提交 675d9952 编写于 作者: A Aneesh Kumar K.V 提交者: Michael Ellerman

powerpc/book3s64: Enable split pmd ptlock.

Testing with a threaded version of mmap_bench which allocate 1G chunks and
with large number of threads we find:

without patch

    32.72%  mmap_bench  [kernel.vmlinux]            [k] do_raw_spin_lock
            |
            ---do_raw_spin_lock
               |
                --32.68%--0
                          |
                          |--15.82%--pte_fragment_alloc
                          |          |
                          |           --15.79%--do_huge_pmd_anonymous_page
                          |                     __handle_mm_fault
                          |                     handle_mm_fault
                          |                     __do_page_fault
                          |                     handle_page_fault
                          |                     test_mmap
                          |                     test_mmap
                          |                     start_thread
                          |                     __clone
                          |
                          |--14.95%--do_huge_pmd_anonymous_page
                          |          __handle_mm_fault
                          |          handle_mm_fault
                          |          __do_page_fault
                          |          handle_page_fault
                          |          test_mmap
                          |          test_mmap
                          |          start_thread
                          |          __clone
                          |

with patch

    12.89%  mmap_bench  [kernel.vmlinux]            [k] do_raw_spin_lock
            |
            ---do_raw_spin_lock
               |
                --12.83%--0
                          |
                          |--3.21%--pagevec_lru_move_fn
                          |          __lru_cache_add
                          |          |
                          |           --2.74%--do_huge_pmd_anonymous_page
                          |                     __handle_mm_fault
                          |                     handle_mm_fault
                          |                     __do_page_fault
                          |                     handle_page_fault
                          |                     test_mmap
                          |                     test_mmap
                          |                     start_thread
                          |                     __clone
                          |
                          |--3.11%--do_huge_pmd_anonymous_page
                          |          __handle_mm_fault
                          |          handle_mm_fault
                          |          __do_page_fault
                          |          handle_page_fault
                          |          test_mmap
                          |          test_mmap
                          |          start_thread
                          |          __clone

.....
                          |
                           --0.55%--pte_fragment_alloc
                                     |
                                      --0.55%--do_huge_pmd_anonymous_page
                                                __handle_mm_fault
                                                handle_mm_fault
                                                __do_page_fault
                                                handle_page_fault
                                                test_mmap
                                                test_mmap
                                                start_thread
                                                __clone
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
上级 738f9645
......@@ -292,6 +292,10 @@ config PPC_STD_MMU_32
def_bool y
depends on PPC_STD_MMU && PPC32
config ARCH_ENABLE_SPLIT_PMD_PTLOCK
def_bool y
depends on PPC_BOOK3S_64
config PPC_RADIX_MMU
bool "Radix MMU Support"
depends on PPC_BOOK3S_64
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册