android/android_kernel_samsung_sm8650
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
1537dbe21b
android_kernel_samsung_sm8650/mm
History
Kalesh Singh 1537dbe21b ANDROID: 16K: Exclude ELF padding for fault around range 
Userspace apps often analyze memory consumption by the use of mm
rss_stat counters -- via the kmem/rss_stat trace event or from
/proc/<pid>/statm.

rss_stat counters are only updated when the PTEs are updated. What this
means is that pages can be present in the page cache from readahead but
not visible to userspace (not attributed to the app) as there is no
corresponding VMA (PTEs) for the respective page cache pages.

A side effect of the loader now extending ELF LOAD segments to be
contiguously mapped in the virtual address space, means that the VMA is
extended to cover the padding pages.

When filesystems, such as f2fs and ext4, that implement
vm_ops->map_pages() attempt to perform a do_fault_around() the extent of
the fault around is restricted by the area of the enclosing VMA. Since
the loader extends LOAD segment VMAs to be contiguously mapped, the extent
of the fault around is also increased. The result of which, is that the
PTEs corresponding to the padding pages are updated and reflected in the
rss_stat counters.

It is not common that userspace application developers be aware of this
nuance in the kernel's memory accounting. To avoid apparent regressions
in memory usage to userspace, restrict the fault around range to only
valid data pages (i.e. exclude the padding pages at the end of the VMA).

Bug: 330117029
Bug: 327600007
Bug: 330767927
Bug: 328266487
Bug: 329803029
Change-Id: I2c7a39ec1b040be2b9fb47801f95042f5dbf869d
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
2024-05-02 22:14:25 +00:00
..
damon Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
kasan Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
kfence mm,kfence: decouple kfence from page granularity mapping judgement 2023-12-03 07:32:08 +01:00
kmsan UPSTREAM: mm: kmsan: handle alloc failures in kmsan_vmap_pages_range_noflush() 2023-05-31 15:20:12 +00:00
backing-dev.c writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs 2023-04-26 14:28:39 +02:00
balloon_compaction.c mm: Convert all PageMovable users to movable_operations 2022-08-02 12:34:03 -04:00
bootmem_info.c bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem 2022-08-28 14:02:45 -07:00
cleancache.c ANDROID: Revert "mm: remove cleancache" 2023-04-26 17:01:50 +00:00
cma_debug.c mm/cma_debug: show complete cma name in debugfs directories 2022-09-11 20:25:50 -07:00
cma_sysfs.c
cma.c ANDROID: vendor_hooks: Export cma_alloc trace points 2024-03-08 04:04:18 +00:00
cma.h mm/cma: provide option to opt out from exposing pages on activation failure 2022-03-22 15:57:09 -07:00
compaction.c ANDROID: mm: vh for compaction begin/end 2023-10-17 18:15:01 +00:00
debug_page_ref.c
debug_vm_pgtable.c docs: rename Documentation/vm to Documentation/mm 2022-06-27 12:52:53 -07:00
debug.c UPSTREAM: mm: export dump_mm() 2023-06-07 14:24:58 +00:00
dmapool.c
early_ioremap.c mm/early_ioremap: declare early_memremap_pgprot_adjust() 2022-03-22 15:57:11 -07:00
fadvise.c UPSTREAM: mm: support POSIX_FADV_NOREUSE 2023-04-12 16:02:15 +00:00
failslab.c mm: fix unexpected changes to {failslab|fail_page_alloc}.attr 2022-11-22 18:50:44 -08:00
filemap.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
folio-compat.c mm: remove try_to_free_swap() 2022-10-03 14:02:53 -07:00
frontswap.c frontswap: don't call ->init if no ops are registered 2022-09-26 12:14:34 -07:00
gup_test.c mm: rename is_pinnable_page() to is_longterm_pinnable_page() 2022-07-17 17:14:27 -07:00
gup_test.h
gup.c BACKPORT: mm: always expand the stack with the mmap write lock held 2023-07-27 11:47:21 +00:00
highmem.c highmem: fix kmap_to_page() for kmap_local_page() addresses 2022-10-12 18:51:51 -07:00
hmm.c BACKPORT: FROMGIT: mm: enable page walking API to lock vmas during the walk 2023-08-16 16:55:02 +00:00
huge_memory.c BACKPORT: userfaultfd: use per-vma locks in userfaultfd operations 2024-04-22 18:09:14 +00:00
hugetlb_cgroup.c hugetlb_cgroup: use helper for_each_hstate and hstate_index 2022-09-11 20:25:53 -07:00
hugetlb_vmemmap.c mm: hugetlb_vmemmap: fix a race between vmemmap pmd split 2023-09-19 12:27:56 +02:00
hugetlb_vmemmap.h mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability 2022-08-08 18:06:43 -07:00
hugetlb.c This is the 6.1.68 stable release 2024-01-05 08:40:52 +00:00
hwpoison-inject.c mm/hwpoison: add __init/__exit annotations to module init/exit funcs 2022-10-03 14:03:05 -07:00
init-mm.c UPSTREAM: mm: add per-VMA lock and helper functions to control it 2023-06-07 14:24:59 +00:00
internal.h Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
interval_tree.c
io-mapping.c
ioremap.c mm: ioremap: Add ioremap/iounmap_allowed() 2022-06-27 12:22:31 +01:00
Kconfig BACKPORT: mm: introduce new 'lock_mm_and_find_vma()' page fault helper 2023-07-26 09:57:34 +00:00
Kconfig.debug Merge 6.1.34 into android14-6.1-lts 2023-06-14 19:49:28 +00:00
khugepaged.c BACKPORT: userfaultfd: UFFDIO_MOVE uABI 2024-04-22 18:09:14 +00:00
kmemleak.c BACKPORT: mm/kmemleak: fix UAF bug in kmemleak_scan() 2023-05-15 19:08:33 +00:00
ksm.c BACKPORT: FROMGIT: mm: enable page walking API to lock vmas during the walk 2023-08-16 16:55:02 +00:00
list_lru.c mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe 2022-06-16 19:48:31 -07:00
maccess.c mm: Fix copy_from_user_nofault(). 2023-06-28 11:12:17 +02:00
madvise.c ANDROID: 16K: Use MADV_DONTNEED to save VMA padding pages. 2024-05-02 22:14:25 +00:00
Makefile ANDROID: 16K: Introduce /sys/kernel/mm/pgsize_miration/enabled 2024-05-02 22:14:25 +00:00
mapping_dirty_helpers.c
memblock.c ANDROID: GKI: Export memblock_free to drivers 2023-03-01 21:29:20 +00:00
memcontrol.c FROMGIT: mm: memcg: don't periodically flush stats when memcg is disabled 2024-01-30 20:40:37 +00:00
memfd.c memfd: check for non-NULL file_seals in memfd_create() syscall 2023-06-28 11:12:27 +02:00
memory_hotplug.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
memory-failure.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
memory-tiers.c memory tier: release the new_memtier in find_create_memory_tier() 2023-03-10 09:34:27 +01:00
memory.c ANDROID: 16K: Exclude ELF padding for fault around range 2024-05-02 22:14:25 +00:00
mempolicy.c Merge 6.1.62 into android14-6.1-lts 2023-11-27 14:58:20 +00:00
mempool.c mm/mempool: use might_alloc() 2022-06-16 19:48:30 -07:00
memremap.c UPSTREAM: mm: introduce __vm_flags_mod and use it in untrack_pfn 2023-06-07 14:24:58 +00:00
memtest.c
migrate_device.c BACKPORT: FROMGIT: mm: enable page walking API to lock vmas during the walk 2023-08-16 16:55:02 +00:00
migrate.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
mincore.c BACKPORT: FROMGIT: mm: enable page walking API to lock vmas during the walk 2023-08-16 16:55:02 +00:00
mlock.c FROMGIT: mm: lock vma explicitly before doing vm_flags_reset and vm_flags_reset_once 2023-08-16 16:55:02 +00:00
mm_init.c mm: multi-gen LRU: groundwork 2022-09-26 19:46:09 -07:00
mm_slot.h mm: introduce common struct mm_slot 2022-10-03 14:02:43 -07:00
mmap_lock.c
mmap.c Merge branch 'android14-6.1' into branch 'android14-6.1-lts' 2024-01-11 08:06:52 +00:00
mmu_gather.c mm/khugepaged: fix GUP-fast interaction by sending IPI 2022-11-30 14:49:42 -08:00
mmu_notifier.c mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove() 2022-04-21 20:01:10 -07:00
mmzone.c ANDROID: mm: Create hooks for ZONE_MOVABLE allocs 2023-04-26 17:01:52 +00:00
mprotect.c FROMGIT: mm: lock vma explicitly before doing vm_flags_reset and vm_flags_reset_once 2023-08-16 16:55:02 +00:00
mremap.c UPSTREAM: mm/mremap: write-lock VMA while remapping it to a new address range 2023-06-07 14:25:00 +00:00
msync.c mm/msync: use vma_find() instead of vma linked list 2022-09-26 19:46:25 -07:00
nommu.c BACKPORT: mm: always expand the stack with the mmap write lock held 2023-07-27 11:47:21 +00:00
oom_kill.c BACKPORT: mm: update mark_victim tracepoints fields 2024-04-08 18:00:16 +00:00
page_alloc.c ANDROID: add reclaim tune parameter functions 2024-04-08 17:39:38 +00:00
page_counter.c mm: page_counter: remove unneeded atomic ops for low/min 2022-09-11 20:26:01 -07:00
page_ext.c ANDROID: mm: introduce page_pinner 2023-05-16 21:34:27 +00:00
page_idle.c mm: don't be stuck to rmap lock on reclaim path 2022-05-19 14:08:54 -07:00
page_io.c use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
page_isolation.c BACKPORT: FROMGIT: mm: add alloc_contig_migrate_range allocation statistics 2024-03-13 16:15:27 +00:00
page_owner.c ANDROID: mm: Export page_owner_inited and __set_page_owner 2023-08-29 23:06:13 +00:00
page_pinner.c ANDROID: page_pinner: add missing page_pinner_put_page 2023-05-16 21:34:27 +00:00
page_poison.c
page_reporting.c ANDROID: KVM: arm64: balloon: Notify hyp before reporting free pages to host 2022-12-15 16:13:01 +00:00
page_reporting.h
page_table_check.c mm: page_table_check: Ensure user pages are not slab pages 2023-06-14 11:15:29 +02:00
page_vma_mapped.c mm/swap: add swp_offset_pfn() to fetch PFN from swap entry 2022-09-26 19:46:05 -07:00
page-writeback.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
pagewalk.c BACKPORT: FROMGIT: mm: enable page walking API to lock vmas during the walk 2023-08-16 16:55:02 +00:00
percpu-internal.h percpu: improve percpu_alloc_percpu event trace 2022-05-13 07:20:18 -07:00
percpu-km.c
percpu-stats.c mm: use vmalloc_array and vcalloc for array allocations 2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu.c ANDROID: mm: Export pcpu_nr_pages 2023-03-23 18:20:34 +00:00
pgalloc-track.h
pgsize_migration.c ANDROID: 16K: Use MADV_DONTNEED to save VMA padding pages. 2024-05-02 22:14:25 +00:00
pgtable-generic.c mm: avoid unnecessary flush on change_huge_pmd() 2022-05-13 07:20:05 -07:00
process_vm_access.c use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
ptdump.c mm: pagewalk: Fix race between unmap and page walker 2022-09-03 10:13:13 -07:00
readahead.c Merge "Merge tag 'android14-6.1.68_r00' into branch 'android14-6.1'" into android14-6.1 2024-01-24 17:34:59 +00:00
rmap.c BACKPORT: userfaultfd: UFFDIO_MOVE uABI 2024-04-22 18:09:14 +00:00
rodata_test.c mm/rodata_test: use PAGE_ALIGNED() helper 2022-10-03 14:03:05 -07:00
secretmem.c UPSTREAM: mm: replace vma->vm_flags direct modifications with modifier calls 2023-06-07 14:24:57 +00:00
shmem.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
shrinker_debug.c mm: shrinkers: fix deadlock in shrinker debugfs 2023-02-22 12:59:46 +01:00
shuffle.c mm/shuffle: convert module_param_call to module_param_cb 2022-10-03 14:03:07 -07:00
shuffle.h
slab_common.c ANDROID: vendor_hooks: mm: add hook to count the number pages 2023-11-30 18:19:39 +00:00
slab.c Merge 6.1.22 into android14-6.1 2023-03-31 08:15:39 +00:00
slab.h ANDROID: mm: add get_each_object_track function 2023-03-23 18:21:15 +00:00
slob.c Merge branch 'slab/for-6.1/kmalloc_size_roundup' into slab/for-next 2022-09-29 11:30:55 +02:00
slub.c ANDROID: vendor_hooks: mm: add hook to count the number pages 2023-11-14 23:07:42 +00:00
sparse-vmemmap.c mm: hugetlb_vmemmap: move vmemmap code related to HugeTLB to hugetlb_vmemmap.c 2022-08-08 18:06:42 -07:00
sparse.c mm: memory_hotplug: enumerate all supported section flags 2022-07-03 18:08:49 -07:00
swap_cgroup.c mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled 2022-10-03 14:03:36 -07:00
swap_slots.c mm/swap: convert put_swap_page() to put_swap_folio() 2022-10-03 14:02:46 -07:00
swap_state.c FROMGIT: swap: remove remnants of polling from read_swap_cache_async 2023-07-19 18:48:39 +00:00
swap.c ANDROID: mm: lru_cache_disable skips lru cache drainnig 2023-12-06 18:54:20 +00:00
swap.h FROMGIT: swap: remove remnants of polling from read_swap_cache_async 2023-07-19 18:48:39 +00:00
swapfile.c ANDROID: vendor hooks: Add hooks to support bootloader based hibernation 2023-06-07 14:25:04 +00:00
truncate.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
usercopy.c mm: Fix copy_from_user_nofault(). 2023-06-28 11:12:17 +02:00
userfaultfd.c UPSTREAM: userfaultfd: fix deadlock warning when locking src and dst VMAs 2024-04-22 18:09:14 +00:00
util.c Merge tag 'android14-6.1.57_r00' into branch 'android14-6.1' 2023-11-27 16:18:59 +00:00
vmalloc.c This is the 6.1.53 stable release 2023-09-18 09:57:37 +00:00
vmpressure.c net-memcg: Fix scope of sockmem pressure indicators 2023-09-13 09:42:33 +02:00
vmscan.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
vmstat.c UPSTREAM: mm: introduce per-VMA lock statistics 2023-06-07 14:25:01 +00:00
workingset.c Reapply "Merge tag 'android14-6.1.75_r00' into android14-6.1" 2024-04-02 19:49:12 +00:00
z3fold.c mm: Convert all PageMovable users to movable_operations 2022-08-02 12:34:03 -04:00
zbud.c
zpool.c
zsmalloc.c Merge 6.1.47 into android14-6.1-lts 2023-09-13 19:35:46 +00:00
zswap.c zswap: do not shrink if cgroup may not zswap 2023-06-21 16:00:54 +02:00