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675d995297
linux/arch/powerpc
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Aneesh Kumar K.V 675d995297 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: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-05-15 22:29:12 +10:00
..
boot powerpc: remove retired sbc834x support 2018-05-03 22:32:30 +10:00
configs powerpc/config: powernv_defconfig updates 2018-05-10 23:25:07 +10:00
crypto crypto: hash - annotate algorithms taking optional key 2018-01-12 23:03:35 +11:00
include powerpc/mm: Use page fragments for allocation page table at PMD level 2018-05-15 22:29:12 +10:00
kernel powerpc/prom: Drop support for old FDT versions 2018-05-11 23:29:04 +10:00
kvm Merge branch 'topic/ppc-kvm' into next 2018-05-15 22:28:19 +10:00
lib powerpc/lib: Add alt patching test of branching past the last instruction 2018-05-11 23:29:03 +10:00
math-emu
mm powerpc/mm: Use page fragments for allocation page table at PMD level 2018-05-15 22:29:12 +10:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-05 11:29:24 -08:00
oprofile powerpc: Use sizeof(*foo) rather than sizeof(struct foo) 2018-03-20 16:47:53 +11:00
perf powerpc updates for 4.17 2018-04-07 12:08:19 -07:00
platforms powerpc/book3s64: Enable split pmd ptlock. 2018-05-15 22:29:12 +10:00
purgatory
sysdev powerpc/xive: prepare all hcalls to support long busy delays 2018-05-10 23:25:10 +10:00
tools
xmon Merge branch 'topic/paca' into next 2018-03-31 09:09:36 +11:00
Kconfig powerpc/livepatch: Implement reliable stack tracing for the consistency model 2018-05-10 23:25:12 +10:00
Kconfig.debug powerpc: Add new kconfig CONFIG_PPC_IRQ_SOFT_MASK_DEBUG 2018-01-19 22:37:03 +11:00
Makefile powerpc/64s: Add POWER9 CPU type selection 2018-04-01 22:15:32 +10:00
Makefile.postlink