++
mm/huge_memory.c | 17 ++++----
mm/hugetlb.c | 39 ++++++++++---------
mm/memory.c | 72 ++++++++++++++++++++++++++++++----
13 files changed, 294 insertions(+), 38 deletions(-)
create mode 100644 arch/x86/lib/clear_page_32.S
--
1.7.7.6
