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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2018-04-16 14:27:24 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-05-15 15:29:12 +0300 |
| commit | 675d995297d42f69484100516cd30a71d25f4c7c (patch) | |
| tree | 02cc7214221142ad74b234dc41e4f536f4d3592c /arch/powerpc/platforms | |
| parent | 738f9645550ea6887f119e44dc479821e44571bd (diff) | |
| download | linux-675d995297d42f69484100516cd30a71d25f4c7c.tar.xz | |
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>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 67d3125d0610..cc892dcfa114 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -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 |