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Shakeel Butt dd8657b6c1 mm/memcg: optimize memory.numa_stat like memory.stat 
Currently reading memory.numa_stat traverses the underlying memcg tree
multiple times to accumulate the stats to present the hierarchical view of
the memcg tree.  However the kernel already maintains the hierarchical
view of the stats and use it in memory.stat.  Just use the same mechanism
in memory.numa_stat as well.

I ran a simple benchmark which reads root_mem_cgroup's memory.numa_stat
file in the presense of 10000 memcgs.  The results are:

Without the patch:
$ time cat /dev/cgroup/memory/memory.numa_stat > /dev/null

real    0m0.700s
user    0m0.001s
sys     0m0.697s

With the patch:
$ time cat /dev/cgroup/memory/memory.numa_stat > /dev/null

real    0m0.001s
user    0m0.001s
sys     0m0.000s

[akpm@linux-foundation.org: avoid forcing out-of-line code generation]
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Michal Hocko <mhocko@kernel.org>
Link: http://lkml.kernel.org/r/20200304022058.248270-1-shakeelb@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-03 20:09:42 -07:00
..
kasan
kasan: move kasan_report() into report.c
2020-06-02 10:59:12 -07:00
backing-dev.c
bdi: remove the name field in struct backing_dev_info
2020-05-09 16:15:13 -06:00
balloon_compaction.c
mm/balloon_compaction: suppress allocation warnings
2019-09-04 07:42:01 -04:00
cleancache.c
Driver Core and debugfs changes for 5.3-rc1
2019-07-12 12:24:03 -07:00
cma_debug.c
mm/cma_debug.c: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
cma.c
mm: cma: NUMA node interface
2020-04-10 15:36:21 -07:00
cma.h
…
compaction.c
mm/swap: Use local_lock for protection
2020-05-28 10:31:10 +02:00
debug_page_ref.c
…
debug.c
mm, dump_page(): do not crash with invalid mapping pointer
2020-06-02 10:59:06 -07:00
dmapool.c
mm/dmapool.c: micro-optimisation remove unnecessary branch
2020-04-07 10:43:42 -07:00
early_ioremap.c
mm/early_ioremap.c: use %pa to print resource_size_t variables
2020-01-31 10:30:38 -08:00
fadvise.c
mm: return void from various readahead functions
2020-06-02 10:59:06 -07:00
failslab.c
mm/failslab.c: by default, do not fail allocations with direct reclaim only
2019-07-12 11:05:43 -07:00
filemap.c
for-5.8-tag
2020-06-02 19:59:25 -07:00
frame_vector.c
mm: untag user pointers in get_vaddr_frames
2019-09-25 17:51:41 -07:00
frontswap.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
2019-06-19 17:09:52 +02:00
gup_benchmark.c
mm/gup_benchmark: support pin_user_pages() and related calls
2020-04-02 09:35:27 -07:00
gup.c
Merge branch 'akpm' (patches from Andrew)
2020-06-02 12:21:36 -07:00
highmem.c
mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions
2019-12-10 10:12:55 +01:00
hmm.c
mm/hmm: remove the customizable pfn format from hmm_range_fault
2020-05-11 10:47:29 -03:00
huge_memory.c
gup: document and work around "COW can break either way" issue
2020-06-02 10:19:17 -07:00
hugetlb_cgroup.c
mm: use fallthrough;
2020-04-07 10:43:41 -07:00
hugetlb.c
mm/hugetlb: fix a addressing exception caused by huge_pte_offset
2020-04-21 11:11:55 -07:00
hwpoison-inject.c
mm/hwpoison-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
init-mm.c
mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch
2019-10-19 06:32:32 -04:00
internal.h
mm: return void from various readahead functions
2020-06-02 10:59:06 -07:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
Kconfig
mm: only allow page table mappings for built-in zsmalloc
2020-06-02 10:59:10 -07:00
Kconfig.debug
mm: add generic ptdump
2020-02-04 03:05:25 +00:00
khugepaged.c
mm,thp: stop leaking unreleased file pages
2020-05-28 11:35:40 -07:00
kmemleak-test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
kmemleak.c
mm/kmemleak.c: use address-of operator on section symbols
2020-04-02 09:35:26 -07:00
ksm.c
mm/ksm: fix NULL pointer dereference when KSM zero page is enabled
2020-04-21 11:11:55 -07:00
list_lru.c
mm: use fallthrough;
2020-04-07 10:43:41 -07:00
maccess.c
uaccess: Add strict non-pagefault kernel-space read function
2019-11-02 12:39:12 -07:00
madvise.c
mm: check that mm is still valid in madvise()
2020-04-24 13:28:03 -07:00
Makefile
mm: introduce Reported pages
2020-04-07 10:43:38 -07:00
mapping_dirty_helpers.c
mm/mapping_dirty_helpers: update huge page-table entry callbacks
2020-04-02 09:35:29 -07:00
memblock.c
mm: cma: NUMA node interface
2020-04-10 15:36:21 -07:00
memcontrol.c
mm/memcg: optimize memory.numa_stat like memory.stat
2020-06-03 20:09:42 -07:00
memfd.c
mm: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
memory_hotplug.c
mm/memory_hotplug: add pgprot_t to mhp_params
2020-04-10 15:36:21 -07:00
memory-failure.c
ACPI updates for 5.8-rc1
2020-06-02 13:25:52 -07:00
memory.c
mm/memory: remove unnecessary pte_devmap case in copy_one_pte()
2020-06-02 10:59:10 -07:00
mempolicy.c
libnvdimm for 5.7
2020-04-08 21:03:40 -07:00
mempool.c
docs/core-api/mm: fix return value descriptions in mm/
2019-03-05 21:07:20 -08:00
memremap.c
mm/memremap: set caching mode for PCI P2PDMA memory to WC
2020-04-10 15:36:21 -07:00
memtest.c
…
migrate.c
mm/migrate.c: attach_page_private already does the get_page
2020-06-02 15:19:42 -07:00
mincore.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
mlock.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
mm_init.c
mm/mm_init.c: report kasan-tag information stored in page->flags
2020-06-02 10:59:12 -07:00
mmap.c
mm/vma: introduce VM_ACCESS_FLAGS
2020-04-10 15:36:21 -07:00
mmu_context.c
…
mmu_gather.c
asm-generic/tlb: provide MMU_GATHER_TABLE_FREE
2020-02-04 03:05:26 +00:00
mmu_notifier.c
mm/mmu_notifier: silence PROVE_RCU_LIST warnings
2020-03-21 18:56:06 -07:00
mmzone.c
…
mprotect.c
mm/vma: introduce VM_ACCESS_FLAGS
2020-04-10 15:36:21 -07:00
mremap.c
userfaultfd: fix remap event with MREMAP_DONTUNMAP
2020-05-14 10:00:35 -07:00
msync.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
nommu.c
mm: remove vmalloc_sync_(un)mappings()
2020-06-02 10:59:12 -07:00
oom_kill.c
mm, oom: dump stack of victim when reaping failed
2020-01-31 10:30:38 -08:00
page_alloc.c
Merge branch 'akpm' (patches from Andrew)
2020-06-02 12:21:36 -07:00
page_counter.c
mm, memcg: prevent memory.min load/store tearing
2020-04-02 09:35:29 -07:00
page_ext.c
mm/page_ext.c: drop pfn_present() check when onlining
2020-04-07 10:43:40 -07:00
page_idle.c
mm/page_idle.c: fix oops because end_pfn is larger than max_pfn
2019-06-29 16:43:45 +08:00
page_io.c
fs: Enable bmap() function to properly return errors
2020-02-03 08:05:37 -05:00
page_isolation.c
mm: add function __putback_isolated_page
2020-04-07 10:43:38 -07:00
page_owner.c
mm/page_owner: don't access uninitialized memmaps when reading /proc/pagetypeinfo
2019-10-19 06:32:31 -04:00
page_poison.c
mm/page_poison.c: fix a typo in a comment
2019-09-24 15:54:08 -07:00
page_reporting.c
mm/page_reporting: add budget limit on how many pages can be reported per pass
2020-04-07 10:43:39 -07:00
page_reporting.h
mm: introduce Reported pages
2020-04-07 10:43:38 -07:00
page_vma_mapped.c
mm/page_vma_mapped.c: explicitly compare pfn for normal, hugetlbfs and THP page
2020-01-31 10:30:38 -08:00
page-writeback.c
mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead
2020-06-02 10:59:08 -07:00
pagewalk.c
x86: mm: avoid allocating struct mm_struct on the stack
2020-02-04 03:05:25 +00:00
percpu-internal.h
percpu: convert chunk hints to be based on pcpu_block_md
2019-03-13 12:25:31 -07:00
percpu-km.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu-stats.c
percpu: update copyright emails to dennis@kernel.org
2020-04-01 10:09:12 -07:00
percpu-vm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu.c
mm: remove the pgprot argument to __vmalloc
2020-06-02 10:59:11 -07:00
pgtable-generic.c
asm-generic/mm: stub out p{4,u}d_clear_bad() if __PAGETABLE_P{4,U}D_FOLDED
2019-12-01 06:29:19 -08:00
process_vm_access.c
mm: docs: Fix a comment in process_vm_rw_core
2020-03-25 10:04:01 -05:00
ptdump.c
x86: mm: ptdump: calculate effective permissions correctly
2020-06-02 10:59:09 -07:00
readahead.c
mm: use memalloc_nofs_save in readahead path
2020-06-02 10:59:07 -07:00
rmap.c
mm: prevent a warning when casting void* -> enum
2020-04-07 10:43:41 -07:00
rodata_test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
2019-06-05 17:37:17 +02:00
shmem.c
mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path
2020-04-21 11:11:56 -07:00
shuffle.c
mm: adjust shuffle code to allow for future coalescing
2020-04-07 10:43:38 -07:00
shuffle.h
mm: adjust shuffle code to allow for future coalescing
2020-04-07 10:43:38 -07:00
slab_common.c
usercopy: mark dma-kmalloc caches as usercopy caches
2020-06-02 10:59:06 -07:00
slab.c
mm, debug_pagealloc: don't rely on static keys too early
2020-01-13 18:19:02 -08:00
slab.h
mm: kmem: rename (__)memcg_kmem_(un)charge_memcg() to __memcg_kmem_(un)charge()
2020-04-02 09:35:28 -07:00
slob.c
mm/sl[uo]b: export __kmalloc_track(_node)_caller
2020-03-26 14:45:51 +01:00
slub.c
mm/slub: fix a memory leak in sysfs_slab_add()
2020-06-03 20:09:42 -07:00
sparse-vmemmap.c
mm/sparsemem: convert kmalloc_section_memmap() to populate_section_memmap()
2019-07-18 17:08:07 -07:00
sparse.c
mm/sparse.c: move subsection_map related functions together
2020-04-07 10:43:40 -07:00
swap_cgroup.c
…
swap_slots.c
mm/swap_slots.c: assign|reset cache slot by value directly
2020-04-02 09:35:27 -07:00
swap_state.c
mm/swap_state: fix a data race in swapin_nr_pages
2020-06-02 10:59:08 -07:00
swap.c
mm/swap: Use local_lock for protection
2020-05-28 10:31:10 +02:00
swapfile.c
mm: swapfile: fix /proc/swaps heading and Size/Used/Priority alignment
2020-06-02 10:59:09 -07:00
truncate.c
mm/thp: allow dropping THP from page cache
2019-10-19 06:32:33 -04:00
usercopy.c
usercopy: Avoid HIGHMEM pfn warning
2019-09-17 15:20:17 -07:00
userfaultfd.c
userfaultfd: wp: support write protection for userfault vma range
2020-04-07 10:43:39 -07:00
util.c
mm: remove __vmalloc_node_flags_caller
2020-06-02 10:59:11 -07:00
vmacache.c
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
vmalloc.c
mm: remove vmalloc_sync_(un)mappings()
2020-06-02 10:59:12 -07:00
vmpressure.c
mm: vmpressure: use mem_cgroup_is_root API
2020-04-02 09:35:31 -07:00
vmscan.c
mm/writeback: replace PF_LESS_THROTTLE with PF_LOCAL_THROTTLE
2020-06-02 10:59:08 -07:00
vmstat.c
Merge branch 'akpm' (patches from Andrew)
2020-06-02 12:21:36 -07:00
workingset.c
mm: vmscan: detect file thrashing at the reclaim root
2019-12-01 12:59:07 -08:00
z3fold.c
mm/z3fold: silence kmemleak false positives of slots
2020-05-28 11:35:40 -07:00
zbud.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
zpool.c
zpool: add malloc_support_movable to zpool_driver
2019-09-24 15:54:12 -07:00
zsmalloc.c
mm: remove map_vm_range
2020-06-02 10:59:11 -07:00
zswap.c
mm/zswap: allow setting default status, compressor and allocator in Kconfig
2020-04-07 10:43:41 -07:00