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0fa5bc4023
linux/mm
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Joao Martins 0fa5bc4023 mm/hugetlb: grab head page refcount once for group of subpages 
Patch series "mm/hugetlb: follow_hugetlb_page() improvements", v2.

While looking at ZONE_DEVICE struct page reuse particularly the last
patch[0], I found two possible improvements for follow_hugetlb_page()
which is solely used for get_user_pages()/pin_user_pages().

The first patch batches page refcount updates while the second tidies up
storing the subpages/vmas.  Both together bring the cost of slow variant
of gup() cost from ~87.6k usecs to ~5.8k usecs.

libhugetlbfs tests seem to pass as well gup_test benchmarks with hugetlbfs
vmas.

This patch (of 2):

follow_hugetlb_page() once it locks the pmd/pud, checks all its N subpages
in a huge page and grabs a reference for each one.  Similar to gup-fast,
have follow_hugetlb_page() grab the head page refcount only after counting
all its subpages that are part of the just faulted huge page.

Consequently we reduce the number of atomics necessary to pin said huge
page, which improves non-fast gup() considerably:

  - 16G with 1G huge page size
  gup_test -f /mnt/huge/file -m 16384 -r 10 -L -S -n 512 -w

PIN_LONGTERM_BENCHMARK: ~87.6k us -> ~12.8k us

Link: https://lkml.kernel.org/r/20210128182632.24562-1-joao.m.martins@oracle.com
Link: https://lkml.kernel.org/r/20210128182632.24562-2-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-02-24 13:38:32 -08:00
..
kasan kasan: fix bug detection via ksize for HW_TAGS mode 2021-02-24 13:38:31 -08:00
backing-dev.c mm: backing-dev: Remove duplicated macro definition 2021-02-24 13:38:28 -08:00
balloon_compaction.c
cleancache.c
cma_debug.c debugfs: make sure we can remove u32_array files cleanly 2020-07-10 13:54:00 -07:00
cma.c mm: cma: improve pr_debug log in cma_release() 2020-12-15 12:13:46 -08:00
cma.h mm: cma: use CMA_MAX_NAME to define the length of cma name array 2020-09-01 09:19:43 +02:00
compaction.c mm, compaction: move high_pfn to the for loop scope 2021-02-05 11:03:47 -08:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable/basic: iterate over entire protection_map[] 2021-02-24 13:38:27 -08:00
debug.c mm/debug: improve memcg debugging 2021-02-24 13:38:27 -08:00
dmapool.c mm/dmapool.c: replace hard coded function name with __func__ 2020-10-13 18:38:32 -07:00
early_ioremap.c
fadvise.c mm, fadvise: improve the expensive remote LRU cache draining after FADV_DONTNEED 2020-10-13 18:38:29 -07:00
failslab.c
filemap.c mm: memcontrol: convert NR_SHMEM_THPS account to pages 2021-02-24 13:38:29 -08:00
frontswap.c mm/frontswap: mark various intentional data races 2020-08-14 19:56:56 -07:00
gup_test.c mm/gup_test.c: mark gup_test_init as __init function 2020-12-15 12:13:38 -08:00
gup_test.h selftests/vm: gup_test: introduce the dump_pages() sub-test 2020-12-15 12:13:38 -08:00
gup.c mm/hugetlb: grab head page refcount once for group of subpages 2021-02-24 13:38:32 -08:00
highmem.c mm/highmem: prepare for overriding set_pte_at() 2021-01-24 10:34:52 -08:00
hmm.c mm: do page fault accounting in handle_mm_fault 2020-08-12 10:58:02 -07:00
huge_memory.c mm/huge_memory.c: update tlb entry if pmd is changed 2021-02-24 13:38:32 -08:00
hugetlb_cgroup.c hugetlb_cgroup: fix offline of hugetlb cgroup with reservations 2020-12-06 10:19:07 -08:00
hugetlb.c mm/hugetlb: grab head page refcount once for group of subpages 2021-02-24 13:38:32 -08:00
hwpoison-inject.c mm,hwpoison-inject: don't pin for hwpoison_filter 2020-10-16 11:11:16 -07:00
init-mm.c mm/gup: prevent gup_fast from racing with COW during fork 2020-12-15 12:13:39 -08:00
internal.h mm, page_alloc: disable pcplists during memory offline 2020-12-15 12:13:43 -08:00
interval_tree.c
ioremap.c mm: move p?d_alloc_track to separate header file 2020-08-07 11:33:26 -07:00
Kconfig media: videobuf2: Move frame_vector into media subsystem 2021-01-12 14:15:31 +01:00
Kconfig.debug mm, page_poison: remove CONFIG_PAGE_POISONING_ZERO 2020-12-15 12:13:46 -08:00
khugepaged.c mm: memcontrol: convert NR_SHMEM_THPS account to pages 2021-02-24 13:38:29 -08:00
kmemleak.c mm/kmemleak: rely on rcu for task stack scanning 2020-10-13 18:38:27 -07:00
ksm.c mm: cleanup kstrto*() usage 2020-12-15 12:13:47 -08:00
list_lru.c mm/list_lru.c: remove kvfree_rcu_local() 2021-02-24 13:38:30 -08:00
maccess.c uaccess: add force_uaccess_{begin,end} helpers 2020-08-12 10:57:59 -07:00
madvise.c idmapped-mounts-v5.12 2021-02-23 13:39:45 -08:00
Makefile media: videobuf2: Move frame_vector into media subsystem 2021-01-12 14:15:31 +01:00
mapping_dirty_helpers.c mm/mapping_dirty_helpers: enhance the kernel-doc markups 2020-12-15 12:13:41 -08:00
memblock.c memblock: remove return value of memblock_free_all() 2021-02-22 13:01:23 -08:00
memcontrol.c mm: memcontrol: fix get_active_memcg return value 2021-02-24 13:38:30 -08:00
memfd.c
memory_hotplug.c mm: rename memmap_init() and memmap_init_zone() 2021-02-24 13:38:31 -08:00
memory-failure.c mm,hwpoison: send SIGBUS to PF_MCE_EARLY processes on action required events 2021-02-24 13:38:32 -08:00
memory.c mm/memory.c: fix potential pte_unmap_unlock pte error 2021-02-24 13:38:30 -08:00
mempolicy.c mm: migrate: initialize err in do_migrate_pages 2021-01-12 18:12:54 -08:00
mempool.c kasan: move _RET_IP_ to inline wrappers 2021-02-24 13:38:31 -08:00
memremap.c mm/mremap_pages: fix static key devmap_managed_key updates 2020-11-02 12:14:18 -08:00
memtest.c
migrate.c mm: memcg: add swapcache stat for memcg v2 2021-02-24 13:38:29 -08:00
mincore.c inode: make init and permission helpers idmapped mount aware 2021-01-24 14:27:16 +01:00
mlock.c mm/lru: introduce relock_page_lruvec() 2020-12-15 14:48:04 -08:00
mm_init.c mm: fix fall-through warnings for Clang 2020-12-15 12:13:47 -08:00
mmap_lock.c mm: mmap_lock: add tracepoints around lock acquisition 2020-12-15 12:13:41 -08:00
mmap.c mm/mmap.c: remove unnecessary local variable 2021-02-24 13:38:30 -08:00
mmu_gather.c tlb: mmu_gather: Remove start/end arguments from tlb_gather_mmu() 2021-01-29 20:02:29 +01:00
mmu_notifier.c mm: track mmu notifiers in fs_reclaim_acquire/release 2020-12-15 12:13:41 -08:00
mmzone.c mm/lru: replace pgdat lru_lock with lruvec lock 2020-12-15 14:48:04 -08:00
mprotect.c mm/mprotect.c: optimize error detection in do_mprotect_pkey() 2021-02-24 13:38:30 -08:00
mremap.c mm: mremap: unlink anon_vmas when mremap with MREMAP_DONTUNMAP success 2021-02-24 13:38:30 -08:00
msync.c
nommu.c mm/nommu: Fix return type of filemap_map_pages() 2021-01-28 14:10:31 +00:00
oom_kill.c tlb: mmu_gather: Remove start/end arguments from tlb_gather_mmu() 2021-01-29 20:02:29 +01:00
page_alloc.c mm: simplify free_highmem_page() and free_reserved_page() 2021-02-24 13:38:32 -08:00
page_counter.c mm/page_counter: use page_counter_read in page_counter_set_max 2020-12-15 12:13:40 -08:00
page_ext.c mm: fix some spelling mistakes in comments 2020-12-15 22:46:19 -08:00
page_idle.c mm: page_idle_get_page() does not need lru_lock 2020-12-15 14:48:03 -08:00
page_io.c mm/page_io: use pr_alert_ratelimited for swap read/write errors 2021-02-24 13:38:29 -08:00
page_isolation.c mm/page_isolation: do not isolate the max order page 2020-12-15 12:13:45 -08:00
page_owner.c mm/page_owner: use helper function zone_end_pfn() to get end_pfn 2021-02-24 13:38:27 -08:00
page_poison.c kasan, mm: reset tags when accessing metadata 2020-12-22 12:55:08 -08:00
page_reporting.c mm/page_reporting: use list_entry_is_head() in page_reporting_cycle() 2021-02-24 13:38:30 -08:00
page_reporting.h
page_vma_mapped.c mm/page_vma_mapped.c: add colon to fix kernel-doc markups error for check_pte 2020-12-15 12:13:41 -08:00
page-writeback.c mm: make wait_on_page_writeback() wait for multiple pending writebacks 2021-01-05 11:33:00 -08:00
pagewalk.c
percpu-internal.h mm: memcg/percpu: account percpu memory to memory cgroups 2020-08-12 10:57:55 -07:00
percpu-km.c mm: memcg/percpu: account percpu memory to memory cgroups 2020-08-12 10:57:55 -07:00
percpu-stats.c mm: memcg/percpu: account percpu memory to memory cgroups 2020-08-12 10:57:55 -07:00
percpu-vm.c mm: memcg/percpu: account percpu memory to memory cgroups 2020-08-12 10:57:55 -07:00
percpu.c percpu: fix clang modpost section mismatch 2021-02-14 18:15:15 +00:00
pgalloc-track.h mm: move p?d_alloc_track to separate header file 2020-08-07 11:33:26 -07:00
pgtable-generic.c mm/pgtable-generic.c: optimize the VM_BUG_ON condition in pmdp_huge_clear_flush() 2021-02-24 13:38:30 -08:00
process_vm_access.c mm/process_vm_access.c: include compat.h 2021-01-12 18:12:54 -08:00
ptdump.c kasan, arm64: expand CONFIG_KASAN checks 2020-12-22 12:55:08 -08:00
readahead.c mm: use limited read-ahead to satisfy read 2020-10-17 13:49:08 -06:00
rmap.c mm: rmap: explicitly reset vma->anon_vma in unlink_anon_vmas() 2021-02-24 13:38:30 -08:00
rodata_test.c mm/rodata_test.c: fix missing function declaration 2020-08-21 09:52:53 -07:00
shmem.c mm: memcontrol: convert NR_SHMEM_THPS account to pages 2021-02-24 13:38:29 -08:00
shuffle.c mm: rename page_order() to buddy_order() 2020-10-16 11:11:19 -07:00
shuffle.h mm/shuffle: remove dynamic reconfiguration 2020-08-07 11:33:29 -07:00
slab_common.c kasan: fix bug detection via ksize for HW_TAGS mode 2021-02-24 13:38:31 -08:00
slab.c kasan: move _RET_IP_ to inline wrappers 2021-02-24 13:38:31 -08:00
slab.h mm: memcg/slab: pre-allocate obj_cgroups for slab caches with SLAB_ACCOUNT 2021-02-24 13:38:29 -08:00
slob.c mm, tracing: record slab name for kmem_cache_free() 2021-02-24 13:38:26 -08:00
slub.c kasan: move _RET_IP_ to inline wrappers 2021-02-24 13:38:31 -08:00
sparse-vmemmap.c mm/sparse: only sub-section aligned range would be populated 2020-08-07 11:33:27 -07:00
sparse.c mm/memory_hotplug: guard more declarations by CONFIG_MEMORY_HOTPLUG 2020-10-16 11:11:18 -07:00
swap_cgroup.c
swap_slots.c mm/swap_slots.c: remove redundant NULL check 2021-02-24 13:38:28 -08:00
swap_state.c mm: memcg: add swapcache stat for memcg v2 2021-02-24 13:38:29 -08:00
swap.c mm/lru: introduce relock_page_lruvec() 2020-12-15 14:48:04 -08:00
swapfile.c mm/swapfile.c: fix debugging information problem 2021-02-24 13:38:28 -08:00
truncate.c mm: fix kernel-doc markups 2020-12-15 12:13:47 -08:00
usercopy.c mm/usercopy.c: delete duplicated word 2020-08-12 10:57:58 -07:00
userfaultfd.c mm/vmscan: protect the workingset on anonymous LRU 2020-08-12 10:57:55 -07:00
util.c mm: Make mem_dump_obj() handle vmalloc() memory 2021-01-22 15:24:04 -08:00
vmacache.c
vmalloc.c Merge branch 'for-mingo-rcu' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu 2021-02-12 12:56:55 +01:00
vmpressure.c
vmscan.c mm: don't put pinned pages into the swap cache 2021-01-17 12:08:04 -08:00
vmstat.c mm: memcg: add swapcache stat for memcg v2 2021-02-24 13:38:29 -08:00
workingset.c Merge branch 'akpm' (patches from Andrew) 2020-12-15 14:55:10 -08:00
z3fold.c z3fold: remove preempt disabled sections for RT 2020-12-15 12:13:45 -08:00
zbud.c mm/zbud: remove redundant initialization 2020-10-13 18:38:34 -07:00
zpool.c mm/zpool.c: delete duplicated word and fix grammar 2020-08-12 10:57:58 -07:00
zsmalloc.c mm/zsmalloc.c: rework the list_add code in insert_zspage() 2020-12-15 12:13:46 -08:00
zswap.c mm/zswap: move to use crypto_acomp API for hardware acceleration 2020-12-15 12:13:46 -08:00