powerpc/mm/book3s64: Support for split pmd ptlock
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- v1 Latest11 patches 2 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/11 | powerpc/mm/book3s64: Move book3s64 code to pgtable-book3s64arch/ arch/ | +54 | 1 reply | |
| 2/11 | powerpc/kvm: Switch kvm pmd allocator to custom allocatorarch/ | +31 | 0 replies | |
| 3/11 | powerpc/mm: Use pmd_lockptr instead of opencoding itarch/ arch/ arch/ | +8 | 0 replies | |
| 4/11 | powerpc/mm: Rename pte fragment functionsarch/ | +5 | 0 replies | |
| 5/11 | powerpc/mm/book3e/64: Remove unsupported 64Kpage size from 64bit bookearch/ arch/ arch/ +1 more | +4 | 0 replies | |
| 6/11 | powerpc/mm/nohash: Remove pte fragment dependency from nohasharch/ arch/ arch/ | +159 | 0 replies | |
| 7/11 | powerpc/mm/book3s64/4k: Switch 4k pagesize config to use pagetable fragmentarch/ arch/ arch/ +2 more | +15 | 0 replies | |
| 8/11 | powerpc/book3s64/mm: Simplify the rcu callback for page table freearch/ arch/ arch/ | +41 | 0 replies | |
| 9/11 | powerpc/mm: Implement helpers for pagetable fragment support at PMD levelarch/ arch/ arch/ +8 more | +144 | 0 replies | |
| 10/11 | powerpc/mm: Use page fragments for allocation page table at PMD levelarch/ arch/ arch/ +4 more | +6 | 0 replies | |
| 11/11 | powerpc/book3s64: Enable split pmd ptlock.arch/ | +4 | 0 replies |
Reviews trailers per patch
None of the 11 patches has a Reviewed-by or Acked-by.
| Patch | Christophe Leroy |
|---|---|
| Series | T-b |
| 1/11 | |
| 2/11 | |
| 3/11 | |
| 4/11 | |
| 5/11 | |
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| 7/11 | |
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| 11/11 |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH V1 00/11] powerpc/mm/book3s64: Support for split pmd ptlock
This patch series add split pmd pagetable lock for book3s64. nohash64 also should be able to switch to this. I need to workout the code dependency. This series also migh have broken the build on platforms otherthan book3s64. I am sending this early to get feedback on whether we should continue with the approach.
We switch the pmd allocator to use something similar to what we already use for level 4 pagetable allocation. We get an order 0 page and divide that to fragments and hand over fragments when we get request for a pmd pagetable. The pmd lock is now stashed in the struct page backing the allocated page.
The series helps in reducing lock contention on mm->page_table_lock.
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
__cloneAneesh Kumar K.V (11):
powerpc/mm/book3s64: Move book3s64 code to pgtable-book3s64 powerpc/kvm: Switch kvm pmd allocator to custom allocator powerpc/mm: Use pmd_lockptr instead of opencoding it powerpc/mm: Rename pte fragment functions powerpc/mm/book3e/64: Remove unsupported 64Kpage size from 64bit booke powerpc/mm/nohash: Remove pte fragment dependency from nohash powerpc/mm/book3s64/4k: Switch 4k pagesize config to use pagetable
fragment
powerpc/book3s64/mm: Simplify the rcu callback for page table free powerpc/mm: Implement helpers for pagetable fragment support at PMD
level
powerpc/mm: Use page fragments for allocation page table at PMD level powerpc/book3s64: Enable split pmd ptlock.
arch/powerpc/include/asm/book3s/64/hash-4k.h | 8 +- arch/powerpc/include/asm/book3s/64/hash-64k.h | 7 + arch/powerpc/include/asm/book3s/64/hash.h | 10 - arch/powerpc/include/asm/book3s/64/mmu.h | 7 +- arch/powerpc/include/asm/book3s/64/pgalloc.h | 46 +--- arch/powerpc/include/asm/book3s/64/pgtable.h | 20 +- arch/powerpc/include/asm/book3s/64/radix-4k.h | 3 + arch/powerpc/include/asm/book3s/64/radix-64k.h | 4 + arch/powerpc/include/asm/mmu-book3e.h | 6 - arch/powerpc/include/asm/nohash/64/pgalloc.h | 95 +++----- arch/powerpc/include/asm/nohash/64/pgtable-64k.h | 57 ----- arch/powerpc/include/asm/nohash/64/pgtable.h | 8 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 36 ++- arch/powerpc/mm/hash_utils_64.c | 3 +- arch/powerpc/mm/mmu_context_book3s64.c | 39 +++- arch/powerpc/mm/pgtable-book3s64.c | 267 ++++++++++++++++++++++- arch/powerpc/mm/pgtable-hash64.c | 8 +- arch/powerpc/mm/pgtable-radix.c | 5 +- arch/powerpc/mm/pgtable_64.c | 171 --------------- arch/powerpc/platforms/Kconfig.cputype | 4 + 20 files changed, 427 insertions(+), 377 deletions(-) delete mode 100644 arch/powerpc/include/asm/nohash/64/pgtable-64k.h
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