Marek Szyprowski 1ca7554d05 mm/thp: decrease nr_thps in file's mapping on THP split ... Decrease nr_thps counter in file's mapping to ensure that the page cache won't be dropped excessively on file write access if page has been already split. I've tried a test scenario running a big binary, kernel remaps it with THPs, then force a THP split with /sys/kernel/debug/split_huge_pages. During any further open of that binary with O_RDWR or O_WRITEONLY kernel drops page cache for it, because of non-zero thps counter. Link: https://lkml.kernel.org/r/20211012120237.2600-1-m.szyprowski@samsung.com Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Fixes: 09d91cda0e ("mm,thp: avoid writes to file with THP in pagecache") Fixes: 06d3eff62d ("mm/thp: fix node page state in split_huge_page_to_list()") Acked-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: <sfoon.kim@samsung.com> Cc: Song Liu <songliubraving@fb.com> Cc: Rik van Riel <riel@surriel.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Hillf Danton <hdanton@sina.com> Cc: Hugh Dickins <hughd@google.com> Cc: William Kucharski <william.kucharski@oracle.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2021-10-18 20:22:03 -10:00
..
damon	mm/damon: don't use strnlen() with known-bogus source length	2021-09-24 16:13:34 -07:00
kasan	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
kfence	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
Kconfig	mm/idle_page_tracking: make PG_idle reusable	2021-09-08 11:50:24 -07:00
Kconfig.debug	…
Makefile	mm: introduce Data Access MONitor (DAMON)	2021-09-08 11:50:24 -07:00
backing-dev.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
balloon_compaction.c	…
bootmem_info.c	mm/bootmem_info.c: mark __init on register_page_bootmem_info_section	2021-09-03 09:58:14 -07:00
cleancache.c	…
cma.c	…
cma.h	…
cma_debug.c	…
cma_sysfs.c	…
compaction.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
debug.c	mm/debug: sync up latest migrate_reason to migrate_reason_names	2021-09-24 16:13:35 -07:00
debug_page_ref.c	…
debug_vm_pgtable.c	mm/debug_vm_pgtable: fix corrupted page flag	2021-09-03 09:58:10 -07:00
dmapool.c	…
early_ioremap.c	mm/early_ioremap.c: remove redundant early_ioremap_shutdown()	2021-09-08 11:50:24 -07:00
fadvise.c	…
failslab.c	…
filemap.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
frontswap.c	…
gup.c	Revert "mm/gup: remove try_get_page(), call try_get_compound_head() directly"	2021-09-07 11:03:45 -07:00
gup_test.c	…
gup_test.h	…
highmem.c	mm: in_irq() cleanup	2021-09-08 11:50:24 -07:00
hmm.c	mm/hmm: bypass devmap pte when all pfn requested flags are fulfilled	2021-09-08 18:45:52 -07:00
huge_memory.c	mm/thp: decrease nr_thps in file's mapping on THP split	2021-10-18 20:22:03 -10:00
hugetlb.c	mm/hugetlb: add support for mempolicy MPOL_PREFERRED_MANY	2021-09-03 09:58:17 -07:00
hugetlb_cgroup.c	…
hugetlb_vmemmap.c	…
hugetlb_vmemmap.h	…
hwpoison-inject.c	mm: hwpoison: don't drop slab caches for offlining non-LRU page	2021-09-03 09:58:15 -07:00
init-mm.c	…
internal.h	mm/numa: automatically generate node migration order	2021-09-03 09:58:16 -07:00
interval_tree.c	…
io-mapping.c	…
ioremap.c	mm: move ioremap_page_range to vmalloc.c	2021-09-08 11:50:24 -07:00
khugepaged.c	huge tmpfs: SGP_NOALLOC to stop collapse_file() on race	2021-09-03 09:58:12 -07:00
kmemleak.c	mm/kmemleak: allow __GFP_NOLOCKDEP passed to kmemleak's gfp	2021-09-08 18:45:53 -07:00
ksm.c	mm/ksm: remove old GCC 4.9+ check	2021-09-13 10:18:28 -07:00
list_lru.c	…
maccess.c	…
madvise.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
mapping_dirty_helpers.c	…
memblock.c	memblock: check memory total_size	2021-10-18 20:22:03 -10:00
memcontrol.c	memcg: flush lruvec stats in the refault	2021-09-23 10:09:13 -07:00
memfd.c	…
memory-failure.c	mm/memory_failure: fix the missing pte_unmap() call	2021-09-24 16:13:35 -07:00
memory.c	afs: Fix mmap coherency vs 3rd-party changes	2021-09-13 09:10:39 +01:00
memory_hotplug.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
mempolicy.c	mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()	2021-10-18 20:22:03 -10:00
mempool.c	…
memremap.c	mm/memory_hotplug: remove nid parameter from arch_remove_memory()	2021-09-08 11:50:23 -07:00
memtest.c	…
migrate.c	mm/migrate: fix CPUHP state to update node demotion order	2021-10-18 20:22:03 -10:00
mincore.c	…
mlock.c	…
mm_init.c	…
mmap.c	Merge tag 'denywrite-for-5.15' of git://github.com/davidhildenbrand/linux	2021-09-04 11:35:47 -07:00
mmap_lock.c	…
mmu_gather.c	…
mmu_notifier.c	…
mmzone.c	…
mprotect.c	…
mremap.c	mm/mremap: fix memory account on do_munmap() failure	2021-09-03 09:58:14 -07:00
msync.c	…
nommu.c	Merge tag 'denywrite-for-5.15' of git://github.com/davidhildenbrand/linux	2021-09-04 11:35:47 -07:00
oom_kill.c	mm: introduce process_mrelease system call	2021-09-03 09:58:17 -07:00
page-writeback.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
page_alloc.c	mm/page_alloc.c: avoid accessing uninitialized pcp page migratetype	2021-09-08 18:45:53 -07:00
page_counter.c	…
page_ext.c	mm/migrate: add CPU hotplug to demotion #ifdef	2021-10-18 20:22:02 -10:00
page_idle.c	mm/idle_page_tracking: make PG_idle reusable	2021-09-08 11:50:24 -07:00
page_io.c	…
page_isolation.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
page_owner.c	mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE	2021-09-08 11:50:22 -07:00
page_poison.c	…
page_reporting.c	…
page_reporting.h	…
page_vma_mapped.c	…
pagewalk.c	…
percpu-internal.h	…
percpu-km.c	…
percpu-stats.c	…
percpu-vm.c	…
percpu.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
pgalloc-track.h	…
pgtable-generic.c	…
process_vm_access.c	…
ptdump.c	…
readahead.c	…
rmap.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
rodata_test.c	…
secretmem.c	mm/secretmem: use refcount_t instead of atomic_t	2021-09-08 11:50:24 -07:00
shmem.c	mm/shmem.c: fix judgment error in shmem_is_huge()	2021-09-24 16:13:34 -07:00
shuffle.c	…
shuffle.h	…
slab.c	mm/migrate: add CPU hotplug to demotion #ifdef	2021-10-18 20:22:02 -10:00
slab.h	…
slab_common.c	mm: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context	2021-09-04 01:12:23 +02:00
slob.c	…
slub.c	mm, slub: fix incorrect memcg slab count for bulk free	2021-10-18 20:22:03 -10:00
sparse-vmemmap.c	…
sparse.c	mm: introduce memmap_alloc() to unify memory map allocation	2021-09-03 09:58:15 -07:00
swap.c	mm: fs: invalidate bh_lrus for only cold path	2021-09-24 16:13:35 -07:00
swap_cgroup.c	…
swap_slots.c	…
swap_state.c	…
swapfile.c	mm, memcg: inline swap-related functions to improve disabled memcg config	2021-09-03 09:58:12 -07:00
truncate.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
usercopy.c	…
userfaultfd.c	userfaultfd: change mmap_changing to atomic	2021-09-03 09:58:16 -07:00
util.c	mm: fix uninitialized use in overcommit_policy_handler	2021-09-24 16:13:35 -07:00
vmacache.c	…
vmalloc.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
vmpressure.c	mm/vmpressure: replace vmpressure_to_css() with vmpressure_to_memcg()	2021-09-03 09:58:17 -07:00
vmscan.c	mm,vmscan: fix divide by zero in get_scan_count	2021-09-08 18:45:53 -07:00
vmstat.c	mm/vmstat: protect per cpu variables with preempt disable on RT	2021-09-08 15:32:34 -07:00
workingset.c	memcg: flush lruvec stats in the refault	2021-09-23 10:09:13 -07:00
z3fold.c	…
zbud.c	…
zpool.c	…
zsmalloc.c	…
zswap.c	…